The big idea: Urban resilience is a city's ability to absorb shocks and stresses — floods, heatwaves, economic decline, rapid growth — and keep functioning and recovering.
Infrastructure is the physical and service backbone a city runs on: transport, water, sanitation, energy, waste, housing and communications.
Urban governance is who decides and how — the mix of city government, national policy, private firms, NGOs and residents that plans, funds and runs the city. Good governance is what turns money and ideas into resilient infrastructure that actually reaches people.
Key terms
- Urban resilience — the capacity to cope with and bounce back from shocks (climatic, economic, social).
- Infrastructure — transport, water, sanitation, energy, waste, housing and digital networks.
- Infrastructure upgrading — improving or extending existing systems (e.g. retrofitting old pipes, adding metro lines).
- Urban governance — how a city is run and decisions are made across government, business, NGOs and citizens.
- Future-proofing — designing today's infrastructure to cope with future climate and population pressures.
- Urban deprivation — long-term concentrated poverty, poor housing and weak services in parts of a city.
Growth and infrastructure are two-way: Urban growth drives demand for new infrastructure — and the infrastructure that exists shapes how and where a city can grow.
When growth outpaces infrastructure (common in fast-growing megacities), services break down: traffic, water shortages, untreated waste, informal housing.
How this is tested: Paper 1 Option G asks you to Explain two challenges that make it hard to improve or upgrade infrastructure in a fast-growing town — a structured 3+3 explain (1 mark for the challenge + up to 2 for development/an example). Name the challenge, then develop why it blocks or slows the upgrade.
| Challenge | Why it blocks or slows the upgrade |
|---|---|
| Land is already built on | New roads, runways or pipes need space the city has already used, forcing resettlement of residents |
| Resettlement and sprawl | Moving people pushes development outwards, adding sprawl and the cost of compensation and rehousing |
| Ageing systems | Old pipes, cables and roads (common in high-income cities) are costly to dig up and replace under a working city |
| Site restrictions | Steep relief, rivers, coastlines or protected land limit where new infrastructure can physically go |
| Opposition | Residents, pressure groups and businesses object (noise, disruption, displacement), causing delay |
| Cost and funding | Major upgrades need huge capital that fast-growing or low-income city governments may not have |
| Planning limits | Permits, environmental rules and slow approval processes hold projects up for years |
Answering an 'Explain two challenges' [6]
- Name the challenge (e.g. land is already in use).
- Develop the mechanism — why it makes upgrading hard (a new runway needs residential land, forcing resettlement).
- Add an example or consequence (sprawl, compensation costs, delay). 3 marks per challenge: 1 + 2.
Develop, don't just list: Two named challenges with no development scores only 2/6. Land in use -> residents resettled -> compensation cost + sprawl is a developed point. Always give the knock-on effect.
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Urban growth and infrastructure are interdependent. Rapid growth in megacities strains infrastructure faster than it can be built — water, sanitation and transport buckle. In high-income cities the problem is ageing infrastructure struggling to serve a growing or changing population. The way out is integrated, well-governed planning that builds infrastructure ahead of, not behind, demand.
Lagos, Nigeria — growth outpacing infrastructure: Lagos is one of the world's fastest-growing megacities. Population growth has run far ahead of roads, drainage, water and waste systems, so traffic, flooding and informal settlements are widespread.
Effect: a clear case of growth straining infrastructure — large projects (the Lekki–Epe expressway, the Blue Line rail) try to catch up, but demand keeps rising faster than supply.
Curitiba, Brazil — infrastructure shaping growth: Curitiba planned its Bus Rapid Transit (BRT) corridors first, then concentrated dense building along them.
Effect: the infrastructure deliberately shaped the growth — strong governance steered the city into compact, transit-served corridors instead of sprawl, a model copied worldwide.
Detroit, USA — decline, deprivation and governance: Detroit lost much of its car industry and population, leaving ageing infrastructure serving far fewer people and concentrated long-term deprivation.
Effect: governance had to manage shrinkage — demolishing abandoned blocks, consolidating services and investing in the centre — showing infrastructure and growth (or decline) move together.
How this is tested — the [10] Examine essay: Paper 1 Option G sets a 10-mark Examine essay on the interrelationships between urban growth and infrastructure development, marked on markbands.
Top band needs: types of infrastructure (transport, waste, clean water), how rapid growth strains infrastructure in megacities and ageing systems in high-income cities, named examples, and a weighing of how the two shape each other — with a clear conclusion.
Resilient-city design: Resilient-city design builds cities that can cope with climatic and other shocks: flood defences and sustainable drainage, land-use zoning that keeps building off flood plains, green space that cools the city and soaks up rain, clean-air measures, and future-proofing for hotter, wetter conditions.
Its limits are real too: it is expensive, and in fast-growing, low-income cities there is rarely the money or land to do it well.
| Strength | Weakness |
|---|---|
| Flood defences and drainage cut flood damage | High capital cost — many city governments cannot afford it |
| Zoning keeps building off flood plains | Rapid growth means people settle anyway, in informal areas |
| Green space cools the city and absorbs rain | Land for parks competes with housing demand |
| Future-proofing reduces long-term repair costs | Low incomes mean residents cannot pay for upgrades |
| Strong governance coordinates stakeholders | Weak governance leaves plans unfunded or unenforced |
Singapore and Barcelona — resilient design done well: Singapore uses the Marina Barrage and ABC (Active, Beautiful, Clean) Waters programme to manage floods and store fresh water, plus extensive green roofs to cool the city.
Barcelona's superblocks (superilles) reclaim road space for pedestrians and greenery, cutting traffic pollution and adding shade and rain-absorbing surfaces. Both show resilient design working — but both are wealthy, well-governed cities.
How this is tested — the resilience [10] essay: Paper 1 Option G also sets a 10-mark Examine essay on resilient-city design as a response to climatic challenges, marked on markbands.
Top band needs an evidenced explanation of the strengths (flood defences, zoning, green space, future-proofing) and the weaknesses (cost, rapid growth, low incomes), named examples, and a balanced, justified evaluation.