Slow It. Spread It. Sink It! an OKANAGAN HOMEOWNER’S GUIDE to USING RAIN AS a RESOURCE
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Slow it. Spread it. Sink it! AN OKANAGAN HOMEOWNER’S GUIDE TO USING RAIN AS A RESOURCE Practical and Eco-Friendly Ways to Protect Your Property and the Environment from the Effects of Rainwater Runoff Slow it. Spread it. Sink it! An Okanagan Homeowner’s Guide to Using Rain as a Resource Practical and Eco-Friendly Ways to Protect Your Property and the Environment from the Effects of Rainwater Runoff Second Edition February 2021 Prepared by: Okanagan Basin Water Board Adapted with permission from: Resource Conservation District of Santa Cruz County and Sonoma Resource Conservation District With Federal Funding Support through Natural Resources Canada’s Regional Adaptation Collaboratives Program Copies of this guide can be obtained from: www.obwb.ca www.okwaterwise.ca 1450 KLO Road, Kelowna, BC (250) 469-6271 STATEMENT OF PURPOSE This guide has been developed for educational purposes by the Okanagan Basin Water Board (OBWB) and its Okanagan WaterWise public outreach program. The rainfall capture and runoff control practices included in this guide are to be used as general guidelines and are not to be used as professional engineered specifications. Prior to implementation of ANY practices, seek technical assistance from a licensed professional engineer or landscape architect, and/or certified professionals in erosion and sediment control for specifications for these practices. Site-specific designs that address the needs and constraints of individual sites are essential. Who We Are The OBWB was instituted in 1970 through a collaboration between three Okanagan regional districts. The Board’s jurisdiction is defined by the borders of the Okanagan watershed, or basin. The basin is almost 200 km long and 8,000 km2 and stretches from the City of Armstrong in the north to the Town of Osoyoos in the south. It includes Okanagan, Kalamalka, Wood, Skaha, Vaseux and Osoyoos lakes, their tributaries, and the surrounding mountains. The overall objective of the OBWB is to undertake strategic projects and programs on a valley-wide scale that ensure a sustainable water supply for the citizens of the Okanagan while supporting member jurisdictions to meet their water management goals. Programs are supported through tax assessments on lands within the Okanagan watershed. The Board of Directors includes representatives from the three Okanagan regional districts, the Okanagan Nation Alliance, the Water Supply Association of BC and the Okanagan Water Stewardship Council – a multi-stakeholder group established by the Board to provide independent science-based advice on water issues. Acknowledgements A special thank you to the Resource Conservation District of Santa Cruz County and the Sonoma Resource Conservation Districts who generously granted permission for us to adapt their Slow It. Spread It. Sink it! guidebooks to address the unique conditions and water challenges of the Okanagan. Many individuals contributed to the development of this guide. Kellie Garcia, OBWB Policy and Planning Specialist, managed the project and IMPORTANT NOTE: National, conducted research, writing and editing. Elana Westers of Growing Inspired provided research and writing services for the 2nd edition. The guide provincial, and local regulations was also edited by Corinne Jackson, OBWB Communications Director. Guide design and layout was completed by Blue Heron Design Group (1st pertain to many of the subjects edition) and Karen Christensen (2nd edition). presented in this guide. Regulations change, as do the technical An Advisory Committee reviewed drafts and provided invaluable technical information and photos for the first edition of the guide (published in methods and standards for environmental protection. Be sure 2011). Much of the content was carried forward to the 2nd edition. Committee members included: to follow applicable regulations covering private land maintenance Gwen Steele Kim Stephens Rob Dickinson and related activities for your area. Don Dobson Eva Durance Trina Koch See the Resources Guide on pages Chris Johnston Jillian Tamblyn Anna Warwick Sears 53 and 54 for a list of contacts that you may need to consult when implementing rainfall capture and Gordon Hiebert, Judie Steeves, Judy Baumbrough, Bill Darnell, Buffy Baumbrough, Jennifer Miles, Bruce Fuller, Zoe Kirk and Gabe Cipes also runoff control practices. provided guide content and/or photos. Illustrations were completed by Ritch Waldron, Wildways Illustrated, and Page Gruys unless otherwise noted. i AN OKANAGAN HOMEOWNER’S GUIDE TO USING RAIN AS A RESOURCE TABLE OF CONTENTS INTRODUCTION ...............................................................................................................................................................................................................1 CHAPTER 1 - UNDERSTANDING THE RAINWATER HARVESTING POTENTIAL OF YOUR PROPERTY ..............................................................................3 Roofs ....................................................................................................................................................................................................................4 Elevated Structures .............................................................................................................................................................................................6 Walkways and Patios ..........................................................................................................................................................................................7 Driveways and Parking Areas .............................................................................................................................................................................8 Bare Soils and Landscapes ................................................................................................................................................................................9 CHAPTER 2 - EVALUATING RAINWATER RUNOFF ON YOUR PROPERTY ......................................................................................................................10 Do-It-Yourself Rainwater Runoff Evaluation .....................................................................................................................................................10 Difficult Sites and Site Constraints .................................................................................................................................................................. 13 Rainfall Capture and Mosquito Control ............................................................................................................................................................16 CHAPTER 3 - TECHNIQUES FOR RAINFALL CAPTURE AND RUNOFF CONTROL AROUND YOUR HOME ..................................................................... 18 Gutters and Downspouts ................................................................................................................................................................................ 20 Drip-Line Protection ........................................................................................................................................................................................ 22 Rainwater Collection Systems ........................................................................................................................................................................24 Outlet Protection ............................................................................................................................................................................................. 26 Rain Gardens ....................................................................................................................................................................................................27 Swales ............................................................................................................................................................................................................. 28 Infiltration Structures ........................................................................................................................................................................................31 Mulch Basins ................................................................................................................................................................................................... 33 Pervious Hardscapes ..................................................................................................................................................................................... 34 Ground Covers ................................................................................................................................................................................................ 36 Erosion Control Blankets ................................................................................................................................................................................ 38 Living Roofs ..................................................................................................................................................................................................... 39 Cross Drains ...................................................................................................................................................................................................