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Low Impact Development (LID) Guidance Manual

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Low Impact Development (LID) Guidance Manual Low Impact Development (LID) Guidance Manual A Practical Guide to LID Implementation in Kitsap County Version 1.2 June 10, 2009 www.kitsapLID.org Published by Kitsap Home Builders Foundation Prepared by Funding for development of this Guide was provided in part through an EPA Clean Water Act, Section 319 Grant administered by the Washington State Department of Ecology. LID Guidance Manual – Kitsap County Low Impact Development in Kitsap County ii LID Guidance Manual – Kitsap County Low Impact Development in Kitsap County iv LID Guidance Manual – Kitsap County Table of Contents Acknowledgement/Credits ............................................................................................vii How to Use the Manual ................................................................................................ xi Chapter 1 - Low Impact Development in Kitsap County ................................................... 1 Chapter 2 - Site Assessment & Planning: Start Out Right ................................................ 8 Chapter 3 - Design Integration ........................................................................................ 18 Chapter 4 - Design & Flow Modeling Guidance .............................................................. 22 Chapter 5 - Beyond Design ............................................................................................. 31 Chapter 6 - Design Resources ........................................................................................ 38 Design Standard: Pervious Pavement – Hot Mix Asphalt ........................................... 41 Design Standard: Pervious Pavement - Concrete ....................................................... 57 Design Standard: Reinforced Grass & Gravel Systems .............................................. 73 Design Standard: Pervious Pavers .............................................................................. 87 Design Standard: Dispersion ....................................................................................... 99 Design Standard: Amendment of Disturbed Soils ..................................................... 107 Design Standard: Vegetated Roofs ........................................................................... 113 Design Standard: Rainwater Harvesting – Rain Barrels, Cisterns, & Potable Water 121 Design Standard: Bioretention ................................................................................... 129 Design Standard: Trees ............................................................................................. 143 Design Guidance Sheets ........................................................................................... 153 Design Guidance: Site Assessment .......................................................................... 155 Design Guidance: Clustering ..................................................................................... 160 Design Guidance: Circulation Layout ........................................................................ 164 Design Guidance: Street-Edge Treatments ............................................................... 171 Design Guidance: Right-of-Way Sections ................................................................. 178 Design Guidance: Dispersion .................................................................................... 186 Design Guidance: Bioretention Facilities ................................................................... 190 Design Guidance: Alternative Bioretention Strategies ............................................... 197 Design Guidance: Alley & Driveway Treatments ....................................................... 204 Design Guidance: Low-Impact Foundations .............................................................. 209 Design Guidance: Monitoring .................................................................................... 215 Bibliography .................................................................................................................. 219 Glossary and Definitions ............................................................................................... 221 Appendices ................................................................................................................... 226 Low Impact Development in Kitsap County v LID Guidance Manual – Kitsap County Low Impact Development in Kitsap County vi LID Guidance Manual – Kitsap County Acknowledgement/Credits This guidance document was developed by the Kitsap Home Builders Foundation (KHBF) to facilitate implementation of Low Impact Development (LID) Practices in the local jurisdictions of Kitsap County. Over a period of several months in 2006 and 2007, KHBF worked with a Leadership Team drawn from local planning and engineering departments, the design and development community, and other stakeholders to study and identify appropriate approaches to employing LID in Kitsap County. As the organization and emphasis of this document is based on the Leadership Team’s work, the KHBF would like to acknowledge the members of the Leadership Team, which includes: • Art Castle, Executive Vice President, Home Builders Association of Kitsap County; Secretary, Kitsap Home Builders Foundation, Grant Manager • Kathleen O’Brien, O’Brien & Company LLC, Grant Process Facilitator & Education • Keith Grellner, Assistant Director of Environmental Health, Kitsap County Health District • Alison O’Sullivan, Suquamish Tribe Biologist • Barry Berezowsky, City of Poulsbo Planning Director • Jeff Bauman, City of Poulsbo Public Works Director • Andrzej Kasiniak, City of Poulsbo City Engineer • Randy Kline, City of Poulsbo Associate Planner • Phil Williams, City of Bremerton Public Works Director • Michael Mecham, City of Bremerton City Engineer • Larry Matel, City of Bremerton Public Works Engineer • Dave Tucker, Assistant Director, Kitsap County Public Works • Dr. Chris May, University of Washington; Seattle Public Utilities • Bruce Wulkan, Puget Sound Partnership Stormwater Program Manager • John Cambalik, Puget Sound Partnership • Greg Byrne, City of Bainbridge Island Director of Planning and Community Development • Ross Hathaway, City of Bainbridge Island Assistant City Engineer • Jalyn Cummings, City of Bainbridge Island Water Resources Specialist • Bob Katai, City of Bainbridge Island Current Planning Manager • Maher Abed, City of Port Orchard Public Works Director • Joanne Long-Woods, City of Port Orchard Planning Director • Greg Rogers, Fire District #7; Kitsap County Fire Chiefs • Ed O’Brien, Department of Ecology Stormwater Engineer • Joan Nolan, Department of Ecology Water Quality Program • Alice Rubin, Department of Ecology Financial Manager, Water Quality Program • Emily Morris, Department of Ecology, Water Quality Program Low Impact Development in Kitsap County vii LID Guidance Manual – Kitsap County • Fred Salisbury, Port of Bremerton, Director of Airport and Industrial Operations • Phil Struck, Parametrix • Mark Kuhlman, Team 4 Engineering • Pat Fuhr, MAP Ltd. • Kathleen Byrne-Barrantes, Grant Solutions • Laura Edwards, Ron Melin and Daydra Denson served as LID Research Assistants while interning as Western Washington University students In addition, while the material has been customized to suit the needs of those using it, the text draws heavily on a few key sources, including: Low Impact Development – Technical Guidance Manual for Puget Sound Puget Sound Partnership & Washington State University Pierce County Extension, January 2005. Low Impact Development Design Strategies – An Integrated Design Approach EPA 841-B-00-003. Prepared by Prince George’s County Maryland, Department of Environmental Resources, Programs and Planning Division, January 2000. Stormwater Solutions Handbook Environmental Services, City of Portland, Oregon 2004 Portland Green Streets Program Portland Metro, Oregon 2002 Stormwater Flow Control and Water Quality Treatment Technical Requirements Manual City of Seattle 2009 (In Progress) Low Impact Development in Kitsap County viii LID Guidance Manual – Kitsap County The KHBF would like to thank the LID Standards Implementation Project Core Committee, including Kathleen O’Brien of O’Brien & Company, Dr. Chris May, Allison O’Sullivan for the Suquamish Tribe, and Art Castle of the Kitsap Home Builders Association. In addition, KHBF would like to acknowledge the project’s Executive Committee, which included: • Maher Abed, City of Port Orchard Public Works Director • Kim Abel, City of Port Orchard Mayor (through 12/07) • Jan Angel, Kitsap County Commissioner • Sherry Appleton, State Representative, 23rd District • Barry Berezowsky, City of Poulsbo Planning Director • Jim Bolger, Kitsap County Assistant Director of Department of Community Development • Cary Bozeman, City of Bremerton Mayor • John Cockburn, City of Bremerton Planning Commission • Lary Coppola, City of Port Orchard Mayor and Kitsap County Planning Commission • Scott Diener, Kitsap County Planning Manager of Department of Community Development • Rita DiIenno, City of Port Orchard City Council (through 12/07) • Christine Rolfes, State Representative, 23rd District • Chris Endresen, Kitsap County Commissioner (through 5/07) • Don Fisher, City of Bainbridge Island Planning Commission • Brad Gehring, City of Bremerton City Council • Michael Gustavson, Kitsap County Planning Commissioner • James Henry, City of Poulsbo Council (through 12/07) • Mary Ann Huntington, Port of Bremerton Commissioner (through 12/07) • Andre Kasiniak, City of Poulsbo
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