Hard Engineering - RIVERS 0.0 / 5 ? GeographyCoastal zonesGCSEAQA Created by: user123Created on: 03-05-19 13:12 Dams Huge walls built across rivers, usually in upper course 1 of 14 Reservoir Formed behind the dam 2 of 14 Embankments Raised walls build along a river bank 3 of 14 Flood relief channels Channels built that divert water around important areas or take it elsewhere if water level in river becomes too high 4 of 14 2 benefits of reservoirs 1- store water and reduce flood risk. 2- water can be drinking water and used to generate HEP 5 of 14 2 Disadvantages of dams expensive and creating reservoir can flood existing settlements 6 of 14 1 disadvantage of reservoirs eroded material deposited in reservoir so farmland downstream becomes less fertile 7 of 14 channel straightening river course is straightened. Meanders are cut out by building artificial straight channels. 8 of 14 benefit of channel straightening reduces flood risk as water moves out area quicker 9 of 14 2 disadvantages of channel straightening more erosion downstream and flooding may happen downstream 10 of 14 benefit of embankments less frequent flooding 11 of 14 disadvantage of embankments expensive and risk of severe flooding if water rises above level of embankments 12 of 14 benefits of flood relief channels prevents flooding because river discharge reduced and water release is controlled by gates 13 of 14 disadvantages of flood relief channels increased discharge where relief channel rejoins river which can cause flooding. 14 of 14
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