Ian McHarg: Design with Nature

Key points

Design with Nature (1969) introduced an ecological approach to urban and regional planning.
McHarg starts from the premise that ignoring natural systems produces unsustainable cities.
His method overlays maps of geology, hydrology, soil and vegetation to decide where and how to build.

Design with Nature (1969), by Ian McHarg (1920–2001), a Scottish landscape architect and professor at the University of Pennsylvania, is the book that founded ecological planning. Its thesis is simple and was revolutionary: urban and regional development must integrate with the natural environment rather than oppose it. Starting from a detailed analysis of natural processes, McHarg proposes planning that respects nature and works with it instead of trying to dominate it, and that vision has shaped landscape architecture, urban planning and sustainability ever since.

Designing against nature is expensive

McHarg starts from the observation that traditional urban design has ignored natural systems, and that this neglect has produced unsustainable cities and environmental degradation: neighbourhoods built on floodplains, fertile soils sealed over, unstable slopes developed. The key to development that works lies in understanding and respecting the natural characteristics of a place — geology, climate, hydrology, soils, biodiversity — and in adapting the project to those conditions rather than imposing a rigid structure on them, preserving vital ecosystems and minimising human impact.

Overlay maps: reading the site

His most influential method is site analysis through overlay maps. By drawing each aspect of the territory on transparent layers — soil quality, slopes, vegetation, flood risk, agricultural value, scenic value — and stacking them, the planner sees where building is appropriate and where it is not, and which areas should be preserved. That layered analysis, done by hand in 1969, is the conceptual forerunner of the geographic information systems that now underpin planning and environmental management; McHarg formulated the method before the tool existed.

From the city to the region

Design with Nature does not stop at the city: it addresses design at large scale, whole regions and rural landscapes. McHarg argues that planning must take into account the ecological processes operating at regional scale — a watershed, a coastline — and that no human intervention can be separated from that context. His approach includes preserving natural areas and also restoring damaged ecosystems, to improve long-term environmental resilience. The Woodlands, near Houston, planned by his firm in the 1970s around natural drainage, was his practical demonstration.

A lasting influence

The impact of his ideas has been profound. They shaped the birth of sustainable planning and the integration of ecological principles into the design of cities and territories, and they are applied today in green infrastructure, watershed management, ecological zoning and the design of climate-resilient cities. Every time a plan starts with the flood map rather than the zoning map, it is following McHarg.

Design with Nature represents a paradigm shift in how urban development is conceived. By integrating natural systems into the design of cities and territories, McHarg laid the foundations of planning that respects the environment and is aware of ecological limits, and his invitation — to design with nature, not against it — is today, with the climate changing, more necessary than when he wrote it.

Climate & nature Flooding Latin America Zoning Resilience Rent

Guide · Cities and climate change

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Flooding Urban flooding happens when rain falls on an impermeable city —roofs, asphalt, concrete— and water that no longer infiltrates runs to the lowest point faster than sewers can swallow it.
Latin America Latin America is the most urbanised region in the world after North America —more than 80% of its population lives in cities— and the one that urbanised fastest in the twentieth century: from rural-urban migration to the ten-million metropolis in two generations.
Zoning Zoning is the planning technique that divides land into zones and sets for each what may be built: use (housing, industry, retail), height, floor area and coverage.
Resilience Urban resilience is a city's capacity to absorb a shock —flood, earthquake, pandemic, economic crisis— and keep functioning, recover and reorganise without losing what is essential.

Frequently asked questions

What does Design with Nature propose?

That planning should start from knowledge of the territory — geology, climate, hydrology, soil, biodiversity — rather than impose a design on it. McHarg overlays maps of each factor to identify where building is appropriate and where it is not, a method that anticipates GIS.

Why does McHarg still matter?

Because he founded ecological planning: his ideas shaped sustainable planning, green infrastructure and the integration of environmental principles into land-use decisions. Half a century later, climate adaptation in cities still follows his method.