8,254
edits
Changes
Jump to navigation
Jump to search
mLine 8:
Line 8:
no edit summary
*incorporating into parks and other green recreational spaces,
*incorporating into parks and other green recreational spaces,
*distributing across a larger development site}}
*distributing across a larger development site}}
==Planning considerations==
Where temporary storage of water occurs on the surface the depth and rate of rise of the water should be sufficiently low that risks posed by the water body are minimized for site users (taking into account the temporary nature of the storage facility which will mean that the public are not accustomed to its presence). A risk assessment should be undertaken of the frequency and rate of flooding to a range of inundation depths in order that public safety is not jeopardised. <ref>Ballard, B. W., Wilson, S., Udale-Clarke, H., Illman, S., Scott, T., Ashley, R., & Kellagher, R. (2015). The SuDS Manual. London.</ref>
==Design==
==Design==
The bottom of a dry pond should be flat to encourage uniform ponding and infiltration across the entire surface. Recommended tolerance on base levels 10 mm in 3m.
The side slopes should be no steeper than 1:3 to permit vegetation stabilization and access for maintenance and amenity. This may be relaxed where the pond area is very shallow (0.5 m). stepped or benched slopes are also a possibility, but consideration should be made of maintenance access. <ref>Ballard, B. W., Wilson, S., Udale-Clarke, H., Illman, S., Scott, T., Ashley, R., & Kellagher, R. (2015). The SuDS Manual. London.</ref>
===Volume===
===Volume===
The surface storage volume of a dry pond (''A<sub>p</sub>'') is determined:
The surface storage volume of a dry pond (''A<sub>p</sub>'') is determined: