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Chapter 12 –Stormwater Sand Filters

VDOT BMP Design Manual of Practice i Chapter 12 stormwater sand Filters Chapter 12 stormwater sand Filters TABLE OF CONTENTS Overview of Practice .. 1 Site Constraints and Siting of the filter .. 5 Minimum Drainage Area .. 5 Maximum Drainage Area .. 5 Elevation of Site Infrastructure .. 5 Depth to Water Table and/or Bedrock .. 5 Existing Utilities .. 6 Wetlands .. 6 Upstream Sediment Loading .. 6 Aesthetic Considerations .. 6 Control of Surface Debris .. 6 Hydrocarbon Loading .. 7 Perennial and Chlorinated Flows .. 7 Surface Loading .. 7 General Design Guidelines .. 8 Isolation of the Water Quality Volume (WQV) .. 8 sand filter Media .. 9 Discharge Flows .. 9 filter Sizing .. 9 Design Process .. 10 Step 1. Compute the Required Water Quality Volume .. 10 Step 2A. Size filter and Pre-Treatment Sedimentation Chamber Washington Underground Vault sand filter .

12.1 - Overview ofPractice. VDOT BMP Design Manual of Practice 1 of 21 Chapter 12 –Stormwater Sand Filters . 12.1 Overview of Practice . Stormwater sand filters are practices employed when the runoff from a site is expected

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