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Water Portal / Rainwater Harvesting / Groundwater recharge / Leaky dams

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[[Image:leaky dams icon.png|right|80px]]

[[Image:LeakyDam.jpg|thumb|right|200px|'''Leaky dam.''' Re-hydrating the earth by sustainable, small-scale sub-surface water retention techniques, Vietnam. Photo: Partners voor Water (2009).]]

A floodwater harvesting technique, ~~these~~ '''leaky dams''' are permeable structures built across seasonal riverbeds which retain flash flood water that has a high silt load. The idea is to retain the high-energy floods and stimulate settlement of suspended sediment behind the dam. Water with a lower sediment load is then available to leak through the dam and infiltrate the downstream riverbed which is not blocked by sediment deposits. They have been proven to be able to recharge local aquifers. Leaky dams are excellent in semi-arid areas since they greatly reduce evaporation, in regards to storing water.

Implementation of this technology must be accompanied by other interventions. These include the strict protection and complete control of grazing along with extensive watershed management in the catchments to reduce the sedimentation loads in the reservoirs as well as enhancing the natural recharge of precipitation. Shrubs and local plants may be planted to help break up the soil (with their root systems) so that infiltration is easier.

Winona

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