Check dams

From LID SWM Planning and Design Guide
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Check damsStructures constructed of a non-erosive material, such as suitably sized aggregate, wood, gabions, riprap, or concrete; used to slow runoff water. Can be employed in practices such as bioswales and enhanced grass swales. usually consist of crushed rock gabions, or pre-treated timber up to 0.6 m in height. Rocks used in check damsStructures constructed of a non-erosive material, such as suitably sized aggregate, wood, gabions, riprap, or concrete; used to slow runoff water. Can be employed in practices such as bioswales and enhanced grass swales. should have median diameter 25-75 mm. The spacing of dams should not exceed the horizontal distance from the toe of the upstream dam to the same elevation on the downstream dam. Where check damsStructures constructed of a non-erosive material, such as suitably sized aggregate, wood, gabions, riprap, or concrete; used to slow runoff water. Can be employed in practices such as bioswales and enhanced grass swales. are used, the maximum design depth of ponded water must be 0.5 m.