In 2014 residents living on the Somerset Levels accused the government of not preventing the flooding by failing to dredge the rivers and drainage ditches that criss-cross the land. How might this lack of dredging have contributed to the floods?

Flooding is a natural part of the yearly cycle of a river, creating flood plains, levees and various other features. Floods occur when the discharge volume of the river becomes too large for the channel to contain.  Before the Neolithic Age, during the winter hunter-gatherer populations would have retreated to higher grounds, only returning when the risk of flooding had passed. In later times we began to attempt flood management. In the 3rd and 4th millennium BC humans started creating canals, dams and channels to try and control the flow of the river. Since then we have been trying to... Show more

Flooding is a natural part of the yearly cycle of a river, creating flood plains, levees and various other features. Floods occur when the discharge volume of the river becomes too large for the channel to contain. 

Before the Neolithic Age, during the winter hunter-gatherer populations would have retreated to higher grounds, only returning when the risk of flooding had passed. In later times we began to attempt flood management. In the 3rd and 4th millennium BC humans started creating canals, dams and channels to try and control the flow of the river. Since then we have been trying to manage and control river flow to prevent flooding. Until recently hard engineering systems were used, but lately the value of soft engineering to reduce the flood risk has been realized.

Now that there are settlements built in the high risk areas for flooding, the management of rivers is a must if we want to prevent homes from flooding. For governments with a limited budget, even in MEDCs (more economically developed countries), cost effective protection from flooding is a growing area of science.

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