Changes

Check dams are small dams or weirs constructed across a drainage ditch, swale, or channel to lower the speed of concentrated flows for a certain design range of storm events and to promote infiltration.  

Check dams are small dams or weirs constructed across a drainage ditch, swale, or channel to lower the speed of concentrated flows for a certain design range of storm events and to promote infiltration.  

{{plainlist|1=

{{plainlist|1=Check dams:

*Check dams usually consist of crushed rock gabions, or pre-treated timber up to 0.6 m in height.  

*may be constructed of any resilient and waterproof material, including: rock gabions, earth berms, coarse aggregate or rip-rap, concrete, metal or pre-treated timber. Rocks used in check dams should have median diameter 25-75 mm.  

*Rocks used in check dams should have median diameter 25-75 mm.  

*are used, up to 0.6 m in height; the maximum design depth of ponded water must be ≤ 0.6 m.

*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 dams are used, the maximum design depth of ponded water must be 0.5 m.}}

*are usually installed between 10-20 m along the swale. 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.  

*should have energy dissipation and erosion control measures installed in the 1 - 2 m downstream. Examples include large aggregate or [[Turf reinforcement|turf reinforcement]]}}

 

==Sizing==

==Sizing==

{{:Check dams: Sizing}}

{{:Check dams: Sizing}}