Volume 2-05, Chapter 3 - City of Wichita

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Section 3.2.9 - Bioretention Areas 3.2.9.1 General Description Bioretention areas (also referred to as bioretention filters or rain gardens) are structural stormwater controls that capture and temporarily store the WQ v using soils and vegetation in shallow basins or landscaped areas to remove pollutants from stormwater runoff. Bioretention areas are engineered facilities in which runoff is conveyed as sheet flow to the “treatment area” which consists of a grass buffer strip, ponding area, organic or mulch layer, planting soil, and vegetation. An optional sand or aggregate bed can also be included in the design to provide aeration and drainage of the planting soil. The filtered runoff is typically collected and returned to the conveyance system after detention, though it may infiltrate. Because bioretention areas remove pollutants using filtration, they are applicable primarly to impervious areas without high levels of fine particulates (clay/silt soils) in the runoff and should only be considered for sites where the sediment load is relatively low. There are numerous design applications, both on- and off-line, for bioretention areas. These include use on single-family residential lots (rain gardens), as off-line facilities adjacent to parking lots, along highway and road drainage swales, within larger landscaped pervious areas, and as landscaped islands in impervious or high-density environments. Figure 3-33 and Figure 3-34 illustrate examples of bioretention facilities. Residential Rain Garden Landscaped Island Newly Constructed Bioretention Area Newly Planted Bioretention Area Figure 3-33 Bioretention Area Examples Page 3 - 112 Volume 2, Technical Guidance
Section 3.2.9 - Bioretention Areas Figure 3-34 Bioretention area examples (Claytor & Schueler, 1996) 3.2.9.2 Stormwater Management Suitability Bioretentionn areas are designedd primarily for stormwater quality, i.e. the removal of stormwaterr pollutants. Bioretention can provide limited runoff quantity control, particularly for smaller storm events. These facilities may sometimes be used to partially or completely meet channel protection requirements on smaller sites. However, bioretention areas will typicallyy need to be used in conjunction with another structural control to provide channel protection as well as flood control. It is important to ensure that a bioretention areaa safely bypasses higher flows. Volume 2, Technical Guidance Page 3 - 113
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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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Page 75 and 76: Section 3.2.5 - Enhanced Swale 3.2.
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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 133 and 134: Section 3.2.10 - Stormwater Wetland
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Page 153 and 154: Section 3.3.1 - Proprietary Treatme
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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 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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