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Chapter 2 – Dry Extended Detention Basin

VDOT BMP Design Manual of Practice i Chapter 2 Dry Extended Detention Basin Chapter 2 Dry Extended Detention Basin TABLE OF CONTENTS Overview of Practice .. 1 Site Constraints and Siting of the Facility .. 2 Minimum Drainage Area .. 2 maximum Drainage Area .. 5 Separation Distances .. 5 Site Slopes .. 5 Site Soils .. 6 Rock .. 6 Existing Utilities .. 6 Karst .. 6 Wetlands .. 6 Upstream Sediment Considerations .. 7 Floodplains .. 7 Basin Location .. 7 General Design Guidelines .. 8 Foundation and Embankment Material .. 8 Outfall Piping .. 8 Embankment .. 8 Embankment 9 Prevention of Short-Circuiting .. 9 Ponded Depth .. 9 Principal Spillway Design .. 9 Emergency Spillway Stabilization .. 10 Fencing .. 10 Sediment Forebays .. 10 Discharge Flows .. 10 Design Process .. 11 Step 1.

The maximum drainage area to an extended dry detention facility is frequently restricted to no more than 50 acres. When larger drainage areas are directed to a single facility, often there is a need to accommodate base flow through the facility. When no permanent pool is proposed, as with a dry extended detention basin, the presence of

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