Volume 2-05, Chapter 3 - City of Wichita

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Section 3.2.6 - Infiltration Trench 3 FT REMOVABLE WELL CAP 1 FT GEOTEXTILE FILTER FABRIC UNDISTURBED SOIL 4 FT DEEP TRENCH FILLED WITH 1-3 INCH CLEAN STONE MINIMUM INFILTRATION RATE OF 0.50 INCH PER HOUR 1/2 INCH DIAMETER X 12 INCH LONG REBAR ANCHOR 6 INCH DIAMETER PERFORATED PVC PIPE 12 INCH SQUARE PRE-CAST CONCRETE PAVING STONE FOOT PLATE Figure 3-26 Observation Well Detail • The aggregate material for the trench should consist of a clean aggregate with a maximum diameter of 3 inches and a minimum diameter of 1.5 inches. • The aggregate should be graded such that there will be few aggregates smaller than the selected size. For design purposes, void space for these aggregates may be assumed to be 40%. • A 6-inch layer of clean, washed sand is placed on the bottom of the trench to encourage drainage and prevent compaction of the native soil, while the stone aggregate is added. • The aggregate should be completely surrounded with an engineering filter fabric. If the trench has an aggregate surface, filter fabric should surround all of the aggregate fill material except for the top 1 foot. • The observation well should consist of perforated PVC pipe, 4 to 6 inches diameter, located in the center of the trench, and be constructed flush with the ground elevation of the trench. • The screw top lid should be cast iron and clearly labelled as an observation well. Page 3 - 92 Volume 2, Technical Guidance
Section 3.2.7 - Soakage Trench 3.2.7 Soakage Trench Primary Water Quality Facility Description: Soakage trenches are a variation of infiltration trenches. Soakage trenches drain through a perforated pipe buried in gravel. They are used in highly impervious areas where conditions do not allow surface infiltration and where pollutant concentrations in runoff are minimal (i.e. non-industrial rooftops). They may also be used in conjunction with local unregulated stormwater devices, such as residential roof downspouts. KEY CONSIDERATIONS DESIGN CRITERIA: • Intended for space-limited applications • Like other infiltration devices, soakage trenches should not be used for stormwater containing high sediment loads to minimize clogging ADVANTAGES / BENEFITS: • Filtration provides pollutant removal capability • Reservoir decreases peak flow rates DISADVANTAGES / LIMITATIONS: • Subsurface pipe considered an injection well and may require special permit MAINTENANCE REQUIREMENTS: • Remove sediment and oil/grease from pre-treatment devices, as well as overflow structures • Mow grass filter strips as necessary H M H 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 IMPLEMENTATION CONSIDERATIONS M H H Land Requirements Relative Capital Costs Maintenance Burden Residential Subdivision Use: Yes High Density/Ultra-Urban: Yes Drainage Area: 5 acres max. Soils: Pervious soils required (0.5 in/hr or greater) L=Low M=Moderate H=High H Pathogens – Coliform, Streptococci & E. Coli Volume 2, Technical Guidance Page 3 - 93
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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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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.
Page 87 and 88: Section 3.2.6 - Infiltration Trench
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Page 101 and 102: Section 3.2.7 - Soakage Trench •
Page 103 and 104: Section 3.2.8 - Surface Sand Filter
Page 117 and 118: Section 3.2.9 - Bioretention Areas
Page 133 and 134: Section 3.2.10 - Stormwater Wetland
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Section 3.2.10 - Stormwater Wetland
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Section 3.3 - Secondary TSS Treatme
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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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