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Words to use to help: Surfaces. Urbanisation. Floods.  Building. Increase. Population density. Soil erosion.

can cause flooding because many of the in towns and cities are Impermeable. The whole urban system is designed to move water from the surface into underground pipes and away from urban areas which have value. This can lead to in other regions.

Deforestation (the removal of trees) can increase , reduce interception and flood risk.

Increases in can also have an impact as it places more people in flood risk areas. It is for this reason that we are on floodplains and flood risk areas in the UK, this just increases the likelihood of a flood.