Volume 2-05, Chapter 3 - City of Wichita

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Section 3.1 - Stormwater Management Controls Overview detention ponds, stormwater wetlands, porous surface systems, and, to some extent, other runoff-detaining or infiltrating facilities. 3.1.2.3 Flood Control On-Site: Selected stormwater management controls (grassed swales, detention ponds, stormwater ponds, and stormwater wetlands) may be used in conjunction with other drainage controls (storm sewers, channels, curbs and gutters, etc.) to safely convey stormwater through a development in accordance with the stormwater drainage design criteria. Downstream: Selected stormwater management controls (grassed swales, infiltration systems, detention ponds, stormwater ponds, and stormwater wetlands) may be used to retain, detain and otherwise regulate the volume and rates of stormwater discharge from flood events, as determined by the downstream assessment, in accordance with flood control criteria. 3.1.3 Selecting Stormwater Management Controls 3.1.3.1 Screening Process Outlined below is a screening process intended to assist the site designer and design engineer in the selection of the most appropriate structural controls for a development site, and to provide guidance on factors to consider in their physical location. In general, the following four criteria should be evaluated in order to select the appropriate structural control(s) or group of controls for a development, as summarized in Appendix E, Table E-1: • Stormwater Management Suitability; • Relative Water Quality Treatment Performance; • Site Applicability; and, • Implementation Considerations. In addition, for a given site, the following factors should be considered and any specific design criteria or restrictions need to be evaluated, as summarized in Appendix E, Table E-2: • Physiographic Factors; • Soils; and, • Special Considerations. Finally, environmental and other local, State and federal regulations must be considered as they may influence the location of a structural control on the site, or may require a permit. Page 3 - 6 Volume 2, Technical Guidance
Section 3.1 - Stormwater Management Controls Overview The following describes a selection process for comparing and evaluating various structural stormwater controls using a screening matrix and a list of location and permitting factors. These tools are provided to assist the design engineer in selecting the subset of structural controls that will meet the stormwater management and design objectives for a development site or project. Step 1 - Overall Applicability Through the use of the four screening categories in the matrix shown in Appendix E, Table E- 1, the site designer evaluates and screens the overall applicability of the full set of structural controls as well as the constraints of the site in question. The following are the details of the various screening categories and individual characteristics used to evaluate the structural controls. Stormwater Management Suitability The first category in the matrix examines the capability of each structural control option to provide all or part of water quality treatment, downstream channel protection, and flood control requirements. A blank entry means that the structural control cannot or is not typically used to meet the indicated requirement. Ability to treat the WQ v : This indicates whether a structural control can be used to treat all or part of the WQ v . The presence of a “P” or an “S” indicates whether the control is a Primary or Secondary control (see Section 3.1.1.2) for meeting the TSS reduction goal. Ability to provide the CP v : This indicates whether the structural control can be used to provide all or part of the extended detention required for the CP v . The presence of a “P” indicates that the structural control is commonly used. An “S” indicates that the structural control may be used, but the volume provided is usually limited. Ability to provide Flood Control: This indicates whether a structural control can be used to meet the flood control criteria. The presence of a “P” indicates that the structural control is typically used to provide peak flow reduction of the flood events, including the 100-year storm event. An “S” indicates that the control can be used to reduce the volume and rate of onsite runoff, but is usually not sufficient to provide the majority of flood control. Relative Water Quality Treatment Performance The second category of the matrix provides an overview of the pollutant removal performance of each structural control option, when designed, constructed, and maintained according to the criteria and specifications in this Manual. Ability to provide TSS and Sediment Removal: This column indicates the capability of a structural control to remove sediment in runoff. The Primary (“P”) structural controls remove 30% to 90% of the average annual TSS load in typical urban post-development runoff (and a proportional removal of other pollutants). Volume 2, Technical Guidance Page 3 - 7
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
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Page 31 and 32: Section 3.2.1 - Stormwater Pond 3.2
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 61 and 62: Section 3.2.3 - Vegetative Filter S
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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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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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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 3.4 - 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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