Page 5 - 7166 - Rain Garden Handbook

Table of Contents

PLAN BUILD
INTRODUCTION 09 27

How Rain Gardens Enhance Our Natural Environment Erica Guttman David Hymel
and Quality of Life......................................................................2
What is a Rain Garden?...............................................................3

Rain Gardens As Part of the Overall Approach
to Low Impact Development........................................................4
Rain Gardens Provide Multiple Benefits......................................5 1 PLAN
Four Stages to Create & Sustain a Rain Garden.........................6
How to Get Started....................................................................10
Recommended Timeline..............................................................8
Check Site Drainage..................................................................11
Where to Locate Your Rain Garden...........................................12
Where Not to Locate Your Rain Garden.....................................13
Test Your Soil............................................................................15
Determine the Size of Your Rain Garden...................................18
Rain Garden Sizing Chart..........................................................21
Rainfall Regions for Western Washington............................22-23
Determine the Shape of Your Rain Garden...............................26

2 BUILD

Prepare for Construction...........................................................28
Locate and Design the Inflow....................................................29
INTRO Always Provide an Overflow.......................................................29
01 Rain Garden Cross Section.......................................................30
Lay Out.....................................................................................31
David Hymel Excavate...................................................................................32

Create a Flat, Level Bottom......................................................40