Volume 2-05, Chapter 3 - City of Wichita

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Section 3.3.4 - Underground Sand Filter Figure 3-48 Perimeter Sand Filter Volumes (Source: Claytor and Schueler, 1996) Figure 3-49 Typical Sand Filter Media Cross Sections (Source: Claytor and Schueler, 1996) Page 3 - 168 Volume 2, Technical Guidance
Section 3.3.4 - Underground Sand Filter D. Outlet Structures • An outlet pipe shall be provided from the underdrain system to the facility discharge. Due to the slow rate of filtration, outlet protection is generally unnecessary (except for emergency overflows and spillways). However, the design shall ensure that the discharges from the underdrain system occur in a non-erosive manner. E. Emergency Spillway • An emergency bypass spillway or weir must be included in the underground sand filter design to safely pass flows that exceed the WQv (and CPv if the filter is utilized for channel protection purposes). F. Maintenance Access • The local jurisdiction may require that the facility be placed in a reserve and/or establishment of a drainage easement the facility, which is accessible from a public road or other accessible easement. When required, the drainage easement should be at least 20 feet wide, provide a minimum traversable width of 15 feet, have a maximum slope of no more than 10%, and be appropriately stabilized to withstand maintenance equipment and vehicles. Adequate access must be provided to the grates of the filter bed. Facility designs must enable maintenance personnel to easily remove and replace upper layers of the filter media. G. Safety Features • Inlets, access grates and outlets shall be designed and maintained so as not to permit access by children. Inlet and access grates to the underground sand filters may be locked. 3.3.4.6 Design Procedures Step 1 Step 2 Compute runoff control volumes Calculate the WQ v using equation 1-1. Determine if the development site and conditions are appropriate for the use of an underground sand filter. Consider the Application and Site Feasibility Criteria Check with local agencies as appropriate to determine if there are any additional restrictions and/or surface water or watershed requirements that may apply. Step 3 Compute the peak discharge for the WQ v , called Q wq , using equation 4-18. The peak rate of discharge for water quality design storm is needed for sizing of offline diversion structures. (a) Using WQ v , compute CN using equation 4-3. (b) Compute time of concentration (Chapter 4, Section 4). Volume 2, Technical Guidance Page 3 - 169
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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 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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