Volume 2-05, Chapter 3 - City of Wichita

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Section 3.2 - Primary TSS Treatment Facilities 3.2 Primary TSS Treatment Facilities This section contains design guidelines for the following TSS treatment facilities: • Stormwater pond • Extended dry detention pond • Vegetative filter strip • Grassed channel • Enhanced swale • Infiltration trench • Soakage trench • Surface sand filter • Bioretention areas • Stormwater wetland Page 3 - 24 Volume 2, Technical Guidance
Section 3.2.1 - Stormwater Pond 3.2.1 Stormwater Pond Primary Water Quality Facility Description: Constructed stormwater retention basin that has a permanent water quality pool (or micropool). Runoff from each water quality rain event displaces all or part of the permanent pool, and is treated in the pool primarily through settling and biological uptake mechanisms. KEY CONSIDERATIONS DESIGN CRITERIA: • Minimum contributing drainage area of 25 acres; 10 acres for extended detention micropool pond • A sediment forebay or equivalent upstream pretreatment must be provided • Minimum length to width ratio for the pond is 1.5:1 • Pond slopes shall adhere to those found in Figure 3-12 ADVANTAGES / BENEFITS: • Moderate to high removal rate of urban pollutants • High community acceptance • Opportunity for wildlife habitat DISADVANTAGES / LIMITATIONS: • Potential for thermal impacts/downstream warming • Dam height restrictions for high relief areas • Pond drainage can be problematic for low relief terrain MAINTENANCE REQUIREMENTS: • Remove debris from inlet and outlet structures • Maintain side slopes / remove invasive vegetation • Monitor sediment accumulation and remove periodically • Dam inspection and maintenance H M M POLLUTANT REMOVAL Total Suspended Solids Nutrients – Total Phosphorus & Total Nitrogen Metals – Cadmium, Copper, Lead & Zinc STORMWATER MANAGEMENT SUITABILITY Water Quality Protection Channel Protection On-Site Flood Control Downstream Flood Control M L L IMPLEMENTATION CONSIDERATIONS Land Requirements Capital Costs Maintenance Burden Residential Subdivision Use: Yes High Density/Ultra-Urban: No Drainage Area: 10-25 acres min Soils: Hydrologic group ‘A’ and ‘B’ soils may require pond liners Other Considerations: • Outlet Clogging • Safety Bench • Landscaping L=Low M=Moderate H=High H Pathogens – Coliform, Streptococci & E. Coli Volume 2, Technical Guidance Page 3 - 25
Page 1 and 2: CHAPTER 3 STORMWATER CONTROLS TABLE
Page 3 and 4: Chapter 3 - Table of Contents 3.2.8
Page 5 and 6: Chapter 3 - Table of Contents LIST
Page 7 and 8: Section 3.1 - Stormwater Management
Page 29: Section 3.1 - Stormwater Management
Page 33 and 34: Section 3.2.1 - Stormwater Pond Fig
Page 35 and 36: Section 3.2.1 - Stormwater Pond For
Page 37 and 38: Section 3.2.1 - Stormwater Pond •
Page 39 and 40: Section 3.2.1 - Stormwater Pond 1'
Page 45 and 46: Section 3.2.1 - Stormwater Pond 3.2
Page 47 and 48: Section 3.2.1 - Stormwater Pond Ste
Page 53 and 54: Section 3.2.2 - Extended Dry Detent
Page 59 and 60: Section 3.2.3 - Vegetative Filter S
Page 67 and 68: Section 3.2.4 - Grassed Channel 3.2
Page 73 and 74: Section 3.2.4 - Grassed Channel max
Page 75 and 76: Section 3.2.5 - Enhanced Swale 3.2.
Page 77 and 78: Section 3.2.5 - Enhanced Swale Chan
Page 79 and 80: Section 3.2.5 - Enhanced Swale B. G
Page 81 and 82:
Section 3.2.5 - Enhanced Swale High
Page 83 and 84:
Section 3.2.5 - Enhanced Swale Side
Page 85 and 86:
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 3.2.10 - Stormwater Wetland
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Section 3.3 - Secondary TSS Treatme
Page 153 and 154:
Section 3.3.1 - Proprietary Treatme
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Section 3.3.1 - Proprietary Treatme
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Section 3.3.2 - Gravity (Oil-Water)
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Section 3.3.3 - Alum Treatment 3.3.
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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 The
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Section 3.4.3 - Porous Pavement com
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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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