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Line 72: − − ==Gallery== − {{:Check dams: Gallery}} − ==External references== − [http://www.fao.org/docrep/006/ad082e/AD082e02.htm FAO] − − [[Category:Calculations]]
→External References
{{Textbox|1=Check dams:
{{Textbox|1=Check dams:
*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. [[Stone]] used in check dams should have minimum median diameter 25 - 75 mm.
*may be constructed of any resilient and waterproof material, including: rock gabions, earth [[berms]], coarse aggregate or rip-rap, concrete or metal. [[Stone]] used in check dams should have minimum median diameter 25 - 75 mm.
*for enhanced [[swales]] may be up to 0.6 m in height; the maximum design depth of ponded water should be ≤ 0.6 m.
*for enhanced [[swales]] may be up to 0.6 m in height; the maximum design depth of ponded water should be ≤ 0.6 m.
*designed for higher flow velocities should have spillways incorporated into their profile, to direct water to the centre of the swale.
*designed for higher flow velocities should have spillways incorporated into their profile, to direct water to the centre of the swale.
So the four check dams will be 0.6 m high and spaced every 8.4 m along the swale. These are fairly close together, but this construction is achievable and the dimensions are not remarkable, given the change in gradient is an order of magnitude.
So the four check dams will be 0.6 m high and spaced every 8.4 m along the swale. These are fairly close together, but this construction is achievable and the dimensions are not remarkable, given the change in gradient is an order of magnitude.