Page 131 - Enfield SuDS DESIGN & EVALUATION
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Raingardens
The raingarden concept was pioneered in Key aspects of raingarden design include:
Prince George’s County, Maryland, USA in 1. gentle side slopes with water collected at
1990 when small stormwater basins were the surface
proposed for individual houses to replace 2. a free-draining soil, sometimes with an Detailed Design
larger regional stormwater ponds. underdrain to avoid permanent wetness
Raingardens are designed to collect and 3. a minimum of 450mm improved topsoil
manage reasonably clean water from roofs with up to 20% course compost
and low risk drives and pathways, has been 4. garden plants that can tolerate occasional
used where community or private care is submersion and wet soil – this includes
available to maintain these potentially most garden plants other than those
particularly adapted to dry conditions
attractive site features.
5. an overflow in case of heavy rain or
impeded drainage.
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Enfield Council SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates
