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Water Portal / Rainwater Harvesting / Groundwater recharge / Sand dam

348 bytes added, 21:04, 18 April 2012
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|drought_text=- ''Effects of drought'': Can dry up; Water yields low. <br> - ''Underlying causes of effects'': Less recharge of aquifer due to less rainfall. <br> - ''To increase resiliency of WASH system'': Competent siting & construction; Build sand dam in stages to reduce silt.
|flood_text= Sand dams require careful maintenance, and immediate repair, as flooding causes hundreds of tons of water to fall over the dam wall and onto the spill-over apron. Flood water may also spill over and erode the wing walls and, perhaps, even over the riverbanks during heavy rains. When determining the dam and spillway height at the selected location, it is very important that the water level and flood line remain below the riverbanks after construction of the dam, or that flooding will not lead to problems up or downstream of the dam. If the flood level is higher than the riverbanks, construction of a dam is not advisable.
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[[Image:Sand dam flood.JPG|thumb|right|250px|Sand dam during flooding]]
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