This fact sheet details the benefits, design factors and target pollutants of dry or ephemeral detention areas.
Design Scale: District, Lot
Dry or ephemeral detention areas are depressions that temporarily hold stormwater and release it at a slower rate than it comes in. They reduce flow velocities and so help prevent downstream erosion. They also reduce downstream flow rates.
Dry or ephemeral detention areas improve stormwater quality primarily by allowing sedimentation of particle-based contaminants. They are termed ‘dry or ephemeral’ as their lowest point is located above the maximum groundwater level. They drain after each storm event to provide the full storage volume for the next one.
This fact sheet details the benefits, design factors and target pollutants of this WSUD asset.
Our focus areas
Supporting community wellbeing and healthy environments within resilient and sustainable places throughout Western Australia.
