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Whitewater River Region Stormwater Quality Best Management Practice Design Handbook for Low Impact Development

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Whitewater River Region Stormwater Quality Best Management Practice Design Handbook for Low Impact Development Riverside County Whitewater River Region Stormwater Quality Best Management Practice Design Handbook for Low Impact Development Riverside County Flood Control and Water Conservation District 1995 Market Street Riverside CA 92501 June 2014 Riverside County Stormwater Quality Best Management Practice Whitewater River Region Design Handbook for Low impact Development This page intentionally left blank to facilitate double‐sided printing June 2014 i Riverside County Stormwater Quality Best Management Practice Whitewater River Region Design Handbook for Low Impact Development Table of Contents 1.0 Introduction ............................................................................................................................................ 1 1.1 Limitations ............................................................................................................................................... 2 2.0 Tributary Drainage Area .......................................................................................................................... 3 2.1 Self‐Retaining Areas ................................................................................................................................ 3 2.2 Self‐Treating Areas .................................................................................................................................. 4 3.0 BMP Selection ......................................................................................................................................... 6 3.1 Identifying Project Pollutants of Concern ............................................................................................... 6 3.2 Identifying Receiving Water Impairments .............................................................................................. 7 3.3 Addressing Potential Project Pollutants of Concern ............................................................................... 7 3.4 BMP Pollutant Removal Effectiveness .................................................................................................... 7 3.5 Final BMP Selection ................................................................................................................................. 8 3.6 Basis for BMP Design ............................................................................................................................ 11 4.0 BMP Sizing ............................................................................................................................................. 12 4.1 Impervious Ratio ................................................................................................................................... 12 4.2 Drawdown Times .................................................................................................................................. 13 4.2.1 Maximum Depth ................................................................................................................................ 13 4.3 VBMP Calculation for Volume Based Design ........................................................................................... 13 4.4 QBMP Calculation for Flow Based Design ............................................................................................... 14 5.0 BMP Fact Sheets and Design Worksheets ............................................................................................ 18 6.0 Resources .............................................................................................................................................. 20 6.1 Local Land Use Authority Onsite Retention Requirements .................................................................. 20 6.2 Local Land Use Authority Standards and Ordinances ........................................................................... 21 6.3 Local Land Use Authority Resource Links ............................................................................................. 22 7.0 References ............................................................................................................................................ 24 Appendix A – BMP Factsheets .................................................................................................................... 26 A.1 Landscaped Swales ............................................................................................................................... 28 A.2 Landscaped Filter Strips ........................................................................................................................ 34 A.3 Bioretention Facilities ........................................................................................................................... 40 A.4 Extended Detention Basin BMP Factsheet ........................................................................................... 52 June 2014 i Riverside County Stormwater Quality Best Management Practice Whitewater River Region Design Handbook for Low Impact Development A.5 Sand Filter Basin ................................................................................................................................... 77 A.6 Permeable Pavement ........................................................................................................................... 85 A.7 Infiltration Basin ................................................................................................................................... 95 A.8 Infiltration Trench ............................................................................................................................... 103 Appendix B – Infiltration Testing Guidelines ............................................................................................ 111 Appendix C – Underdrain Guidelines ........................................................................................................ 145 June 2014 ii Riverside County Stormwater Quality Best Management Practice Whitewater River Region Design Handbook for Low Impact Development This page intentionally left blank to facilitate double‐sided printing June 2014 iii Riverside County Stormwater Quality Best Management Practice Whitewater River Region Design Handbook for Low Impact Development 1.0 Introduction The purpose of this Riverside County Whitewater River Region Stormwater Quality Best Management Practice Design Handbook for Low Impact Development (Handbook) is to provide selection and design guidance for stormwater Best Management Practices (BMPs) for Priority Development Projects (PDPs) within the Whitewater River Region of Riverside County while meeting the goals of Low Impact Development (LID), where feasible. LID in the Whitewater River Region seeks to control runoff and pollutants close to their source, but has a slightly different approach than in areas with more annual rainfall. The Whitewater River Region Water Quality Management Plan Guidance Document (June 2014, and revised January 2015) (WWR WQMP) defines LID/site design BMPs as: Activities or programs to educate the public or provide low cost non‐physical solutions, as well as facility design or practices aimed at reducing urban runoff, increasing infiltration, reducing pollutant transport mechanisms, and minimizing the difference between pre‐ and post‐development urban runoff. More simply, LID/Site Design BMPs promote retention and/or feature a natural treatment mechanism to address a site’s Potential Pollutants of Concern. The overall majority of PDPs within the Whitewater River Region have historically been, and continue to be subject to local onsite retention requirements (see Section 6.1, Table 4 ‐ Local Land Use Authority Onsite Retention Requirements). In the past, these local requirements were implemented to address downstream impacts; more recently, these requirements have been noted for their ability to meet the goals of LID. Important Note: If your project is located in an area subject to a local onsite retention requirement, then the retention facility utilized to address your project’s runoff will be sized and designed to meet the requirements of the local land use authority, and per Section 3.5.1.2 of the WWR WQMP, additional LID/site design and/or treatment control BMPs will not be required, the LID/site design measurable goal described in Section 3.5.1.1 of the WWR WQMP will have been met, and this Handbook will not be applicable to your project. Details for sizing and design of retention facilities to comply with local ordinance can be obtained from the applicable local land use authority. If your project is not subject to local land use authority onsite retention requirement, then you must select LID/site design BMPs and/or treatment control BMPs to address Potential Project Pollutants of Concern (PPPC), and Hydrologic Conditions of Concern (HCOC) if necessary. This Handbook provides guidance for: Selecting LID/site design BMPs to effectively address the PPPC generated by the project, while meeting the LID/site design measurable goal described in Section 3.5.1.1 of the WWR WQMP; Selection of site layout features to decrease the amount of impervious surface; and Sizing of selected LID/site design BMPs to treat the required water quality design volume (VBMP) or water quality design flow rate (QBMP). June 2014 1 Riverside County Stormwater Quality Best Management Practice Whitewater River Region Design Handbook for Low Impact Development 1.1 Limitations Use of this Handbook is contingent upon acceptance of the limitations
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