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.
2.2 - Site Constraintsand Siting of the Facility . VDOT BMP Design Manual of Practice 3 of 50 Chapter 2 – Dry Extended Detention Basin . illustrates recommended outlet configurations for the control of sediment, trash, and
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