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Water Portal / Rainwater Harvesting / Groundwater recharge / Leaky dams

418 bytes added, 16:49, 19 April 2012

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|drought_text=- ''Effects of drought'': Less water stored behind dam. <br> - ''Underlying causes of effects'': Less recharge. <br> - ''To increase resiliency of WASH system'': Reduce water loss behind by using adjustable sheets filled with small size gravel on the upstream side of the dam.

|flood_text= xxxLeaky dams are meant to handle flash flood rain events. Very intense rain events could provide faster erosion or carry sediment loads beyond the dam (contrary to the dam's purpose of filtering silt). Or if the rain is slow and long, greater water amounts could add greater silt behind the dam in a shorter amount of time. In these cases, more attentive maintenance is required to check for erosion and silt build ups (or escapes).

}}

Good practice is somewhat similar to that for a [[sand dam]].

* Ensure they are not built in an area where water will bypass the structure. Riverbanks should be equal in height and tall enough (height of dam + height of flood +10%), and dam should not be constructed near the bend in a river.

* Site where river is narrower, so that construction is cheaper.

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Winona

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