Chapter 5: Third World Development
For almost the whole of human history, most people lived in the countryside. Fields, forests and grazing land were where the work was, and towns were the exception rather than the rule. That changed within the lifetime of your grandparents.
Demographers at the United Nations, who count and project the world’s population, had been watching two lines on the same graph for decades: the number of people living in rural areas, and the number living in towns and cities. Through the twentieth century the rural line rose slowly while the urban line climbed steeply. In the late 2000s the two lines crossed. For the first time on record, humanity had become more urban than rural.
No single event caused the crossing. It was the sum of millions of separate decisions — a farmer’s son taking a bus to a district town, a family moving to where a hospital and a school existed, a construction worker following the work. Most of that movement happened not in Europe or North America, which had urbanised long before, but in Asia, Africa and Latin America, where cities grew faster than the pipes, drains, buses and houses meant to serve them.
That gap — between the speed at which people arrive and the speed at which a city can build for them — is the subject of this chapter.
Diagram
Fig. 5.0-1 – two-line graph of world rural and urban population; x-axis year (1950 to 2050, projected portion dashed), y-axis population (billions); rural line rising slowly then flattening, urban line rising steeply; the crossing point in the late 2000s marked with a dot and labelled “urban population exceeds rural”
This chapter will answer each of these questions.
5.1 Urbanisation and the Rural–Urban Divide
5.1.1 What Urbanisation Means
Stand at a bus stand in any district town on a weekday morning and watch who gets off. Some passengers are coming in for a day — a court date, a hospital appointment, a wholesale purchase. Others are carrying a trunk and a bedroll. They are not visiting. They are moving.
Multiply that by a few decades and you have the process this chapter begins with. Urbanisation is the rise in the proportion of a country’s population that lives in towns and cities. It is a change in the share, not merely in the number.
That last phrase matters, and most students miss it. A country’s urban population can rise in three quite different ways, shown in Fig. 5.1-1. First, people move in from villages. Second, the people already in the city have children and live longer, so the urban population grows on its own — this is called natural increase. Third, a large village crosses whatever threshold of population, density and non-farm employment a government uses, and is simply reclassified as a town. Nobody moved; the boundary did.
Diagram
Fig. 5.1-1 – flow: rural-to-urban migration + natural increase within towns + reclassification and boundary expansion of settlements → growth of urban population → rise in urban share of total population (urbanisation)
It is worth separating two words that are often used as if they were the same. Urban growth is the increase in the absolute number of city dwellers. Urbanisation is the increase in their share of the whole population. A country can have rapid urban growth and slow urbanisation at the same time, if its rural population is also growing quickly.
The movement of people from one place to another with the intention of settling there, temporarily or permanently, is called migration. When it happens inside a country’s own borders — village to town, district to district, state to state — it is internal migration, and it is the kind that drives urbanisation in most of the developing world. Movement across national borders is external or international migration.
A note on the phrase used in this chapter’s title. Third world is a historical term that came out of the mid-twentieth century, when countries were grouped by their alignment during the Cold War; it later came to mean the poorer, largely formerly colonised countries of Asia, Africa and Latin America. It is the term the syllabus uses and so it is used here, but you should know that the more usual terms today are the developing world, low- and middle-income countries, or the Global South.
The rural–urban divide is the gap between village and city in incomes, wages, services, infrastructure and opportunity. Where the gap is wide, the pressure to move across it is strong. Migration, in this sense, is not a mystery to be explained by the character of the people who migrate. It is a rational response to a difference.
5.1.2 Push Factors
Push factors are the conditions in the place of origin that make staying difficult. They push people out.
Economic push. Landholdings divide with each generation, so a family farm that supported one household may support three badly. Returns from cultivation are uncertain, depending on rainfall, on pest years, and on prices at harvest. Farm work is also seasonal: in many parts of India there is intense demand for labour at sowing and harvest, and very little between. A worker with four idle months looks for those months elsewhere.
Environmental push. Repeated drought, a falling water table that dries up an open well, salinisation, riverbank erosion or a flood that takes a season’s crop can all end a household’s ability to farm. Environmental push is rarely dramatic. It is usually the slow arrival of a year when the borewell has to be deepened again and the money is not there.
Social and service push. A village without a secondary school sends its children to town; often, in time, the family follows. The same holds for a serious illness that needs a hospital rather than a clinic.
Forced displacement. Some movement is not chosen. A large irrigation or mining project, a disaster, or conflict can displace whole settlements. This is a distinct category, and the people involved are not migrants in the ordinary sense of the word — they did not weigh a decision.
5.1.3 Pull Factors
Pull factors are the attractions of the destination. Cities pull because they concentrate three things: wages, work of many kinds, and services.
The wage difference is the strongest single pull. A day’s unskilled work in a city typically pays more than a day’s agricultural work, and it pays through the year rather than in bursts. Even after allowing for higher rent and higher food costs, a remittance can still be sent home.
Cities also offer variety. A village economy may have three or four kinds of work; a city has hundreds, including work that needs almost no capital to enter — a vending cart, a cycle-rickshaw, a construction gang. This is the informal sector: the part of the economy made up of enterprises and jobs that are not registered, not covered by labour regulation, and not counted properly in official employment data. It is the entry door to city work for most new arrivals, and it is a door that stays open even when factories are not hiring.
Then come the services — schools, colleges, coaching, hospitals, courts, transport connections — and something less visible: networks. A worker who already has a cousin in a particular city knows where to sleep the first week and whom to ask about work. Migration follows established chains, which is why people from one district often cluster in one part of one distant city.
Diagram
Fig. 5.1-2 – push–pull model of migration; village on the left with outward arrows labelled small holdings, seasonal work, drought and falling water table, no secondary school; city on the right with inward arrows labelled higher wages, varied work, informal-sector entry, schools and hospitals, kin networks; a central arrow from village to city labelled “net migration”
Notice what the table does not say. It does not say that migrants are pulled by the bright lights, or pushed by any failing of their own. Both columns are made of structures — landholding size, rainfall, the location of a hospital, the wage gap. Change the structure and the flow changes.
5.1.4 Consequences for the Rural Sector
Migration reshapes the village that people leave, and the effects run in both directions.
Loss of working-age labour. Those who move are mostly young adults, and often men moving first. Villages are left with a higher proportion of children and older people. Where a great deal of male labour has gone, the share of farm work done by women rises sharply — sowing, weeding, harvesting and livestock care — usually in addition to their existing household responsibilities, and often without any corresponding gain in control over land or income.
Effects on cultivation. With fewer hands, some land is leased out, some is put under less labour-intensive crops, and some is left fallow. On the other hand, labour scarcity has pushed up rural wages in several regions and encouraged mechanisation, which raises output per worker.
Remittances. Money sent home by migrant workers is called a remittance, and for many households it is the single largest source of cash income. Remittances pay school fees, medical bills, wedding costs and debts; they also finance pump sets, house repairs and small shops. In parts of India, remittance income has done more to lift rural households above poverty than any change in farming itself.
Skills and ideas. Return migrants bring back trades learned elsewhere, contacts, and expectations about schooling and public services. This is a real but slow effect, easily overstated.
Decline of some rural crafts. Where cheap manufactured substitutes reach village markets and young workers leave, some artisan trades contract. This is not caused by migration alone; it is caused by competition, and migration is partly a response to it.
5.1.5 Consequences for the Urban Sector
Cities gain workers faster than they gain pipes. That single sentence explains most of what follows.
Housing and settlement. When formal housing is priced beyond what a new arrival can pay, people build or rent in informal settlements — a slum is an area of housing that lacks secure tenure, durable structures, adequate living space, safe water or sanitation, or some combination of these. Slums are not a stage people pass through by choice; they are what appears when land and housing markets exclude a large part of the workforce.
Water and sanitation. Piped supply and sewerage networks are expensive and slow to lay, and they are usually laid where land tenure is secure. Households outside the network buy from tankers or private vendors, often at a higher price per litre than metered households pay. This is a standing paradox of urban water: the poorest households frequently pay the most per unit.
Congestion and air quality. More people mean more trips. Where the road network and public transport do not expand with them, travel times lengthen and vehicle emissions concentrate along corridors where people also live and walk.
Pressure on services and land. Schools, clinics, drains and solid waste collection all stretch. City boundaries expand outward over farmland, orchards, wetlands and drainage channels — and building over a natural drainage channel is one of the commonest causes of urban flooding.
The gains, honestly stated. Cities are also where productivity is highest. Firms located near other firms, workers and customers gain from that proximity, and urban incomes are on average well above rural ones. Almost no country has become rich while remaining predominantly rural. The problem identified by the phrase urbanisation of poverty — the shift of a large share of a country’s poor population from villages into cities — is not that urbanisation is a mistake, but that the arrival of people has outpaced the building of the city.
5.1.6 Ways to Reduce Migration
Policies aimed at slowing rural-to-urban migration generally work on the push side, on the pull side, or on the route between them.
Raising rural incomes and reducing seasonality. Assured irrigation, credit at reasonable rates, storage that lets a farmer sell after the harvest glut, and guaranteed rural employment during the lean season all reduce the pressure to leave. Employment guarantee programmes have measurably reduced distress migration in the seasons in which they operate.
Rural non-farm employment. Since farmland cannot absorb an expanding workforce, the durable answer is work in villages and small towns that is not farming — food processing, repair, construction, transport, services.
Bringing services to people. A secondary school and a functioning health centre within reach remove one of the strongest social push factors.
Developing small and medium towns. If the only place with work is a distant metropolis, everyone goes there. Investment in intermediate towns gives a shorter, cheaper, less disruptive move — and spreads the environmental load across many settlements rather than concentrating it in a few.
Planning for the migration that will happen anyway. Land for affordable housing, transport that reaches the periphery, water and sanitation extended to unrecognised settlements.
It is worth being honest about the debate here. One view treats rural-to-urban migration as a problem to be reduced, because it strips villages of labour and overwhelms cities. Another view treats it as the ordinary mechanism by which workers move from low-productivity to higher-productivity work, and argues that restricting it keeps people poor; on this view the right target is not the movement but the city’s failure to build. The evidence supports parts of both: distress migration driven by drought and debt clearly reflects failure at the origin, while much other migration raises the incomes of those who move. What almost everyone agrees on is that migration undertaken as a genuine choice has better outcomes than migration undertaken to escape ruin.
5.1.7 Future Trends and Projections
Projections of urban population are made by taking the current urban and rural populations, applying expected rates of natural increase and net migration to each, and extending the result forward. They are estimates, and the further ahead they run the wider their margin of error — but the direction they give is consistent across every serious set of projections.
Read the table across, not down. The world’s urban share roughly doubles across the century covered. India’s rises more slowly and from a lower base, which means that India is expected to remain less urbanised than the world average even in 2050 — while still adding one of the largest absolute numbers of new city dwellers anywhere, because its total population is so large. A modest-looking change in a percentage, applied to a very large base, is an enormous change in people.
That distinction is worth working through with numbers.
Suppose a country of 100 crore people is 30 per cent urban, and thirty years later it has 130 crore people and is 45 per cent urban.
Urban population at the start:
\[U_1 = 0.30 \times 100 = 30 \text{ crore}\]
Urban population at the end:
\[U_2 = 0.45 \times 130 = 58.5 \text{ crore}\]
Increase in urban population:
\[\Delta U = U_2 - U_1 = 58.5 - 30 = 28.5 \text{ crore}\]
Percentage increase in the urban population:
\[\frac{\Delta U}{U_1} \times 100 = \frac{28.5}{30} \times 100 = 95\%\]
The urban share rose by 15 percentage points, which sounds moderate. The urban population nearly doubled — 28.5 crore additional people needing water, sewerage, transport, schools and housing within thirty years. This is why planners watch absolute numbers, not just shares: pipes and buses have to be built for people, not for percentages.
Two further trends are consistently projected. Almost all of the world’s urban growth over the next three decades is expected to occur in Asia and Africa. And a large part of it will occur not in the largest megacities but in small and medium towns, which typically have the weakest planning capacity, the smallest budgets and the least technical staff — the places least equipped to build ahead of arrival.
5.2 Development and the Conventional Paradigm
5.2.1 Defining Development
Two districts have the same average income. In the first, most children finish school, almost every household has piped water, and the nearest hospital is twenty minutes away. In the second, the income is earned mainly by a few large quarrying firms, half the children leave school early, and water comes by tanker. The two districts are equally rich. They are not equally developed.
Development is the process by which the conditions of life of a population improve — in income, but also in health, education, security, opportunity and the quality of the surroundings people live in. It is a wider idea than income alone, and every serious definition of it says so.
Set against it is a narrower and much more precisely measurable idea. Economic growth is the increase in the value of the goods and services an economy produces over a period, usually measured as the change in Gross Domestic Product (GDP) — the total money value of goods and services produced within a country in a year.
Growth and development are related but not identical, and the difference is the hinge on which this whole section turns.
5.2.2 How Development Became Synonymous with Growth
For most of the second half of the twentieth century, the standard measure of a country’s progress was the growth rate of its national income. This was not an accident, and it was not stupidity. It followed from three practical advantages.
First, GDP is a single number. A minister, a lender and a newspaper can all compare 6.1 with 4.3 without further argument. Second, it is comparable — the accounting conventions are broadly the same across countries, so rankings can be built. Third, it is available frequently, quarterly in many countries, while a measure of nutrition or literacy arrives once in several years.
A measure with those advantages becomes the target. Policies were designed to raise output; success was reported as output raised; and over time “development” in official language came to mean, in practice, “growth”. This is what the syllabus means by saying that development has become synonymous with growth, and it describes an approach that can fairly be called the conventional or growth-centred paradigm of development.
The critique of this paradigm is not that output does not matter. It is that a measure which was designed to count production has been asked to do a job it was never designed for — to say whether life is getting better.
Diagram
Fig. 5.2-1 – flow: policy goal set as maximum GDP growth → investment directed to high-output sectors → resource extraction and industrial output rise → environmental costs and distribution of gains are not recorded in the indicator → indicator reports success while resource stocks fall and access remains unequal
5.2.3 Environmental Impacts of Growth-Led Development
When growth is the target, six environmental consequences follow with some regularity. They are set out here in turn, with examples.
5.2.3.1 Ignoring Negative Environmental Impacts
Because GDP counts production but does not subtract the environmental damage caused in producing it, damage becomes invisible in the scorecard. Worse, some of the damage is counted twice as a positive: a factory pollutes a river, a treatment plant is built to clean it, and both the factory’s output and the plant’s construction add to GDP. Nothing anywhere records the river.
The practical result is that projects are appraised on their output and their cost, while the loss of a wetland that used to absorb floodwater, or of a mangrove belt that used to break storm surges, sits outside the calculation. These lost services are real and expensive to replace; they are simply not in the ledger.
5.2.3.2 Changing Patterns of Resource Use Due to Market Pressures
Where output for the market is the objective, the pattern of resource use shifts from what a locality needs to what sells. A mixed farm growing coarse grains, pulses and fodder for a household and its animals may be converted to a single crop grown for a distant buyer. A stretch of coast used for many kinds of small fishing is converted to ponds for a single high-value export species.
The shift can raise incomes substantially. It also changes the environmental profile of the land: a single crop grown continuously usually needs more purchased inputs, draws water on a different schedule, and leaves the household exposed to a price crash in one market rather than spread across several.
5.2.3.3 Overuse and Exploitation of Resources
If the rate at which a resource is used exceeds the rate at which it renews, the stock falls. Groundwater is the clearest Indian example. Where subsidised electricity, tubewell technology and a water-demanding crop combine, extraction can run for years above recharge, and the water table falls steadily. Every farmer’s individual decision is rational; the aggregate outcome is that wells must be deepened, pumping costs rise, and shallow wells — usually the poorer households’ wells — fail first.
The same logic applies to fish stocks harvested faster than they breed, to topsoil lost faster than it forms, and to forests cut faster than they regenerate.
5.2.3.4 Diversion of Scarce Resources to Luxury Goods
Markets allocate resources to whoever will pay most, which is not the same as allocating them to whoever needs them most. Where water is scarce, it may be piped to a resort, a golf course or a bottling operation while nearby households buy it in cans. Where land is scarce, it may be built on for premium housing while affordable housing is not built at all. Where electricity is short, it may run air conditioning in one part of a city while another part has an evening power cut.
This is not an accusation against any particular business; it is a straightforward description of how price rationing works when purchasing power is very unequal. It becomes an environmental issue because the scarce resource being diverted is often the one that was already under stress.
5.2.3.5 Disparate Access to Resources
Growth raises average income. Averages, however, conceal distribution, and the distribution of environmental goods is often more unequal than the distribution of income. Two households in the same city may face entirely different environments: one with a metered piped connection, an indoor toilet and a covered drain, the other buying water by the pot, using a shared facility and living beside an open drain.
The pattern extends beyond cities. When a river is dammed or a mine opened, the electricity and the ore go to distant users, while the displacement, the silt and the dust stay with the people nearest the site. Access to a resource and exposure to the cost of extracting it are frequently borne by different populations.
5.2.3.6 Increasing Wastes and Pollution
Higher output means more material flowing through the economy, and everything that flows in eventually flows out. Rising incomes shift consumption towards packaged goods, processed food and electronic products, which changes the composition of waste as well as its quantity — more plastic and multi-layer packaging, more metals, more items containing hazardous components, and less that will compost.
A festival week in any Indian town shows the mechanism in miniature: sales rise, and within days the volume at the collection point rises with them. The waste is not a separate problem from the growth. It is the same material, one stage later.
Diagram
Fig. 5.2-2 – two-line graph illustrating the divergence discussed in the text; x-axis time (years), y-axis index value (base year = 100); one solid line labelled “national output (GDP index)” rising steadily; one dashed line labelled “index of natural capital — forest area, groundwater level, fish stock” falling steadily; the widening gap between the two lines shaded and labelled “cost not recorded in the growth indicator”
5.2.4 A Critical Appraisal: Sustainability, Environmental Impact and Equity
The syllabus asks for the growth-centred paradigm to be appraised from three viewpoints. Take them one at a time, and give each side its due.
From the viewpoint of sustainability
The test of sustainability is whether the present pattern of production can continue without reducing the ability of future generations to meet their own needs. Growth measured as GDP does not apply this test, because it does not distinguish between income earned from the harvest of a renewable stock and income earned by liquidating the stock itself. A country that cuts its forests and sells the timber records a good year. On the accounts, it looks like a farmer selling a crop. In fact it is a farmer selling the field.
The counter-argument deserves a hearing. Growth also finances the things sustainability requires: sewage treatment, cleaner fuels, protected areas, monitoring networks and the scientific capacity to run them. Countries that stayed poor have not, on the whole, protected their environments better. The reply from critics is that this happens only when policy deliberately directs the proceeds of growth to those ends, and that nothing in the growth indicator itself creates that pressure.
From the viewpoint of environmental impact
Here the criticism is narrower and harder to dispute. The indicator is silent on depletion and on pollution; the six impacts set out in section 5.2.3 follow from that silence. What the criticism does not establish is that all growth carries the same environmental cost. A unit of output from a software firm and a unit from a coal-fired smelter contribute equally to GDP and very differently to the atmosphere. This matters, because it means the environmental problem is partly about the composition of growth and the technology used, not only about its rate.
From the viewpoint of equity
Equity asks two questions: who alive today gains and loses, and what is owed to those not yet born. Growth-centred development answers neither, since an average cannot show a distribution. A rising average is consistent with large gains for a few and none for many; it is also consistent with real gains for almost everybody. Only the distributional data can tell you which happened.
The defenders of the paradigm point to the historical record: over the past several decades the fall in the number of people living in extreme poverty has been very largely concentrated in countries with sustained rapid growth. That is a serious argument and it should not be waved away. Critics accept the record and make a different point — that the same growth has been accompanied by widening gaps within many of those countries, and by environmental costs that fall hardest on households with the least ability to avoid them: the settlement beside the drain, the field downstream of the effluent, the worker without a room with a window.
5.3 The Gandhian Approach to Development
5.3.1 Basic Principles Behind Village Policy
The paradigm examined in section 5.2 begins with a question about quantity: how fast can output rise? The approach taken up here begins with a different question: what kind of life is production for, and where should it happen?
Mahatma Gandhi (1869–1948) worked out an answer over some four decades of writing and public work in South Africa and India. It was never set out as a formal economic model, and it is better read as a set of connected principles than as a plan.
Decentralisation. Production, and the power to decide about production, should sit as close as possible to the people affected by it. Decentralisation — the distribution of decision-making authority away from a central body to local units — is the structural principle underlying everything else in the approach.
Limitation of wants. Needs can be met; wants can always expand. A pattern of life built on continually multiplying wants must draw continually more from nature. Restraint in consumption is therefore treated not as poverty but as a chosen discipline.
Dignity of labour and bread labour. Physical work is not a lesser activity, and every person should do some. This has an economic edge: a system that treats manual work as degrading will always seek to replace it, even where labour is the one resource in surplus.
Non-violence extended to means and to nature. Non-violence is applied not only to persons but to the way things are produced — a process that destroys the soil, the water or the health of the worker is treated as violent whatever it earns.
Trusteeship. Those who hold wealth should regard themselves as trustees holding it for the community rather than as absolute owners, using what they need and administering the rest for common benefit. Whether this is workable without legal compulsion has been debated ever since it was proposed; it is stated here as the principle it was intended to be.
5.3.2 Sarvodaya and Antyodaya
Two terms carry the ethical core of the approach, and they work as a pair.
Sarvodaya is a compound of sarva (all) and udaya (rise or uplift): the uplift of all. Gandhi adopted the word in 1908 as the title of his Gujarati rendering of a book by the English writer John Ruskin, and thereafter used it for his own social ideal. Its claim is that the welfare of every member of society is the object, not the welfare of the greatest number — a majority’s gain does not justify a minority’s loss.
Antyodaya joins antya (the last) and udaya (uplift): the uplift of the last person. It is the operating test for sarvodaya. Gandhi’s guidance to anyone framing a policy was to bring to mind the poorest and weakest person one had ever seen, and to ask whether the proposed step would be of any use to that person.
Put the two together and you have a distributional rule that behaves very differently from an average. An average income can rise while the last person is untouched. Under antyodaya, that outcome is a failure by definition, not an incidental shortcoming.
5.3.3 Panchayati Raj and Local Self-Governance
Panchayat comes from panch, five — historically, an assembly of respected village elders that settled disputes and managed common affairs. Gandhi proposed that this idea be rebuilt as the foundation of the country’s political system rather than left as a survival from the past. He used the term gram swaraj — village self-rule — for the resulting vision: a village managing its own affairs, with authority flowing upward from it rather than downward to it.
Panchayati Raj is the system of elected local self-government in rural India that gives institutional form to this idea. It operates in three tiers, shown in Fig. 5.3-1.
Diagram
Fig. 5.3-1 – three-tier structure of Panchayati Raj drawn as a pyramid with the Gram Sabha at the base; from base upward: Gram Sabha (all registered voters of the village) → Gram Panchayat (village level, elected) → Panchayat Samiti or block samiti (intermediate/block level) → Zila Parishad (district level); an upward arrow alongside labelled “authority flows upward from the village”
At the base is the Gram Sabha, which is not a committee but the whole body of registered voters of the village. Above it sits the elected Gram Panchayat at village level; then the Panchayat Samiti at block level, linking the villages of a block to the district administration; then the Zila Parishad at district level.
The environmental significance of this arrangement is easy to state and easy to underestimate. Decisions about a watershed, a village pond, a grazing common, a plantation or a drainage line are decisions where local knowledge is very good and distant knowledge is very poor. Whether a check dam should sit at one point on a stream or two hundred metres upstream is not a question an office in a state capital can answer well.
The reservation of a share of seats for women has changed who sits in these bodies, and studies of panchayat spending have found differences in priorities where women hold the presiding position — with drinking water and sanitation, in several studies, receiving greater attention. What decentralisation does not automatically produce is capacity: a panchayat with responsibilities, no technical staff and an uncertain budget cannot deliver them. Devolution of functions without devolution of funds and functionaries is the standard criticism of how the system has worked in practice.
5.3.4 Local Self-Sufficiency, Local Markets and Environmental Sustainability
Swadeshi — literally “of one’s own country”, and in practice the use of goods produced in one’s own locality — is the principle that a community should meet its needs as far as possible from what it can produce nearby, buying from a distance only what it genuinely cannot make.
The environmental logic of this is worth setting out plainly, because it is stronger than students often expect.
Transport energy. A good that travels fifteen kilometres carries a fraction of the fuel, emissions and packaging of the same good that travels fifteen hundred.
Materials. Local production tends to use locally available materials — clay, bamboo, stone, timber, cotton, cane — whose extraction is visible to the people who live with it. Damage that can be seen from the village tends to be limited by the village.
Closing the loop. In a local economy, organic residues stay local: crop residue and animal dung return to the same fields as manure, and food waste is consumed by animals. In a long-distance economy the nutrients leave with the produce and never come back, and must be replaced by purchased fertiliser at one end while accumulating as waste at the other.
Feedback. When production and consumption occupy the same place, the polluter and the person breathing the air are neighbours. Distance weakens the feedback that keeps damage in check.
Diagram
Fig. 5.3-2 – two contrasting material loops side by side; left, “local economy”: village fields → local processing → local consumption → crop residue, dung and food waste returned to fields (closed loop arrow); right, “long-distance economy”: village fields → distant processing → distant consumption → waste accumulating at the destination, with a separate inward arrow of purchased fertiliser returning to the fields (open, broken loop)
The honest limitation is equally important. A locality that produces only what it consumes forgoes the gains that come from specialising in what it does best and trading for the rest, and those gains are large; they are a principal reason incomes rise. A self-sufficient village is also fully exposed to its own bad year — a failed monsoon has no outside supply to offset it, which is precisely what long-distance grain movement is for. The strongest version of the argument today is therefore not autarky but proximity: produce locally where the transport, waste and feedback advantages are real, and trade where specialisation genuinely pays.
5.3.5 The Village as the Basis of Development
In this approach the village is not a residual category — the part of the country left over after the cities are counted. It is the basic unit: the place where most people live, where food is grown, and where development, if it is to reach everyone, has to begin.
Three arguments support the position. Most of the population was, and in many countries still is, rural, so a strategy that develops cities first postpones most people indefinitely. Second, a village-first strategy attacks the push factors of section 5.1.2 at their source, so the pressure to migrate falls rather than being managed after arrival. Third, dispersing production spreads its environmental load across many places instead of concentrating it where the air and water are already stressed.
The position was seriously contested at the time and has been ever since. Critics during the framing of the Constitution argued that the village was not the harmonious unit the vision assumed but a place of entrenched hierarchy and restricted freedom, from which movement to a town was for some people an escape; on this view, romanticising the village asks those with least standing in it to stay. A second objection is economic: farmland cannot absorb an endlessly growing workforce, so at some point non-farm work must expand, and non-farm work concentrates. Both objections are about facts, not sentiment, and neither is fully answered by the vision as originally stated.
5.3.6 Cottage Industries and Intermediate Technologies
A cottage industry is a small-scale enterprise carried on in or near the home, using simple equipment and largely family or local labour, with low capital investment per worker. Handloom weaving, pottery, oil pressing, cane and bamboo work, beekeeping, hand-made paper and food processing are typical examples.
Khadi — hand-spun and hand-woven cloth — became the emblem of the approach for a specific reason. Spinning and weaving could be done in a village with equipment a household could own, using a crop the village grew, converting idle time into cloth and income. It was, in the language of section 5.3.7, an employment technology rather than an output technology.
Gandhi founded the All India Village Industries Association in 1934 to work on exactly this problem: how to make village production viable rather than merely traditional. In independent India, the Khadi and Village Industries Commission was established as a statutory body to promote khadi and village industries, with the linked aims of providing rural employment, producing saleable goods, and building self-reliance in rural communities.
Intermediate technology is technology deliberately pitched between the simplest traditional tools and large-scale capital-intensive machinery — cheap enough for a small producer to buy, simple enough to maintain and repair locally, and productive enough to raise output substantially above hand methods. A pedal-operated or small motorised huller, an improved potter’s wheel, a small solar dryer and a treadle pump are standard examples. The term was introduced in the mid-1960s and popularised in the following decade by the economist E. F. Schumacher, whose argument for it drew explicitly on Gandhi.
The environmental case for intermediate technology is that it uses less energy and fewer imported materials per unit of output, is repairable rather than disposable, and fails gracefully — when a hand pump breaks the village can mend it, whereas when a large pumping station fails the whole settlement waits.
Read the last row honestly. Intermediate technology does not out-produce industrial technology per worker, and pretending otherwise weakens the case. Its claim is that where labour is abundant and capital is scarce, more total welfare is generated by a technology that employs many people at moderate productivity than by one that employs few at high productivity and leaves the rest without work.
5.3.7 Focus on Employment
This is the point on which the two paradigms diverge most sharply, and it can be stated as a single choice.
A country with scarce capital and abundant labour can invest a given sum in one large plant employing a hundred workers, or in a thousand small units employing several thousand. The first yields more output per worker; the second yields more employment per rupee invested. The conventional growth paradigm, judged by output, prefers the first. The Gandhian approach, judged by whether the last person has work, prefers the second.
Labour-intensive production uses a high ratio of labour to capital; capital-intensive production the reverse. The argument for labour intensity in a labour-surplus economy is not sentimental. Where a worker who does not get a job in the plant has no other job to go to, the true cost of employing that worker is very low, and the output foregone by using the more labour-intensive method may be smaller than the wages and dignity gained.
The nuance usually lost is that this was never an objection to machinery as such. The stated objection was to machinery that displaces labour which has nowhere else to go, and to the concentration of ownership that large machinery brings — not to the sewing machine, the bicycle or the improved plough, all of which were welcomed. Tools that extend what a worker can do were treated differently from machines that make the worker unnecessary.
5.3.8 The Gandhian Approach Contrasted with Today’s Paradigm of Growth
The two approaches examined in this chapter differ not in degree but in what they are trying to maximise. Setting them side by side makes the difference exact.
Neither column is a verdict. The two are best read as answers to different questions — one asking how much can be produced, the other asking for whom and at what cost — and most actual policy in India and elsewhere has drawn on both, sometimes without noticing the tension.
5.4 Urban Environmental Problems
A city is a very large machine for moving four things: water in, waste out, people about, and energy through. Section 5.1 showed why the machine is asked to serve more people every year. This section looks at what happens inside it when the number of users grows faster than the machine.
Six problems are taken up in turn. They are treated here at the level of what causes them and why they are hard, since the solutions are the subject of section 5.5.
5.4.1 Sanitation
Sanitation means the arrangements by which human excreta and other liquid waste are separated from human contact and safely disposed of. It is not the same as cleanliness, and it is not the same as having a toilet: a toilet whose contents end up in an open drain has provided privacy but not sanitation.
That phrase “the whole chain” is the key to the urban problem, and Fig. 5.4-1 sets it out. A city can perform well at the first step and fail entirely at the third or fourth, and the failure is invisible from the street.
Diagram
Fig. 5.4-1 – flow: toilet (containment in septic tank, pit or sewer connection) → emptying or conveyance (desludging tanker or sewer line) → transport → treatment plant → treated effluent to river or reuse; below the chain, three broken-arrow branches labelled “sludge emptied into a storm drain”, “sewer discharging untreated into a nallah”, “treatment plant built but not connected or not operating” leading to a box labelled “contaminated surface water and groundwater”
There are two ways to build the chain. In sewered sanitation, a network of underground pipes — the sewerage system — carries waste water away with a large volume of flushing water to a central treatment plant. In on-site sanitation, waste is contained where it is produced, in a septic tank or a lined pit, and the accumulated faecal sludge is periodically emptied by tanker and taken for treatment.
Neither column is simply better. Sewerage is the technically cleaner solution and the one most large cities aim for; it is also the one that takes decades and requires households to have secure enough tenure for a network to be laid to them. On-site systems reach people quickly, and their weak point is not the toilet but what happens to the sludge, which is where most on-site sanitation in practice fails.
The consequences of failure anywhere along the chain are the same: faecal contamination of surface water and shallow groundwater, and the diarrhoeal illnesses that follow, which fall most heavily on young children.
5.4.2 Water Management
Urban water has three distinct problems, and confusing them leads to the wrong solution being applied to each.
Quantity and source. Cities draw water from rivers, reservoirs and groundwater, increasingly from further away as nearby sources are exhausted or polluted. Long-distance transfer is expensive in money and in energy, since water is heavy and usually has to be pumped uphill. Where surface supply falls short, the gap is met from borewells, and if extraction exceeds recharge the water table falls year on year — the mechanism described in section 5.2.3.3, now operating under a city instead of a field.
Distribution and loss. A large share of the water a utility produces never reaches a paying customer. Water lost through leaking mains, unmetered use and faulty billing is called non-revenue water, and in many cities it is a third or more of what is put into the system. Every litre lost has already been treated and pumped, so the loss is of money and energy as well as water.
Access and price. Households on the network typically pay a low tariff per litre. Households not on the network buy from tankers, private borewell owners or packaged-water sellers, at many times that rate — the paradox noted in section 5.1.5. Supply is also intermittent almost everywhere in India, available for a few hours a day, which forces every household to store and pump, and which draws contaminated groundwater into the pipes through leaks whenever the mains lose pressure.
Then there is water the city does not want. Storm water — rainfall running off roofs, roads and paved surfaces — is a separate flow from sewage, and where the two share a channel, heavy rain pushes untreated sewage into streets and rivers. Cities also flood more readily than the countryside for a reason that is worth understanding properly.
Diagram
Fig. 5.4-2 – two side-by-side cross-sections receiving equal rainfall; left “natural surface”: large downward arrows labelled infiltration, small arrow labelled runoff, groundwater table shown recharging; right “paved urban surface”: small or absent infiltration arrow, large horizontal arrow labelled runoff to storm drain, groundwater table shown declining; both panels labelled with the same rainfall figure
5.4.3 Transport
The transport problem in a growing city is usually described as too many vehicles. It is more accurately described as too little road space per person moved.
The measure that matters is modal share — the proportion of all trips made by each mode: walking, cycling, bus, rail, two-wheeler, car, auto-rickshaw. In most Indian cities the majority of trips are still made on foot, by cycle, or by public transport, while the majority of road space and parking is occupied by private vehicles. Fig. 5.4-3 shows why that mismatch produces congestion out of proportion to the number of vehicles.
Diagram
Fig. 5.4-3 – three panels showing the road space needed to move 50 people; panel 1: about 40 cars occupying a long stretch of road; panel 2: one bus occupying a short stretch; panel 3: 50 bicycles occupying a moderate stretch; each panel labelled with the mode and captioned “same 50 people”
Congestion has four environmental consequences. Vehicles emit more per kilometre when moving slowly and idling than at steady speed. Emissions are concentrated exactly where people live, walk and wait. Travel time rises for everyone, including the buses stuck in the same jam, which drives further people to private vehicles. And road space, once given to parking and carriageway, is not available for anything else.
There is a trap here that recurs in city after city: widening a road relieves congestion briefly, the extra capacity makes driving more attractive, and traffic grows to fill it. Building road capacity alone therefore tends not to solve congestion, which is why the interventions examined in section 5.7 concentrate on moving people rather than moving vehicles.
5.4.4 Energy
A city’s energy demand is the sum of four uses: buildings, industry, transport, and the water and waste system itself. The last of these surprises people. Pumping water uphill from a distant source, distributing it, and then collecting and treating waste water can account for a very large share of a municipality’s entire electricity bill — often its single largest item.
Two features of urban energy demand cause particular difficulty. The first is peak demand: consumption is not spread evenly through the day but concentrated in the evening, and in hot months, in the afternoon. A system must be built for its peak, not its average, so the peak sets the cost.
The second is the urban heat island effect — the tendency of a built-up area to be warmer than the countryside around it, because concrete, asphalt and masonry absorb solar radiation during the day and release it at night, because there is little vegetation to cool the air through transpiration, and because engines, air conditioners and machinery release heat directly. A city several degrees warmer than its surroundings uses more energy for cooling, which releases more heat, which raises demand further.
Fuel choice matters as much as quantity. Households without reliable electricity or clean cooking fuel burn biomass, kerosene or waste indoors, and indoor air pollution from cooking is among the most serious health exposures in low-income urban housing, particularly for the women and young children who spend most time near the stove.
That last point can be turned into a calculation, because it is exactly what a municipal engineer has to do.
Take a city of 10 lakh (1,000,000) people supplied at 135 litres per person per day. Total supply is
\[Q_s = 1{,}000{,}000 \times 135 = 1.35 \times 10^{8} \text{ litres per day} = 135 \text{ MLD}\]
Design practice commonly assumes that about 80 per cent of the water supplied returns as sewage, the rest being lost to evaporation, gardening and other consumptive uses. So sewage generated is
\[Q_w = 0.80 \times 135 = 108 \text{ MLD}\]
If the city’s treatment plants can handle 60 MLD, the untreated remainder is
\[108 - 60 = 48 \text{ MLD}\]
That is 48 million litres of untreated sewage entering a drain, a nallah or a river every single day — and it is generated by a supply system that, on paper, is working normally. The arithmetic explains why water quality downstream of a city falls sharply even when nothing has gone visibly wrong: treatment capacity was simply never built to match supply.
5.4.5 Air Quality
Urban air quality is a problem of sources and of geometry.
The sources in an Indian city are mixed, and their relative importance differs from city to city and from season to season: vehicle exhaust, road and construction dust, domestic and commercial burning of solid fuel, waste burning, small industrial units, diesel generators run during power cuts, and — in some regions and seasons — smoke carried in from outside the city altogether. Because the mix varies, a measure that works in one city may achieve little in another, which is why source apportionment studies precede serious action.
The geometry matters as much as the quantity. Emissions released at street level, between rows of buildings, in still air, disperse very poorly, so concentrations at the height at which people breathe can be far higher than a city-wide average suggests. Winter makes this worse: cold, stable air traps pollutants near the ground, so the same emissions produce higher concentrations in December than in July.
The people most exposed are not the people who generate most of the emissions. A traffic constable, a street vendor, a cycle-rickshaw puller and a construction worker spend their working lives at roadside level; a car occupant passing the same junction spends four minutes there.
The measurement of pollutants, the standards they are judged against and the instruments used are dealt with under monitoring, and are not repeated here.
5.4.6 Housing
Housing is where the urban environmental problems described above converge, because a household’s water, sanitation, energy and exposure to pollution are all determined largely by where it lives.
The shortage is not a shortage of construction. Cities build a great deal. The shortage is of housing at prices that the workers a city depends on can pay, and it arises from land: urban land is expensive, well-located land is scarce, and both formal building regulations and finance are difficult to access without documents and a regular recorded income.
What follows is informal settlement, and the decisive variable in it is security of tenure — a household’s legal or effective assurance that it will not be evicted. Tenure explains almost everything else. A household that expects to be there in ten years invests in a solid roof, a toilet and a water connection. A household that does not, cannot; and a utility, for its part, will not lay a water main or a sewer to housing whose legal status is unsettled. The insecurity and the missing services reinforce each other.
Overcrowding then multiplies the harm. High occupancy per room speeds the transmission of respiratory and other infectious disease; shared or absent toilets make the sanitation chain fail at its first link; and settlements pushed onto the land nobody else wanted are frequently the land that floods, or that lies beside a drain, a railway line, a landfill or an industrial boundary.
5.4.7 Economic and Political Constraints in Tackling These Problems
If the problems are well understood and the engineering is largely known, why do they persist? The obstacles are mostly not technical.
Economic constraints
Capital cost and lumpiness. Trunk sewers, treatment plants and rail systems cost a great deal and deliver nothing until they are finished. A municipality cannot buy a tenth of a sewage treatment plant and get a tenth of the benefit.
Weak municipal finance. Urban local bodies in India raise a small share of their own expenditure, depending on transfers from higher levels of government. Own-source revenue — chiefly property tax and user charges — is limited by out-of-date property records and by collection difficulties.
Tariffs below cost. Water and waste services are typically charged at rates that do not cover the cost of producing them. This keeps water affordable, which is a genuine social objective; it also means the utility cannot finance maintenance, so supply deteriorates, so those who can afford to opt out do so — and the utility loses precisely the customers whose payments would have cross-subsidised the rest.
Operation and maintenance. Capital funding is easier to obtain than running costs, so plants get built and then run below capacity, or not at all, for want of power charges, spares and trained operators. A treatment plant that is not operating is indistinguishable, in the river, from one that was never built.
Political and institutional constraints
Fragmented responsibility. Water supply, sewerage, storm drains, roads, buses, land use and pollution control frequently sit with different agencies answering to different authorities. A single stretch of road may be dug three times in a year by three of them.
Mismatch of boundaries and horizons. A city’s air shed, watershed and labour market extend well beyond its municipal boundary, while planning powers stop at it. And the projects that matter most take longer to complete than the terms of those who authorise them, which biases spending towards works that finish quickly and show visibly.
The status of unrecognised settlements. Extending services to settlements without legal status raises questions about tenure that are politically difficult, so services are often not extended — leaving a large share of the population outside the system that is supposed to protect public health for everyone, including those already inside it.
Charging for a service people receive badly. Raising a tariff is far harder when the existing service is intermittent and unreliable, and the service is unreliable partly because the tariff is too low. Breaking out of that loop usually requires visible improvement first and payment afterwards, which is the opposite of how financing normally works.
These constraints are the reason the next section is about solutions that are cheap, incremental and locally built rather than about the largest available technology. It is not that big systems do not work. It is that a city which cannot finance, staff or maintain a big system needs solutions that can begin on Monday in one neighbourhood.
5.5 Indigenous Solutions for the Urban Environment
5.5.1 Why First World Solutions Often Do Not Transfer
The technologies that gave wealthy cities clean water, safe sanitation and managed waste are well documented and freely available. They are also, in many developing-world cities, the wrong answer — not because they do not work, but because the conditions they assume are absent.
Six assumptions are built into the conventional model, and each of them can fail.
Capital available in advance. A trunk sewer and a treatment plant must be paid for before a single household benefits. A municipality that cannot fund maintenance cannot fund the network.
Plenty of water to waste. A sewer works by using water as the transport medium; a flush toilet spends several litres of treated drinking water to move a fraction of a litre of waste. A city supplying water for three hours a day cannot spare it.
A regular street layout with settled tenure. Networks are laid along rights of way, to buildings with recognised addresses. A settlement of narrow, irregular lanes on land with unresolved status cannot easily be connected — and often is not.
Technical staff and spare parts on call. Large plants need trained operators, laboratory support and a supply of components. Where these are missing, the plant is built, commissioned and then quietly stops running.
Costs recovered through tariffs. The model assumes a customer base able to pay something close to the cost of service. Where a large share of users cannot, the finances do not close.
A gentle, spread-out rainfall pattern. Storm drains in temperate cities are designed for rain that arrives steadily. A monsoon delivers a large share of the annual total in a few intense hours, so a drainage system copied from elsewhere is undersized from the day it opens.
Add one further difference. In a wealthy city, almost everything is formal — registered buildings, registered jobs, registered vehicles, contracted waste collection. In most cities of the developing world a large part of the economy is informal, including much of the waste system, which is often run in practice by waste pickers and small scrap dealers who recover materials at no cost to the municipality. A plan that ignores them removes an existing, working system and replaces it with one that has to be paid for.
None of this means big infrastructure is a mistake. Large cities do need trunk systems, and they should build them. It means that a city cannot wait for them, and that the solutions which have actually improved conditions in the meantime share a particular character: cheap, small, incremental, buildable one neighbourhood at a time, and maintainable by the people who use them. The rest of this section describes those solutions. You will notice how closely their logic matches the principles set out in section 5.3, arrived at from a completely different direction.
5.5.2 Rainwater Harvesting
The cheapest water a city can obtain is the water that falls on it. Rainwater harvesting is the collection of rainwater where it falls — from rooftops, paved courtyards and open ground — for direct use or for recharging groundwater, instead of allowing it to run off into drains.
A rooftop system has five parts, shown in Fig. 5.5-1. The roof is the catchment; gutters and downpipes convey the water; a first-flush arrangement diverts the first few minutes of rain, which carries the dust, leaves and droppings washed off the roof; a filter removes remaining solids; and the water then goes either to a storage tank for use or to a recharge structure — a pit, trench or existing borewell — that puts it back into the aquifer.
Diagram
Fig. 5.5-1 – rooftop rainwater harvesting system in section; rooftop catchment → gutter and downpipe → first-flush diverter (shown discharging the initial runoff to waste) → filter chamber with layers of gravel, coarse sand and charcoal → branch A to storage tank with tap for use, branch B to recharge pit lined with boulders and gravel meeting the water table; the water table drawn as a dashed line with an upward arrow labelled “recharge”
Which branch a household chooses matters. Storage gives water it can use immediately but is limited by tank size; recharge stores an unlimited quantity underground at almost no cost, but the water can only be recovered through a well and is shared with everyone drawing on the same aquifer. In a city with falling water tables, recharge is often the more valuable option.
The quantity involved surprises most people, so it is worth calculating. Take a flat roof of area \(A = 100 \text{ m}^2\) in a place receiving annual rainfall \(R = 600 \text{ mm} = 0.6 \text{ m}\). Not all of it can be caught — some evaporates, some wets the surface, some is lost at the first flush — so a runoff coefficient \(C\) is applied, typically about \(0.8\) for a hard roof.
\[V = A \times R \times C\]
\[V = 100 \times 0.6 \times 0.8 = 48 \text{ m}^3\]
Since \(1 \text{ m}^3 = 1000 \text{ L}\):
\[V = 48\,000 \text{ L per year}\]
At a modest domestic use of 135 litres per person per day, a five-member household consumes about \(135 \times 5 \times 365 \approx 2\,46\,000\) litres a year. One ordinary roof therefore supplies roughly a fifth of that household’s annual water — from a surface that already exists, at no cost in pumping, treatment or transmission. Multiply by every roof in a ward and the figure becomes significant against the city’s supply.
Rainwater harvesting has genuine limits. It is seasonal — a storage tank is empty by the end of a long dry period. It requires that the catchment be reasonably clean. And recharge is pointless, even harmful, where the water table is already at the surface or where the runoff is contaminated, since polluted water put into an aquifer is extremely difficult to clean up.
5.5.3 Garbage Segregation
Every other solution in solid waste management depends on this one, so it is worth being blunt about why. Once wet food waste is mixed with paper, plastic, glass and metal, the paper is soiled, the plastic is contaminated, the mixture will not burn well and it will not compost cleanly. Almost all of the value is destroyed in the first thirty seconds, in the household’s own bin.
Segregation at source means separating waste into streams at the point where it is generated, before collection. The standard Indian classification uses three streams: wet or biodegradable waste (kitchen and garden waste), dry recyclable waste (paper, plastic, metal, glass, cloth), and domestic hazardous waste (batteries, tube lights, expired medicines, paints, sanitary waste, which must be kept out of both the other streams).
Diagram
Fig. 5.5-2 – flow of segregated municipal solid waste; household with three bins — wet, dry, domestic hazardous → separate collection → wet stream to composting or biogas plant producing compost and gas; dry stream to sorting and recycling by material; hazardous stream to designated treatment and disposal; alongside, a parallel flow labelled “mixed waste” leading directly to landfill with a note “little recovery possible”
Segregation matters because of what the waste is actually made of.
Read the first row against the second. Roughly half of Indian municipal waste is wet and biodegradable, which is exactly the fraction that makes mixed waste heavy, smelly and difficult to burn — and exactly the fraction that can be treated locally, at low cost, if it is kept apart. That single fact drives most of what follows in this section, and it also explains why waste management strategies imported from countries whose waste is drier and more packaging-heavy tend to perform poorly here.
5.5.4 Composting
Composting is the controlled aerobic decomposition of biodegradable waste by micro-organisms into a stable, dark, soil-like material called compost. “Aerobic” is the essential word: the same waste breaking down without oxygen produces methane and a powerful smell, which is precisely what happens inside a landfill.
Four conditions decide whether a compost heap works. There must be a workable mixture of nitrogen-rich material (kitchen waste, green leaves) and carbon-rich material (dry leaves, sawdust, shredded paper), roughly one part of the first to three parts of the second by volume. There must be moisture, but not saturation — damp like a wrung-out cloth. There must be air, which is why the heap is turned. And there must be time, typically several weeks to a few months depending on temperature and how finely the material is broken up.
Vermicomposting uses earthworms to accelerate the process; the worms fragment the material and pass it through their gut, and the product is finer and richer. It is well suited to household and institutional scale, but the worms are sensitive — they will not tolerate a heap that becomes hot, waterlogged, acidic or salty, so vermicomposting demands more care than ordinary composting rather than less.
The advantages for a city are practical rather than sentimental. Half the waste stream is treated where it arises, so collection vehicles carry less, travel less and cost less. The landfill receives less wet material, so it produces less methane and less leachate — the contaminated liquid that drains out of a waste heap and can pollute groundwater. And the compost returns organic matter to soil that is generally short of it.
The limitations are equally practical. Composting needs space and consistent attention; a neglected heap turns anaerobic and becomes a nuisance that ends community support very quickly. Contaminated feedstock — a few batteries, some glass, a plastic bag — produces compost that nobody will buy. And a large city composting plant only works if the market for compost is real; several have been built, run for a while and closed because the product could not be sold at a price covering the cost of making it.
5.5.5 Energy from Solid and Liquid Wastes
Waste contains energy, and there are three broad routes to recovering it.
Anaerobic digestion. Wet organic waste and liquid waste are digested by micro-organisms in a sealed vessel without oxygen, producing biogas — a mixture of roughly half to two-thirds methane with carbon dioxide — and a nutrient-rich slurry usable as fertiliser. Biogas burns for cooking, for lighting, or in an engine to generate electricity. This route suits Indian conditions particularly well, because it wants exactly the wet waste that makes everything else difficult, and it scales from a single kitchen plant to a municipal facility.
Landfill gas recovery. The same anaerobic decomposition happens spontaneously inside a landfill. Piping the gas out and burning it recovers energy and, more importantly, converts methane to carbon dioxide, which is far less potent as a greenhouse gas.
Thermal routes. Incineration burns waste and uses the heat to raise steam and generate electricity. Two related processes are gasification, which converts waste at high temperature with a restricted oxygen supply into a combustible gas, and pyrolysis, which decomposes waste by heating in the absence of oxygen — typically at several hundred degrees Celsius — into gas, liquid oil and a solid char.
Thermal treatment of municipal waste is the most contested option in this whole field, and the argument is worth understanding rather than memorising. Burning requires waste with a sufficiently high calorific value; Indian municipal waste, being wet and mixed with inert dust and grit, often has a low one, which means supplementary fuel must be added and the plant may generate far less than designed. Combustion also produces air pollutants and ash requiring careful management, and the plant is expensive and needs skilled operation. Set against this, incineration reduces waste volume greatly and is valuable where land for landfill is genuinely unavailable. A further objection is economic rather than technical: a plant financed on the promise of a guaranteed daily tonnage has an interest in receiving mixed waste, which works directly against the segregation and composting that the previous two subsections showed to be the cheaper first step.
5.5.6 Sewage Management: Dry Toilets
A dry toilet is a toilet that operates without water, containing and treating excreta where it falls rather than flushing it away. This is not a step backwards from a flush toilet; it is a different design responding to a different constraint — no reliable water and no sewer.
Three types are in common use. A composting toilet mixes excreta with a carbon-rich material such as ash, sawdust or dry leaves added after each use, which absorbs moisture, controls odour and supports aerobic decomposition into a compost-like material. A urine-diverting dry toilet separates urine at the pan through a divided seat; this is the key design idea, because urine contributes most of the moisture and most of the nitrogen, and separating it keeps the solid fraction dry enough to break down without smell. Twin-pit systems use two chambers alternately: one is filled and then sealed while the second is used, and by the time the second is full the contents of the first have decomposed and can be safely removed.
The advantages are direct. No water is used and no sewer is needed, so the toilet can be built in a settlement with neither. Nutrients — nitrogen, phosphorus, potassium — are recovered rather than discharged into a river. And the cost is within reach of a household.
The limitations are equally real and should not be glossed over. The system requires correct daily use, including the addition of covering material; if it is not maintained it fails obviously and unpleasantly. Pathogens in the solid fraction need adequate time, dryness and, ideally, raised temperature to die off before the material is handled, so the storage period matters and cannot be shortened for convenience. And acceptance is a genuine issue: any system involving the later handling of stored material raises questions that must be settled by mechanical design and by proper equipment for those who empty it, never by assuming that a particular group of people will do the work.
5.5.7 Sewage Management: Decentralized Water Management System (DEWATS)
DEWATS — correctly expanded as the Decentralised Wastewater Treatment System — is an approach in which sewage from a cluster of buildings, a housing colony, a hospital, a school or a small industrial estate is treated close to where it is produced, in a compact set of chambers, instead of being piped across the city to a central plant.
The treatment train has four stages, shown in Fig. 5.5-3, and the water moves through all of them by gravity, with no pumps and usually no electricity.
Diagram
Fig. 5.5-3 – flow of a DEWATS treatment train in section: raw sewage inflow → 1. settler (heavy solids settle as sludge, floating scum retained) → 2. anaerobic baffled reactor (a series of chambers with baffles forcing flow up through sludge blankets) → 3. anaerobic filter (chamber packed with stones or gravel supporting a bacterial film) → 4. planted gravel filter (horizontal gravel bed planted with reeds or canna, roots supplying oxygen) → treated effluent to reuse for gardening or safe discharge; the whole train marked “flow by gravity, no pumping” and a separate arrow from stage 1 labelled “sludge removed periodically”
Stage one is physical: solids settle out. Stages two and three are anaerobic biological treatment, in which bacteria growing without oxygen consume the dissolved organic matter — the same process as in a biogas plant, and gas can be collected from it. Stage four is aerobic polishing in a planted gravel bed, where the plant roots carry oxygen into the medium and support the bacteria that finish the job; the plants also make the installation look like a garden, which matters when it sits inside a residential colony.
The advantages follow from the design: low running cost, no dependence on a grid connection, construction by local labour with local materials, treated water available for gardening or flushing right where it is generated, and — the strategic point — a system that can be installed for one colony next month rather than for the whole city in fifteen years.
The limitations are equally clear. Each installation needs land on the site. The chambers must be correctly sized by someone who knows the design; undersized systems discharge partly treated sewage. Sludge accumulates and must be removed periodically, and if it is not, performance falls quietly rather than visibly. And these are biological systems for domestic sewage — they cannot handle industrial effluent containing heavy metals or toxic chemicals, which kill the bacteria the whole process depends on.
Read against section 5.4.7, the appeal is easy to see. Decentralised systems need small amounts of capital rather than large, land in small parcels rather than corridors, and maintenance skills rather than plant operators — which is to say they are designed for the constraints a city actually has, instead of for the ones a textbook assumes it has.
5.6 New Urbanism and Smart Growth
Sections 5.4 and 5.5 dealt with services — water, waste, sewage, energy. This section deals with something prior to all of them: the shape of the city itself. How far apart things are placed, how streets connect, and what is allowed to be built next to what will decide, for the following fifty years, how much water must be pumped, how far people must travel, and how much land is paved.
The problem both of the ideas in this section respond to is urban sprawl — the outward spread of a city in low-density, single-use, car-dependent development, consuming land at the edge while the older core is left behind.
Sprawl is environmentally expensive for reasons that follow from its geometry rather than from anyone’s carelessness. Spreading the same population over more land means more kilometres of pipe, wire, sewer and road per household to build and maintain. Separating homes from shops and workplaces means every activity requires a vehicle trip. Paving a larger area means more runoff and less recharge — the effect shown earlier in Fig. 5.4-2. And expansion at the edge takes exactly the land that was doing useful work: farmland, orchards, wetlands, tanks and drainage channels.
5.6.1 Features of New Urbanism
New Urbanism is an urban design movement that emerged in the United States in the 1980s and was formalised in the early 1990s, arguing that neighbourhoods should be designed at the scale of the walking human being rather than of the moving car. It began as a reaction to the post-war North American suburb, and its features are best understood as the systematic opposite of that pattern.
A walkable neighbourhood with a centre and an edge. The organising unit is a neighbourhood whose everyday needs — shops, a school, a place to catch a bus, a park — lie within a comfortable walk of its residents.
Mixed land use. Homes, shops, offices, schools and small workplaces are placed together rather than zoned into separate districts, so that most daily trips are short and many require no vehicle at all.
Mixed housing types and incomes. Different sizes and prices of dwelling within the same neighbourhood, so that a place is not sorted by income.
A connected street network. Many small, interconnected streets in place of a few large arterial roads feeding dead ends. A connected grid offers several routes between any two points, which spreads traffic instead of concentrating it and shortens walking distances substantially.
Streets designed for people as well as vehicles. Continuous footpaths, narrower carriageways, shade trees, and buildings that face the street with doors and windows rather than presenting a blank wall or a parking lot.
Moderate to high density and transit orientation. Enough people living close enough together to make frequent public transport viable, with the densest development placed near transit stops.
Public space and civic buildings as focal points. Squares, parks and prominent public buildings given the good sites, on the argument that a neighbourhood needs somewhere collective to be.
Diagram
Fig. 5.6-1 – two neighbourhood layouts drawn side by side at the same scale for the same number of households; left panel “sprawl pattern”: large plots, curving streets ending in cul-de-sacs, a single arterial road, shops shown as a separate complex 3 km away, a long dashed line marking the trip from house to shop; right panel “new urbanist pattern”: compact plots, an interconnected grid of small streets, shops and school within the neighbourhood, a short dashed line marking the same trip on foot; both panels labelled with total road length required
5.6.2 Goals of Smart Growth
Smart growth is the associated planning approach: a set of goals for directing where and how a city grows, so that expansion is compact and served by existing infrastructure rather than scattered and car-dependent. Where New Urbanism is chiefly about the design of a place, smart growth is chiefly about the policy decisions that determine which places get built at all.
Its goals are conventionally stated as ten.
- Mix land uses, so that homes, work and services are close together.
- Use compact building design, to reduce the land consumed per household.
- Create a range of housing opportunities and choices, across types and price levels.
- Create walkable neighbourhoods.
- Foster distinctive, attractive communities with a strong sense of place.
- Preserve open space, farmland, natural beauty and critical environmental areas.
- Strengthen and direct development towards existing communities, using land and infrastructure already available rather than new land at the edge.
- Provide a variety of transport choices — walking, cycling, bus, rail — rather than assuming the car.
- Make development decisions predictable, fair and cost-effective, so that good projects are not delayed and bad ones are not approved by default.
- Encourage community and stakeholder collaboration in development decisions.
Notice that goals 7, 9 and 10 are not about design at all. They are about how decisions get made — which is precisely where section 5.4.7 located the real constraint.
How far do these ideas transfer?
Both ideas were formulated in a specific setting — wealthy, car-owning, low-density North American cities — and section 5.5.1 gave the general warning about imported solutions. Apply it here.
Much of what New Urbanism recommends already exists in Indian cities, and did long before the movement had a name. The older parts of most Indian towns are dense, mixed in use, finely connected, and walkable; a shop below and a home above is the traditional arrangement, not an innovation. In this sense the useful reading of these ideas here is not as a model to import but as an argument for not destroying what is already in place — which is exactly what happens when a mixed old quarter is replaced by separated zones, or a lane network is broken up by a wide road.
Two further cautions are worth stating plainly. First, density in an Indian city is not automatically a virtue: crowded housing without water, sanitation, light and open space is dense and thoroughly unhealthy, and compactness only works when it is accompanied by services and public space. Second, making a neighbourhood more attractive and better connected raises its land values, which can push out precisely the low-income households that the mixed-income goal was meant to include. Neither caution invalidates the ideas. Both mean that the tenth goal — genuine involvement of the people who live in a place, before the plan is finalised — is not decoration on the list. It is the safeguard that decides whether the other nine improve a neighbourhood or displace it.
5.7 Urban Planning and Management: Four Examples from the Developing World
Four cities are studied here because each solved — or failed to solve — a problem that section 5.4 identified, and did so under the constraints that section 5.4.7 described. Read them as evidence, not as models to copy. What travels between cities is rarely the scheme itself; it is the reasoning behind it.
5.7.1 Bogotá, Colombia — Traffic Management
Bogotá is the capital of Colombia, a large, high-altitude city that grew very rapidly in the second half of the twentieth century. By the 1990s it had the standard set of symptoms: severe congestion, a chaotic and unsafe private bus system, high road casualties, and no rail-based mass transit. A metro had been discussed for decades and repeatedly postponed, for the reason given in section 5.4.7 — it needed capital the city did not have, and years the city could not wait.
The response was to ask what a metro actually does, and whether a bus could be made to do it. A metro’s advantages are a dedicated right of way, high capacity, frequent service, level boarding and payment before boarding. None of these is inherent to rail.
Bus rapid transit (BRT) is a bus system given the operating characteristics of a metro: buses run in lanes physically separated from other traffic, stop at enclosed stations rather than at kerbside, passengers pay at the station and board through wide doors at platform level, and services run at high frequency along trunk corridors fed by ordinary buses from the neighbourhoods. Bogotá’s system, opened at the end of 2000, was built along the city’s main corridors in stages, each stretch opening as it was completed rather than waiting for the whole network.
Diagram
Fig. 5.7-1 – cross-section of a bus rapid transit corridor; from the centre outward: two dedicated bus lanes separated by a raised kerb, with an enclosed station platform between them at bus-floor level showing a ticket barrier at the entrance; then mixed traffic lanes on either side; then a protected cycle track; then a footpath with trees; each element labelled, and the station marked “payment before boarding, level entry”
Two further measures accompanied it. The city built a large connected network of protected cycle tracks, on the argument that a cycle track is the cheapest transport infrastructure that exists. And it expanded a much older practice, the Ciclovía, in which major roads are closed to motor vehicles on Sundays and public holidays and given over to people walking, cycling and running — a weekly demonstration, at no capital cost, of what the same road space can do.
5.7.2 Cuba — Urban Agriculture Using Organic Methods
Cuba’s urban agriculture was not a design choice. It was an emergency response, and that is what makes it useful evidence.
Until the end of the 1980s, Cuban agriculture was highly industrialised and highly dependent on imports: fuel, machinery, chemical fertilisers and pesticides arrived on favourable terms through trade with the Soviet Union and Eastern Europe. When that trading system dissolved between 1989 and 1991, the imports stopped almost at once. Fuel for tractors and for transporting food to the cities became scarce, and so did every purchased agricultural input. Food shortages followed.
Two constraints then shaped the response. Without fuel, food could not be moved far — so it had to be grown close to where people ate it. Without imported fertiliser and pesticide, it had to be grown with organic methods, since there was no alternative.
The characteristic form that emerged is the organopónico: a raised bed built on any available urban surface, including poor or paved ground, walled with low concrete or blockwork and filled with a mixture of soil and organic matter, irrigated by drip or hand watering, and cropped intensively. Vacant lots, land beside buildings, roadside strips and rooftops were brought into use.
Diagram
Fig. 5.7-2 – section through an organopónico raised bed; low concrete or block retaining walls about knee height on an unsuitable or paved base; bed filled with a mixture of soil and compost; drip irrigation line along the surface; leafy vegetables growing; adjacent narrow walking path; labels showing “compost and vermicompost added”, “biological pest control — beneficial insects and plant-based preparations”, “beds raised because the underlying ground is poor or paved”
The supporting practices are the ones section 5.5.4 described, applied at city scale: composting and vermicomposting of organic waste to supply the beds; biological pest control using beneficial insects and plant-based preparations instead of synthetic pesticide; crop rotation and intercropping to interrupt pest cycles and maintain fertility; and a network of local supply centres providing compost, seed and biological control agents to growers. Land was made available to individuals, cooperatives and state enterprises, and produce was sold at the point of production, which removed the transport step entirely.
5.7.3 Curitiba, Brazil — Traffic Planning and Urban Renewal
Curitiba, the capital of the state of Paraná in southern Brazil, faced the same pressure as every Brazilian city in the decades after 1950, when agricultural mechanisation displaced rural labour and people moved to the cities in very large numbers. What distinguishes it is that it decided early — in a master plan adopted in the mid-1960s — how it wanted to grow, and then held to that decision for decades.
The central idea is the one that section 5.6 identified as decisive: transport and land use were planned as a single system rather than as two. Growth was directed along a small number of structural axes radiating from the centre. Along each axis runs a distinctive road arrangement — a central road carrying dedicated bus lanes with slow local traffic beside it, flanked by two one-way roads a block away carrying faster through traffic in opposite directions. Building rules then permitted the tallest, densest development along exactly these axes, and progressively lower density away from them. The result is that the people live where the buses are, by design, rather than by accident.
Diagram
Fig. 5.7-3 – plan and section of a Curitiba structural axis; centre: the trinary road system, with a central road containing two dedicated bus lanes plus slow local lanes, and one-way through roads one block away on either side; above, a section showing building heights — tall buildings immediately along the axis, stepping down to low-rise development further away; labels “highest permitted density along the transit axis”, “density falls with distance from the axis”
The bus system was developed in stages from the mid-1970s and became the model from which Bogotá and others later learned. Its elements: express buses in dedicated lanes on the axes; feeder services from the neighbourhoods and inter-district services running between axes without passing through the centre; a single integrated fare so that a passenger may transfer between services without paying again; and the innovation Curitiba is best known for — the tube station, a raised, enclosed boarding platform where passengers pay before entering and board level with the bus floor through wide doors, which cuts the time a bus spends standing still to a few seconds.
Two other measures belong to the same way of thinking. Areas liable to flood were not built on but converted into parks, so the floodplain does its hydrological job while also serving as public open space — a solution that costs less than a drainage system and yields more. And in the steep, narrow settlements where collection trucks could not go, the city organised an exchange in which residents bringing sorted waste to collection points received bus tokens or food in return; segregation and collection were achieved by making them worth someone’s while, rather than by regulation that could not be enforced.
5.7.4 Cochabamba, Bolivia — Water Management and Protests Against Privatisation of Water Supply
Cochabamba is a large city in a semi-arid valley in Bolivia. Its water problem is old and physical: not enough local supply for the population, a municipal utility unable to serve much of the city, and large peri-urban areas depending on private wells, small community water committees and tanker deliveries — at prices per litre well above what connected households paid. This is the pattern described in section 5.1.5, in an acute form.
In 1999 the national government enacted a new water and sanitation law and granted a long-term concession for the city’s water supply to a private consortium, which took over the municipal utility’s operations. The concession was expected to finance a major new supply project, including a long-delayed dam and tunnel scheme, and to extend the network.
Water tariffs for connected users were raised steeply in early 2000. Objections were also raised to provisions of the new law concerning rights over water sources, which residents who depended on their own wells and community systems understood as threatening their existing arrangements. A broad coalition of neighbourhood committees, irrigators, trade unions and professional associations formed to oppose the changes, and organised strikes and blockades over several months.
Diagram
Fig. 5.7-4 – timeline of the Cochabamba water dispute; 1999: new water and sanitation law enacted and concession granted to a private consortium → early 2000: steep tariff increases announced → January to April 2000: strikes, road blockades and mass protest by a broad coalition; clashes with security forces; a state of emergency declared → April 2000: concession cancelled and the water system returned to the municipal utility → 2006: the consortium’s international arbitration claim against Bolivia withdrawn
The protests grew through the first months of 2000, and confrontations between demonstrators and security forces led to injuries and to one death. A state of emergency was declared. In April 2000 the concession was cancelled and the water system returned to the municipal utility. An international arbitration claim brought by the consortium’s investors was later withdrawn, in 2006.
The general point deserves to be stated carefully and without taking sides. Water supply has to be paid for — pipes, pumps, treatment and staff all cost money — and a utility funded below its costs cannot maintain or extend its network, which was section 5.4.7’s central finding. At the same time, water is not an ordinary commodity: a household cannot decline to buy it, and the households paying the most per litre are usually those with no connection at all. Every arrangement, public or private, has to answer both facts at once. Cochabamba is studied because it shows what happens when the second fact is not addressed before the first is acted upon.
What the four examples have in common
Three threads run through all four. Each response was shaped by a constraint rather than chosen from a catalogue of best practice. Each worked with what the city already had — its roads, its vacant land, its existing settlements — rather than waiting for what it did not have. And in every case the technology was the easier half of the problem; the harder half was money, jurisdiction, continuity and consent.
5.8 Summary
Urbanisation and the rural–urban divide
- Urbanisation is the rise in the proportion of a population living in towns and cities. It differs from urban growth, which is the rise in the absolute number of city dwellers; a country can have rapid urban growth with little urbanisation if its rural population grows equally fast.
- Urban population increases from three sources: in-migration from rural areas, natural increase within towns, and the reclassification of settlements as urban.
- Migration is movement with the intention of settling. Internal migration, within a country’s borders, drives urbanisation in most of the developing world.
- “Third world” is a historical Cold War term for the poorer, largely formerly colonised countries of Asia, Africa and Latin America; the developing world, low- and middle-income countries and the Global South are the terms now more commonly used.
- Push factors operate at the origin — fragmented holdings, seasonal and uncertain farm work, drought and falling water tables, absence of schools and hospitals, and displacement by projects or disasters.
- Pull factors operate at the destination — higher and more continuous wages, varied work, easy entry into the informal sector, services, and networks of kin who arrived earlier.
- Rural consequences run both ways: loss of working-age labour, a rising share of farm work done by women, land left fallow or leased, and decline of some crafts; against this, remittances that are often a household’s largest cash income, higher rural wages, and skills brought back.
- Urban consequences follow from services arriving slower than people: informal settlements without secure tenure, water bought by the pot at a higher price per litre than metered households pay, congestion, stretched schools and drains, and building over natural drainage. Cities are nonetheless where productivity and incomes are highest; the “urbanisation of poverty” describes the shift of a country’s poor into cities, not a case against cities.
- Migration is reduced by raising rural incomes and reducing seasonality, creating rural non-farm work, bringing services within reach, and developing small and medium towns — and by planning for the migration that will happen anyway. Whether reducing migration is itself the right goal is genuinely contested.
- Projections show the world moving from roughly 30 per cent urban in 1950 to about 68 per cent by 2050, and India from about 17 per cent to about 50 per cent. A modest rise in a percentage applied to a very large base is an enormous rise in people, which is why planners work with absolute numbers.
Development and the conventional paradigm
- Development is a sustained improvement in the material and social conditions of life — income, health, education, services, opportunity — and not income alone. Economic growth is the increase in the value of output, conventionally measured as the annual change in Gross Domestic Product.
- Growth became the working definition of development because GDP is a single number, internationally comparable and frequently available. A measure with those advantages becomes the target.
- GDP deducts nothing for depletion of natural resources or for pollution, and shows nothing about distribution. Growth can therefore occur without development.
- Six environmental impacts follow from growth-led development: (a) negative environmental impacts are ignored because they are not in the accounts; (b) resource-use patterns shift from local need to market demand; (c) resources are used faster than they renew; (d) scarce resources are diverted to luxury uses because price rations by ability to pay; (e) access to resources and exposure to their costs fall on different populations; (f) wastes and pollution rise, and their composition shifts towards plastics, metals and hazardous components.
- Appraised for sustainability, the paradigm cannot distinguish income earned from a stock’s yield from income earned by liquidating the stock. Appraised for environmental impact, its silence on depletion and pollution is the root problem, though the composition and technology of growth matter as much as its rate. Appraised for equity, an average conceals a distribution — while the historical record does show that sustained growth has accompanied the largest reductions in extreme poverty.
- Intergenerational equity is the gap no market price can close, because those affected cannot bid.
The Gandhian approach
- The approach rests on decentralisation, limitation of wants, dignity of labour, non-violence extended to the means of production, and trusteeship of wealth.
- Sarvodaya is the uplift of all; antyodaya is its operating test — judge a policy by its effect on the poorest person it reaches. This behaves quite differently from an average.
- Gram swaraj is village self-rule, with authority flowing upward from the village. Panchayati Raj gives it institutional form in three tiers — Gram Sabha and Gram Panchayat at village level, Panchayat Samiti at block level, Zila Parishad at district level — and was given constitutional status by the Seventy-third Amendment of 1992, with reservation of seats and a five-year electoral cycle.
- Swadeshi — meeting needs from local production — carries a real environmental logic: less transport energy, local materials, organic residues returned to local soil, and quick feedback between polluter and sufferer. Its honest limit is that self-sufficiency forgoes the gains of specialisation and leaves a locality exposed to its own bad year.
- Cottage industries and intermediate technology — low capital per workplace, locally repairable, moderate output per worker — were chosen to convert idle labour into production where capital is scarce and labour abundant. The objection was never to machinery as such, but to machinery that displaces labour with nowhere to go.
- Employment is the purpose of production in this approach, not a by-product of it. Where labour is surplus, more welfare may be generated by employing many at moderate productivity than a few at high productivity.
- Its criticisms are substantial: lower productivity, the village’s own inequalities, goods that cannot be made at village scale. Its convergence with modern practice is striking — decentralised power, local water harvesting and small-scale sanitation have arrived on engineering and cost grounds.
Urban environmental problems
- A city’s services are networks: they must be built ahead of demand, in whole stretches, and serve nobody until complete.
- Sanitation is a chain — containment, emptying, transport, treatment, disposal — and fails at its weakest link. Sewerage needs abundant water, secure tenure and very large capital; on-site systems such as septic tanks are quick and cheap but fail at the emptying and disposal of sludge.
- Urban water suffers from source distance, non-revenue water lost through leaks and unbilled use, and intermittent supply, which contaminates the network by drawing in groundwater when pressure falls. Uncoordinated borewells draw aquifers down while paving reduces recharge, producing falling water tables and urban flooding together.
- Transport problems arise from a mismatch between modal share — most trips being on foot, by cycle and by public transport — and road space allocated mainly to private vehicles. Congestion multiplies emissions as well as delay.
- Energy problems are of peak demand, transmission and distribution losses, diesel generators substituting for unreliable supply, and the emissions carried by a coal-based fuel mix; energy poverty persists inside well-supplied cities.
- Air quality is worsened by ground-level sources, by street geometry that slows air movement, and by winter temperature inversions that trap pollutants near the ground. Exposure is highest for those who work and travel in the open.
- Housing determines environmental quality through tenure security: without legal recognition, households do not invest, utilities do not connect, and settlements occupy floodplains, slopes and drain edges.
- Indian urban areas generate roughly 0.4 to 0.6 kg of municipal solid waste per person per day.
- Constraints are economic — lumpy capital costs, weak municipal revenue, tariffs below cost, funds for building but not for operating — and political — fragmented agencies, planning boundaries narrower than the city’s real extent, electoral horizons shorter than asset life, and the unresolved legal status of settlements.
Indigenous solutions
- Imported solutions assume capital in advance, abundant water, regular layouts with secure tenure, technical staff and spare parts, cost-recovering tariffs, and gentle rainfall. Where these are absent, the technology underperforms — a failure of fit, not of engineering.
- Rainwater harvesting collects rain from roofs and paved surfaces for use or for recharge, through catchment, gutters, first-flush diverter, filter and either a storage tank or a recharge pit. Yield is \(V = A \times R \times C\); a 100 m² roof with 600 mm rainfall and a runoff coefficient of 0.8 yields about 48,000 litres a year.
- Segregation at source into wet, dry recyclable and domestic hazardous streams is the pivot on which everything else depends, because mixing destroys the value of all three. Indian municipal waste is roughly 45–55 per cent biodegradable, 20–30 per cent recyclable and 20–30 per cent inert.
- Composting is controlled aerobic decomposition, requiring a mix of nitrogen-rich and carbon-rich material, moisture, air and time; vermicomposting adds earthworms and needs more care, not less. It removes wet waste at source, cuts landfill methane and leachate, and returns organic matter to soil — provided the feedstock is clean and a market for the compost exists.
- Energy can be recovered by anaerobic digestion producing biogas (about half to two-thirds methane) and fertiliser slurry, by landfill gas recovery, or by thermal routes — incineration, gasification and pyrolysis, the last operating at several hundred degrees Celsius. Thermal routes suit dry, high-calorific waste; Indian waste is wet and mixed, and a plant guaranteed a daily tonnage has an interest working directly against segregation.
- Dry toilets — composting, urine-diverting and twin-pit types — operate without water or sewers and recover nutrients, but depend on correct daily use, adequate storage time for pathogen die-off, and mechanical design that removes the need for anyone to handle fresh waste.
- DEWATS treats sewage near where it is produced, by gravity and without power, through a settler, an anaerobic baffled reactor, an anaerobic filter and a planted gravel filter. It is quick, cheap to run and produces water reusable on site; it needs land, correct sizing, periodic sludge removal, and cannot handle toxic industrial effluent.
New urbanism, smart growth and the four examples
- Urban sprawl — low-density, single-use, car-dependent outward expansion — raises infrastructure cost per household, forces vehicle trips, increases runoff and consumes farmland and drainage land.
- New Urbanism proposes walkable neighbourhoods with a centre and edge, mixed land use, mixed housing types, connected street networks, streets built for people, transit-oriented density and good public space. Comfortable walking distance is 400–800 m.
- Smart growth states ten goals for where and how growth happens, including mixed use, compact design, housing choice, walkability, sense of place, conservation of open land, directing development into existing communities, transport choice, predictable decisions and community collaboration.
- Both were formulated for car-dependent low-density cities; much of what they recommend already exists in older Indian neighbourhoods, so the useful application here is often protection rather than importation. Density without services is unhealthy, and improvement can raise land values enough to displace the people it was meant to include.
- Bogotá, Colombia built bus rapid transit — dedicated lanes, prepaid level boarding, feeder services — with a cycle network and car-free Sundays, achieving mass transit quickly at a fraction of metro cost; corridors were later overcrowded and rail was returned to.
- Cuba built intensive urban organic agriculture, chiefly organopónico raised beds with compost and biological pest control, after imported fuel and farm inputs ceased in the early 1990s; it supplies much of the cities’ fresh vegetables but not staple grains, and is labour-intensive.
- Curitiba, Brazil planned transport and land use as one system from the mid-1960s — structural axes, the trinary road arrangement, highest densities along the transit corridors, tube stations with prepaid level boarding, floodplains kept as parks, and waste exchanged for bus tokens and food where trucks could not reach. Growth beyond the municipal boundary remained outside its control.
- Cochabamba, Bolivia granted a water concession in 1999; steep tariff increases and disputed rights over local sources led to months of protest in early 2000, injuries and one death, a state of emergency, and cancellation of the concession in April 2000. The transfer was reversed; the scarcity and the finance problem were not solved.
- Across all four, the response was shaped by a constraint rather than chosen from a catalogue, worked with what the city already had, and found the technology to be the easier half of the problem — money, jurisdiction, continuity and consent being the harder half.
5.9 Key Terms
- Antyodaya — the principle that a policy should be judged by its effect on the poorest and weakest person it reaches; the uplift of the last.
- Biogas — the gas mixture, about half to two-thirds methane with carbon dioxide, produced when organic waste is digested by micro-organisms without oxygen.
- BRT — Bus Rapid Transit.
- Bus rapid transit (BRT) — a bus system given metro-like characteristics: dedicated lanes, enclosed stations, payment before boarding, level entry and high frequency.
- Capital-intensive — using a high ratio of capital to labour in production.
- Composting — the controlled decomposition of biodegradable waste by micro-organisms in the presence of oxygen, producing a stable humus-like material.
- Cottage industry — a small-scale enterprise carried on in or near the home, using simple equipment, local or family labour and low capital per worker.
- Decentralisation — the distribution of decision-making authority away from a central body to local units.
- Development — a sustained improvement in the material and social conditions of life of a population, including income, health, education and access to services and opportunities, and not income alone.
- DEWATS — Decentralised Wastewater Treatment System (expanded in the syllabus as Decentralized Water Management System).
- Dry toilet — a toilet that works without water, containing and treating excreta where it falls; includes composting, urine-diverting and twin-pit types.
- Economic growth — the increase, over a stated period, in the total value of goods and services produced by an economy, conventionally measured as the annual percentage change in Gross Domestic Product.
- Faecal sludge — the settled solids accumulating in a septic tank or pit, which must be periodically emptied and treated.
- First flush — the initial runoff from a roof at the start of rain, carrying accumulated dust and debris, which is deliberately diverted away from a rainwater harvesting store.
- GDP — Gross Domestic Product.
- Gram Sabha — the general body of all registered voters of a village, and the base of the Panchayati Raj structure.
- Gram swaraj — village self-rule; a village governing its own affairs, with authority flowing upward from it rather than downward to it.
- Gross Domestic Product (GDP) — the total money value of the goods and services produced within a country in a year.
- Informal sector — the part of the economy made up of enterprises and jobs that are unregistered, outside labour regulation, and incompletely counted in official data.
- Intermediate technology — technology pitched between traditional hand tools and large-scale industrial machinery: low capital per workplace, locally repairable, and substantially more productive than hand methods.
- Internal migration — migration within a country’s own borders, from one village, district or state to another.
- Khadi — hand-spun and hand-woven cloth, the emblem of village industry in the Gandhian programme.
- Labour-intensive — using a high ratio of labour to capital in production.
- Leachate — the contaminated liquid draining out of a waste heap or landfill, capable of polluting groundwater.
- Migration — the movement of people from one place of residence to another with the intention of settling there, as distinct from travel, tourism or pilgrimage.
- Modal share — the proportion of all trips made by each mode of travel: walking, cycling, bus, rail, two-wheeler, car.
- New Urbanism — an urban design movement, formalised in the early 1990s, proposing compact, walkable, mixed-use neighbourhoods served by a fine, connected street network.
- Non-revenue water — water produced and put into a distribution network but never billed, lost through leakage, illegal connections, faulty meters and unbilled public use.
- On-site sanitation — sanitation in which excreta is contained on the plot where it is produced, as in a septic tank or lined pit, rather than carried away by sewers.
- Organopónico — a raised bed of soil and organic matter built on poor or paved urban ground, cropped intensively by organic methods; the characteristic form of Cuban urban agriculture.
- Panchayati Raj — the system of elected rural local self-government in India, operating through the Gram Panchayat, Panchayat Samiti and Zila Parishad.
- Peak demand — the highest level of demand for a service, such as electricity or water, reached during a day or season; capacity must be built to meet it.
- Pull factors — conditions at a destination that attract migrants, such as higher wages, varied work, services and existing networks of kin.
- Push factors — conditions at a place of origin that make staying difficult, such as fragmented holdings, seasonal work, drought or absence of schools and hospitals.
- Rainwater harvesting — the collection and storage of rainwater from a catchment such as a roof or paved surface, for use after treatment or for recharging an aquifer.
- Remittance — money sent home by a migrant worker to the household at the place of origin.
- Rural–urban divide — the gap between village and city in incomes, wages, services, infrastructure and opportunity.
- Sanitation — the safe management of human excreta and liquid waste through the whole chain of containment, emptying, transport, treatment and final disposal.
- Sarvodaya — the principle that the object of social and economic arrangements is the uplift and welfare of all members of society without exception.
- Security of tenure — a legally recognised right to occupy land or a dwelling; its absence deters household investment and discourages utilities from extending services.
- Segregation at source — separating waste into streams — wet, dry recyclable and domestic hazardous — at the point where it is generated, before collection.
- Septic tank — a sealed underground chamber in which solids from wastewater settle and partly decompose, the liquid overflowing to a soak pit or drain; not a treatment plant.
- Sewerage — the network of underground pipes that carries wastewater away from buildings to a treatment plant.
- Sewered sanitation — sanitation in which waste is carried away immediately from the point of use through a sewerage network to central treatment.
- Slum — an area of housing lacking secure tenure, durable structures, adequate space, safe water or sanitation, or some combination of these.
- Smart growth — a planning approach directing development into existing built-up areas, encouraging compact mixed-use development with a choice of transport modes and conserving open land at the urban edge.
- Storm water — rainfall running off roofs, roads and other surfaces, which urban drainage systems are built to carry away.
- Swadeshi — the principle of meeting needs as far as possible from goods produced in one’s own locality or country.
- Third world — a historical Cold War term for the poorer, largely formerly colonised countries of Asia, Africa and Latin America, now more usually called the developing world, low- and middle-income countries or the Global South.
- Urban growth — the increase in the absolute number of people living in towns and cities, as distinct from urbanisation.
- Urban heat island — the tendency of a built-up area to remain warmer than its surroundings, because paved and built surfaces absorb and release heat and vegetation is scarce.
- Urban sprawl — the low-density, single-use, car-dependent outward spread of a city into surrounding land.
- Urbanisation — the increase in the proportion of a population living in urban settlements, through migration, natural increase within towns and reclassification of settlements.
- Urbanisation of poverty — the shift of a large share of a country’s poor population from rural areas into cities.
- Vermicomposting — composting accelerated by earthworms, which fragment the material and pass it through their gut, producing a finer and richer product.
5.10 Points to Ponder
If a household’s income rises because a member left for the city, but the village loses a worker and the migrant lives in one rented room, has that household developed? Whose account should the gain and the loss be entered in?
A national output figure rises by six per cent while a river running through the country’s largest city becomes unfit for any use. What would an indicator have to measure for those two facts to appear in the same number?
Suppose a policy would raise the incomes of nine people substantially and leave the tenth exactly where they were. The growth test approves it and the antyodaya test does not. Which test would you want a government to apply, and would your answer change if the tenth person were made slightly worse off?
Older Indian neighbourhoods are dense, mixed in use and walkable — the very features New Urbanism recommends. Why, then, has so much new development in the same cities been built the opposite way?
A city can treat its sewage in one large plant or in two hundred small ones. The large plant is cheaper per litre treated; the small ones can be built next month. On what grounds should a city choose, and does the answer change if it expects to double in size within twenty years?
Cuba’s urban agriculture began because imported fuel and fertiliser disappeared. Curitiba’s transport system began because a plan was adopted before the pressure arrived. Is a constraint or a plan the more reliable source of good environmental decisions — and what does your answer imply about cities that have neither?
5.11 Objective Questions
- Urbanisation is best defined as:
- the increase in the total number of people living in cities
- the increase in the proportion of a population living in urban settlements
- the outward expansion of a city onto surrounding farmland
- the movement of people from one city to another [1 mark]
- Which of the following is a pull factor rather than a push factor?
- A falling water table that has dried up the village well
- Fragmentation of landholdings between brothers
- Easy entry into informal work such as vending or construction labour
- Absence of a secondary school within reach [1 mark]
- Water that a utility produces and puts into its distribution network but never bills to any customer is called:
- intermittent supply
- leachate
- non-revenue water
- peak demand [1 mark]
- The stage of a DEWATS treatment train in which plant roots supply oxygen to the treatment medium is the:
- settler
- anaerobic baffled reactor
- anaerobic filter
- planted gravel filter [1 mark]
- Approximately what share of municipal solid waste in Indian cities is biodegradable by weight?
- about 10 per cent
- about 25 per cent
- about 50 per cent
- about 85 per cent [1 mark]
- The term for the principle that a policy should be judged by its effect on the poorest person it reaches is:
- swadeshi
- antyodaya
- gram swaraj
- trusteeship [1 mark]
- Assertion (A): A city can install a very large number of toilets and still discharge almost all of its excreta untreated. Reason (R): Sanitation is a chain of containment, emptying, transport, treatment and disposal, and it is only as effective as its weakest link.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true. [1 mark]
- Assertion (A): An intermittent piped water supply can contaminate its own water. Reason (R): When a pipe is not under pressure, polluted groundwater around it can be drawn in through cracks and joints.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true. [1 mark]
- Match the city in Column A with the measure associated with it in Column B.
| Column A | Column B |
|---|---|
| a. Bogotá | i. Structural growth axes with the highest permitted densities along dedicated bus corridors |
| b. Cuba | ii. Cancellation of a private water concession after sustained public protest |
| c. Curitiba | iii. Bus rapid transit with prepaid, level boarding, together with a citywide cycle network |
| d. Cochabamba | iv. Intensive urban vegetable production in raised organic beds |
[1 mark]
Fill in the blank: The initial runoff from a roof at the start of a rain event, which carries accumulated dust and debris and is deliberately diverted away from storage, is called the ____________. [1 mark]
State whether the following statement is true or false: Composting is the decomposition of biodegradable waste by micro-organisms in the absence of oxygen. [1 mark]
Give the full form of each of the following abbreviations used in this chapter: (i) GDP (ii) BRT (iii) DEWATS. [1 mark]
5.12 Check Your Concepts
Define urbanisation, and state one way in which a city’s urban population can grow without any person migrating into it. [2 marks]
Define security of tenure and state one reason why it affects the environmental quality of a household’s surroundings. [2 marks]
What is meant by segregation at source? Name the three streams into which household waste is usually separated. [2 marks]
Differentiate between economic growth and development, giving one indicator used for each. [3 marks]
Differentiate between sewered sanitation and on-site sanitation with respect to capital cost, water requirement and the point at which each is most likely to fail. [3 marks]
Give reasons for the following: a city with falling water tables may find that fixing leaks in its distribution network is a better first step than developing a new water source. [3 marks]
Explain, with one example each, any three of the six environmental impacts that follow from treating development as synonymous with growth. [4 marks]
Explain what intermediate technology is, and evaluate the claim that it is always preferable to large-scale industrial technology in a labour-surplus economy. [4 marks]
Draw and label a diagram of a rooftop rainwater harvesting system, and explain the function of the first-flush arrangement and of the recharge structure. [4 marks]
Describe the DEWATS approach to sewage management: its four treatment stages in order, three advantages it offers a city that cannot finance a trunk sewerage network, and two of its limitations. [6 marks]
Compare the Gandhian approach to development with the conventional paradigm of growth, with reference to their objectives, their preferred scale of production and technology, their treatment of employment, and one serious criticism of each. [6 marks]
Discuss the consequences of large-scale rural-to-urban migration for the rural sector and for the urban sector, using Indian examples, and state two measures by which distress migration may be reduced. [6 marks]
5.13 Passage-Based Questions
- A town of about two lakh people has laid piped water to roughly half its households. The utility supplies water for two hours each morning. Its records show that a large fraction of the treated water put into the mains is never billed. Households in the unconnected half buy from private tankers, paying several times as much per litre as metered households. Meanwhile, private borewells across the town have multiplied, and the water table has fallen steadily for a decade.
- Name the phenomenon described in the third sentence and explain how it arises. [2 marks]
- Explain why supplying water for only two hours a day can worsen the quality of the water delivered. [2 marks]
- Suggest, with reasons, two measures the town could take before developing a new distant source. [2 marks] [6 marks]
- A ward committee installs 200 new household toilets in a dense low-income settlement. Each toilet discharges into a septic tank built on the plot. Two years later, tests of the shallow wells that many households still use show heavy faecal contamination, and the open drains at the edge of the settlement run continuously with grey, foul-smelling liquid. The nearest sewage treatment plant is eleven kilometres away and has spare capacity.
- Identify which link of the sanitation chain has failed here, and explain how you reached that conclusion. [2 marks]
- Explain why the spare capacity at the distant treatment plant has not helped this settlement. [2 marks]
- Suggest one service and one decentralised technical option that would address the problem, giving one limitation of the option you choose. [2 marks] [6 marks]
- A district authority proposes a new township on 400 hectares of farmland eight kilometres beyond the edge of an existing city. The plan places housing in one zone, a commercial complex in a second, and a school and hospital in a third, connected by two wide arterial roads with no footpaths or cycle tracks. The layout uses cul-de-sacs within each zone. The developer argues that land is cheaper at this distance and that residents will use private vehicles anyway.
- Name the pattern of development described and list three of its features present in this plan. [3 marks]
- Explain two environmental costs this layout will impose that would not arise from a compact, mixed-use layout of the same population. [2 marks]
- State two goals of smart growth that this proposal violates, and explain how each is violated. [2 marks] [7 marks]
5.14 Practice With Data
A household has a flat terrace of area 120 m². The annual rainfall at the location is 750 mm and a runoff coefficient of 0.8 may be assumed. (i) Calculate the volume of rainwater that could be harvested in a year, in cubic metres and in litres. (ii) If the household of six persons uses 135 litres per person per day, calculate what percentage of its annual water requirement the harvested rainwater could meet. Show all working with units. [4 marks]
A country’s population rises from 90 crore to 117 crore over thirty years, while its urban share rises from 28 per cent to 42 per cent. (i) Calculate the urban population at the beginning and at the end of the period. (ii) Calculate the increase in the urban population and express it as a percentage of the starting urban population. (iii) State what this comparison shows about the difference between a change in urban share and a change in urban numbers, and why the distinction matters to a planner. [4 marks]
Study the following data for a city of 25 lakh people.
| Item | Value |
|---|---|
| Municipal solid waste generated | 0.5 kg per person per day |
| Biodegradable fraction | 50 per cent by weight |
| Recyclable fraction | 25 per cent by weight |
| Waste currently collected as mixed waste | 100 per cent |
(i) Calculate the total waste generated per day, in tonnes. (ii) Calculate the mass of biodegradable waste that could be composted daily if segregation at source were complete, in tonnes. (iii) Explain why the recyclable fraction is worth far less when it is collected as mixed waste. [4 marks]
- Two lines are plotted for a country over forty years on the same axes: one is an index of Gross Domestic Product, which rises steadily from 100 to 340; the other is an index of forest area and mean groundwater level, which falls steadily from 100 to 72. (i) State what the widening gap between the two lines represents. (ii) Explain why the first line can rise while the second falls, with reference to what GDP does and does not deduct. (iii) Suggest one indicator that would capture what this pair of lines shows, and state one difficulty in constructing it. [4 marks]