Check dams

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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. are small dams or weirs constructed across a drainage ditchA long narrow trench or furrow dug in the ground, as for irrigation, drainage, or a boundary line., swaleA shallow constructed channel, often grass-lined, which is used as an alternative to curb and channel, or as a pretreatment to other measures. Swales are generally characterized by a broad top width to depth ratio and gentle grades., or channel to lower the speed of concentrated flows for a certain design range of storm events and to promote infiltrationThe slow movement of water into or through a soil or drainage system.Penetration of water through the ground surface..

  • 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. See: Sizing
  • 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.

Sizing

Check dams: Sizing