This brochure provides information on dry or ephemeral detention areas and where they can be used in the water sensitive urban design process.
Dry or ephemeral detention areas are depressions that temporarily hold stormwater and release it at a slower rate than it comes in. These reduce downstream flow rates and decrease flow velocities and help prevent downstream erosion. Dry or ephemeral detention areas improve stormwater quality by allowing sedimentation of particle-based contaminants. These are termed 'dry or ephemeral' as their lowest point is located above the maximum groundwater level and drain after each storm event to provide the full storage volume for the next storm.
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