Volume 2-05, Chapter 3 - City of Wichita

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Section 3.2.8 - Surface Sand Filter • Compute V f = water volume within filter bed/gravel/pipe = A f * d f * n Where: n = porosity = 0.4 for most applications • Compute V f-temp = temporary storage volume above the filter bed = 2 * h f * A f • Compute V s = volume within sediment chamber = V min - V f - V f-temp • Compute h s = height in sedimentation chamber = V s /A s • Ensure h s and h f fit available head and other dimensions still fit; change as necessary in design iterations until all site dimensions fit. • Size orifice from sediment chamber to filter chamber to release V s within 24- hours at average release rate with 0.5 h s as average head. Step 9 Step 10 Design inlets, pretreatment facilities, underdrain system, and outlet structures See Chapter 5 for more details. Compute overflow weir sizes • Size overflow weir at elevation h s in sedimentation chamber (above perforated stand pipe) to handle surcharge of flow through filter system from storms producing more than WQ v design event. • Plan inlet protection for overflow from sedimentation chamber and size overflow weir at elevation h f in filtration chamber (above perforated stand pipe) to handle surcharge of flow through filter system from storms producing more than WQ v design event. 3.2.8.7 Inspection and Maintenance Requirements Regular inspection and maintenance is critical to the effective operation of stormwater management facilities. An operation and maintenance plan is required and shall include: 1. “Covenants for Permanent Maintenance of Stormwater Management Facilities” (also called the “Maintenance Covenants”). An example covenants document can be found in Volume 3. 2. “Inspection Checklist and Maintenance Guidance” for each type of stormwater facility that is located on the property. Templates for each stormwater management facility can be found in Volume 3 of this manual. These templates can be amended slightly for use in more customized O&M plans. 3. As-built drawings must accurately identify the layout and location of the facility, and also clearly identify reserves and access easements. All stormwater management facilities must be maintained in accordance with the O&M Plan. Page 3 - 108 Volume 2, Technical Guidance
Section 3.2.8 - Surface Sand Filter 3.2.8.8 Example Schematics Figure 3-32 Schematic of Surface Sand Filter (adapted from Claytor & Schueler, 1996). Volume 2, Technical Guidance Page 3 - 109
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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 3.2.3 - Vegetative Filter S
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Page 75 and 76: Section 3.2.5 - Enhanced Swale 3.2.
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Page 87 and 88: Section 3.2.6 - Infiltration Trench
Page 99 and 100: Section 3.2.7 - Soakage Trench 3.2.
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Page 103 and 104: Section 3.2.8 - Surface Sand Filter
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Page 117 and 118: Section 3.2.9 - Bioretention Areas
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Section 3.3.3 - Alum Treatment •
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Section 3.3.4 - Underground Sand Fi
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Section 3.3.5 - Organic Filter 3.3.
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Section 3.3.5 - Organic Filter •
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Section 3.4 - Other Stormwater Mana
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Section 3.4.1 - Conventional Dry De
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Section 3.4.2 - Underground Dry Det
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Section 3.4.3 - Porous Pavement 3.4
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Section 3.4.3 - Porous Pavement Fig
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Section 3.4.4 - Modular Porous Pave
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Section 3.4.5 - Green Roof 3.4.5 Gr
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Section 3.4.5 - Green Roof Signific
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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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