Transcription of Chapter 2 – Dry Extended Detention Basin
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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. Compute the Required Water Quality Volume .. 11 Step 2. Estimate the Volume Required for Mitigation of Post-Development Runoff Peaks to Equal or Less than Pre-Development Levels.
Table of Contents VDOT BMP Design Manual of Practice ii Chapter 2 – Dry Extended Detention Basin Step 4. Development of Storage Versus Elevation Data ..... 19
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