Note that your final mark will not be saved in the system.
What are the challenges in river landscapes, and how can they be managed? Typeit
Type the correct answers into the spaces. Fill all the spaces before clicking ‘Check Answers!’
Our risks of flooding are increasing. In recent years, we have seen a lot of winter , often in quick succession. Rain falls on ground that is already saturated. We call the prior conditions of the catchment moisture. When rainfall lands on saturated ground, there is no room for the rain to into the soil, so water pools on the surface in depressions, and flows directly into rivers. But we often see summer flooding - during spells of bad weather, or in some cases rapid floods called floods where rainfall is intense and water pours down a narrow valley such as at Boscastle. Humans could be increasing the frequency and severity of floods through change.
We are putting ourselves at risk when we build on flood - although modern planning prohibits this. There are still plenty of properties that have already been built there, and we are at greater pressure than ever to build new houses because of population . We are also changing the use of the land. Every time we build new houses and roads, we install storm which transport runoff from roofs and roads directly into rivers, unless we install soakaways, which allow the rainfall to soak slowly into the ground, reducing flood risk down stream. Cutting down trees is called , and this increases flood risk because interception is .