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{{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.
*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.
*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]]}}
*should have energy dissipation and erosion control measures installed in the 1 - 2 m downstream. Examples include large aggregate or [[Turf reinforcement|turf reinforcement]]}}
The objective of these design recommendations are to maximize the distribution of ponded water along the whole BMP. Detailed design may require iteration of the dam heights and distances along each section of a long swale.
The objective of these design recommendations are to maximize the distribution of ponded water along the whole BMP. Detailed design may require iteration of the dam heights and distances along each section of a long swale.
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To estimate the depth of water that can be infiltrated into a surface within a given time:
To estimate the depth of water that can be infiltrated into a surface within a given time: