Volume 2-05, Chapter 3 - City of Wichita

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Section 3.3.4 - Underground Sand Filter 3. Compute Vtemp = temporary storage volume = Vmin – (Vf + Vw) 4. Compute htemp = temporary storage height = Vtemp / (Af + As) 5. Ensure htemp ³ 2 * hf, otherwise decrease hf and re-compute. Ensure dimensions fit available head and area – change as necessary in design iterations until all site dimensions fit. 6. Size distribution slots from sediment chamber to filter chamber. Step 9 Step 10 Design inlets, underdrain system, and outlet structures. See Chapter 5 for more details. Compute overflow weir sizes. Underground (D.C.) sand filter: Vmin = 0.75 WQv = Vs + Vf + Vf-temp 1. Compute Vf = water volume within filter bed/gravel/pipe = Af * df * n where: n = porosity = 0.4 for most applications 2. Compute Vf-temp = temporary storage volume above the filter bed = 2 * hf * Af 3. Compute Vs = volume within sediment chamber = Vmin - Vf - Vf-temp 4. Compute hs = height in sedimentation chamber = Vs/As 5. Ensure hs and hf fit available head and other dimensions still fit – change as necessary in design iterations until all site dimensions fit. 6. Size orifice from sediment chamber to filter chamber to release Vs within 24- hours at average release rate with 0.5 hs as average head. 7. Design outlet structure with perforations allowing for a safety factor of times the orifice capacity. 8. Size distribution chamber to spread flow over filtration media – level spreader weir or orifices. Underground perimeter (Delaware) sand filter: Size overflow weir at end of sedimentation chamber to handle excess inflow, set at WQv elevation. Page 3 - 172 Volume 2, Technical Guidance
Section 3.3.4 - Underground Sand Filter 3.3.4.7 Example Schematics Figure 3-50 Schematic of an Undergroundd (D.C.) Sand Filter (Source: Center for Watershed Protection) Volume 2, Technical Guidance Page 3 - 173
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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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Page 127 and 128: Section 3.2.9 - Bioretention Areas
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.
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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 203 and 204: Section 3.4.3 - Porous Pavement com
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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