Volume 2-05, Chapter 3 - City of Wichita

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Section 3.1 - Stormwater Management Controls Overview Soils The key evaluation factors are based on an initial investigation of the NRCS hydrologic soils groups at the site. Note that more detailed geotechnical tests are usually required for infiltration feasibility and during design to confirm permeability and other factors. Special Considerations The design of structural stormwater controls is fundamentally influenced by the nature of the downstream water body that will be receiving the stormwater discharge. In addition, the designer should consult with the appropriate approval authority to determine if the development project is subject to additional or overriding stormwater structural control criteria as a result of an adopted local watershed plan or special provision. In some cases, higher pollutant removal or environmental performance is needed to fully protect aquatic resources and/or human health and safety within a particular watershed or receiving water. Therefore, special design criteria for a particular structural control or the exclusion of one or more controls may need to be considered within these watersheds or areas. Examples of important watershed factors to consider include: High Quality (or Potential High Quality) Streams (streams with a watershed impervious cover less than approximately 15%): These streams may also possess high quality cool water or warm water aquatic resources or endangered species. These streams may also be specially designated by local authorities. Wellhead and Aquifer Protection: Areas that recharge existing water supply wells and aquifers present a unique management challenge. The key design constraint is to prevent possible groundwater contamination by preventing infiltration of untreated hotspot runoff. At the same time, recharge of unpolluted stormwater is encouraged to help maintain flow in streams and wells during dry weather. Reservoir Protection: Watersheds that deliver surface runoff to water supply reservoirs or impoundments are a special concern. Depending on the treatment available, it may be necessary to achieve a greater level of pollutant removal for the pollutants of concern, such as bacteria pathogens, nutrients, sediment, or metals. One particular management concern for reservoirs is ensuring stormwater hotspots are adequately treated so they do not contaminate water supplies. Step 3 - Location and Permitting Considerations In the last step, a site designer assesses the physical and environmental features at the site to determine the optimal location for the selected structural control or group of controls. The checklist below (Table 3-3) provides a condensed summary of current restrictions as they relate to common site features that may be regulated under local, State, or federal laws and regulations. These restrictions fall into one of three general categories: • Locating a structural control within an area when expressly prohibited by law. Page 3 - 10 Volume 2, Technical Guidance
Section 3.1 - Stormwater Management Controls Overview • Locating a structural control within an area that is strongly discouraged, and is only allowed on a case by case basis. Local, State, and/or federal permits shall be obtained, and the applicant will need to supply additional documentation to justify locating the stormwater control within the regulated area. • Structural stormwater controls located in accordance with local setback requirements. This checklist is only intended as a general guide to location and permitting requirements as they relate to siting of stormwater structural controls. Consultation with the appropriate regulatory agency or authority is the best strategy. Table 3-3 Location and Permitting Checklist Site Feature Jurisdictional Wetland (Waters of the U.S) U.S. Army Corps of Engineers Regulatory Permit Stream Channel (Waters of the U.S) U.S. Army Corps of Engineers Section 404 Permit Location and Permitting Guidance Jurisdictional wetlands should be delineated prior to siting structural control. Use of natural wetlands for stormwater quality treatment is contrary to the goals of the Clean Water Act and should be avoided. Stormwater should be treated prior to discharge into a natural wetland. Structural controls may also be restricted in local buffer zones. Buffer zones may be utilized as a non-structural filter strip (i.e., accept sheet flow). Should justify that no practical upland preventive treatment alternatives exist. Where practical, excess stormwater flows should be conveyed away from jurisdictional wetlands. All Waters of the U.S. (streams, ponds, lakes, etc.) should be delineated prior to design. Use of any Waters of the U.S. for stormwater quality treatment is contrary to the goals of the Clean Water Act and should be avoided. Stormwater should be treated prior to discharge into Waters of the U.S. In-stream ponds for stormwater quality treatment are highly discouraged. Must justify that no practical upland preventive treatment alternatives exist. Temporary runoff storage preferred over permanent pools. Implement measures that reduce downstream warming. Stream and Floodplain Permits Kansas Department of Agriculture Kansas Department of Agriculture - Division of Water Resources permits for stream obstruction, channel change, flood plain fill, levee, water appropriations and buffers. Volume 2, Technical Guidance Page 3 - 11
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 15: Section 3.1 - Stormwater Management
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
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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 3.3.5 - 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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