Volume 2-05, Chapter 3 - City of Wichita

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Section 3.3.4 - Underground Sand Filter treated by the underground sand filter shall be stabilized prior to construction and use of the sand filter. • Delaware underground sand filters are typically sited along the edge, or perimeter, of an impervious area such as a parking lot. • DC underground sand filters are installed within the storm drain system. • Underground sand filter systems shall be designed for intermittent flow and must be allowed to drain and re-aerate between rainfall events. They shall not be used on sites with a continuous flow from groundwater, sump pumps, or other sources. C. Physical Specifications / Geometry • The entire treatment system (including the sedimentation chamber) must temporarily hold at least 75% of the WQv prior to filtration. Figures 4-60 and 4-61 illustrate the distribution of the treatment volume (0.75 WQv) among the various components of the underground sand filters, including: • Vw – wet pool volume within the sedimentation basin • Vf – volume within the voids in the filter bed • Vtemp – temporary volume stored above the filter bed • As – the surface area of the sedimentation basin • Af – surface area of the filter media • hf – average height of water above the filter media (1/2 htemp) • df – depth of filter media • The sedimentation chamber shall be sized to at least 50% of the computed WQv. • The filter area shall be sized based on the principles of Darcy’s Law. A coefficient of permeability (k) of 3.5 ft/day for sand shall be used. The filter bed shall be designed to completely drain in 40 hours or less. • The filter media shall consist of an 18 inch to 24 inch layer of clean washed medium aggregate concrete sand (ASTM C-33) on top of the underdrain system. Figure 4-62 illustrates a typical media cross section. • The filter bed shall be equipped with a 6 inch perforated pipe underdrain (PVC AASHTO M 252, HDPE, or other suitable pipe material) in a gravel layer. The underdrain shall have a minimum grade of 1/8 inch per foot (1% slope). Holes shall be 3/8 inch diameter and spaced approximately 6 inches on center. Gravel shall be clean-washed aggregate with a maximum diameter of 3.5 inches and a minimum diameter of 1.5 inches with a void space of about 40%. Aggregate contaminated with soil shall not be used. Page 3 - 166 Volume 2, Technical Guidance
Section 3.3.4 - Underground Sand Filter Figure 3-47 Undergroundd (DC) Sand Filter Volumes (Source: Center for Watershed Protection) Volume 2, Technical Guidance Page 3 - 167
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CHAPTER 3 STORMWATER CONTROLS TABLE
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Chapter 3 - Table of Contents 3.2.8
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Chapter 3 - Table of Contents LIST
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Section 3.1 - Stormwater Management
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Section 3.2.1 - Stormwater Pond 3.2
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Section 3.2.1 - Stormwater Pond Fig
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Section 3.2.1 - Stormwater Pond For
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Section 3.2.1 - Stormwater Pond •
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Section 3.2.1 - Stormwater Pond 1'
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Section 3.2.1 - Stormwater Pond 3.2
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Section 3.2.1 - Stormwater Pond Ste
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Section 3.2.2 - Extended Dry Detent
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Section 3.2.3 - Vegetative Filter S
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Section 3.2.4 - Grassed Channel 3.2
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Section 3.2.4 - Grassed Channel max
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Section 3.2.5 - Enhanced Swale 3.2.
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Section 3.2.5 - Enhanced Swale Chan
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Section 3.2.5 - Enhanced Swale B. G
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Section 3.2.5 - Enhanced Swale High
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Section 3.2.5 - Enhanced Swale Side
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Section 3.2.5 - Enhanced Swale 3.2.
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Section 3.2.6 - Infiltration Trench
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Section 3.2.7 - Soakage Trench 3.2.
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Section 3.2.7 - Soakage Trench •
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Section 3.2.8 - Surface Sand Filter
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Section 3.2.9 - Bioretention Areas
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Section 3.2.9 - Bioretention Areas
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Page 133 and 134: Section 3.2.10 - Stormwater Wetland
Page 151 and 152: Section 3.3 - Secondary TSS Treatme
Page 153 and 154: Section 3.3.1 - Proprietary Treatme
Page 155 and 156: Section 3.3.1 - Proprietary Treatme
Page 157 and 158: Section 3.3.2 - Gravity (Oil-Water)
Page 163 and 164: Section 3.3.3 - Alum Treatment 3.3.
Page 165 and 166: Section 3.3.3 - Alum Treatment •
Page 167 and 168: Section 3.3.4 - Underground Sand Fi
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Page 181 and 182: Section 3.3.5 - Organic Filter 3.3.
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Page 185 and 186: Section 3.4 - Other Stormwater Mana
Page 187 and 188: Section 3.4.1 - Conventional Dry De
Page 193 and 194: Section 3.4.2 - Underground Dry Det
Page 199 and 200: Section 3.4.3 - Porous Pavement 3.4
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Page 205 and 206: Section 3.4.3 - Porous Pavement Fig
Page 207 and 208: Section 3.4.4 - Modular Porous Pave
Page 213 and 214: Section 3.4.5 - Green Roof 3.4.5 Gr
Page 215 and 216: Section 3.4.5 - Green Roof Signific
Page 217 and 218: Section 3.4.5 - Green Roof 3.4.5.3
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Volume 2-05, Chapter 3 - City of Wichita

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