5/19/2011. Photos: David Dods, URS

Transcription

1 Rain Gardens Designing for the Midwest and Texas Agenda 1. Why LID? 2. Rain Garden Design for the Midwest David Dods URS Corp., Overland Park, KS , 3. Native vs. Engineered Soils; Designing for Hot & Dry Environments Photos: David Dods, URS 1

2 , URS from this to this? Photos: David Dods, URS 2

3 Little Raindrop on the Prairie Lots of Interception, Evaporation, & Infiltration; Little Runoff Photos: David Dods, URS Lots of Infiltration; Little Runoff Photo: Jim Hatchett Photo courtesy of Fred Rozumalski, Barr Engineering The Land-Water Connection Intimate Connection Between Land, Water, and Plants; Pollutant Removal, Groundwater Recharge Rooftop to River in Minutes Photos: David Dods Photos: David Dods, URS 3

4 How Fast Does Our Raindrop Move? Then Multiply All Over Town: Little infiltration. Lots of runoff moving very fast. Lawn, 1 hour Driveway, 1 minute Rooftop to gutter, 17 sec Photos: David Dods, URS The Land-Water Connection in the City Consequences: Water Pollution Photos: David Dods, URS, URS 4

5 When Stormwater Pollution is Visible Photo: Carla Dods 5

6 Flying Into Dallas Dallas Dallas 6

7 While Over in Fort Worth Dallas Photo: Texas Christian University Web Site Rain Gardens Designing for the Midwest and Dry Regions Photos: David Dods, URS 7

8 Shallow Bowl, Typ Rain Garden (Upper Midwest) Rain Garden Dan Shaw, Waterdrop Innovations Bioretention, ti Biofiltration ti Native Soil, Amended with Compost Deep Rooted Plants Infiltrate in hr. Reduces Runoff. Creates Habitat Barr Engineering Dan Shaw, Waterdrop Innovations Photo: Tom Sweet, URS Photos: David Dods, Rusty Schmidt, URS 8

9 Photo: Tom Sweet, URS Photo: Rusty Schmidt, URS Rain Gardens, Key Considerations: Size Soil Preparation Pre-Treatment t Erosion & Big Storms Plants Engineered Soils & Underdrains, URS 9

10 Soil Preparation Keep Equipment Out of Garden to Avoid Compaction Depth is Based on Infiltration Rate, to dry out in hr Photo: Kevin Slates, URS Photo provided by: Rusty Schmidt Photos: David Dods 10

11 Curb Cut and Sediment Forebay Grass Filter Strip Photo: Barr Engineering 11

12 On-Line vs. Off-Line Designs On-Line Off-Line Off-Line Reduces Erosion Problems, URS Photo: Kurt Leuthold, Barr Engineering 12

13 Photo: Jim Schuessler, BNIM Architects Results of a Successful Garden Infiltration Improves Each Year (clay soil) Lawn: 3 /Day Raingarden: 3 / Hour 13

14 Simple Materials, Low Cost Promotes Infiltration Plant Root Penetration into Deep Soils Survives Drought Requires Space Bioretention Soil Mix Pea Gravel No Filter Fabric Rototill Soil Interface Not Widely Used in Midwest Gravel Prevents Root Penetration Limits Infiltration Plants Survive Better with Deep Root Penetration Provides Positive Drainage Promotes Deep Root Penetration for Infiltration and Drought Survival Put Valve on Discharge Pipe to Control Drain Rates 14

15 Sand/Iron Filings Pre-Filter Adsorbs P 70% Sand, 30% Peat 70% Sand, 15% Peat, 15% Topsoil David s Home Soda Bottle Infiltrometer (patent pending) 15

16 Questions, Discussion? Photo Credits and Special Thanks for Guidance and Advice Rusty Schmidt, Waterdrop Innovations, Minneapolis, MN Dan Shaw, Waterdrop Innovations, River Falls, WI Kurt Leuthold and Fred Rozumalski, Barr Engineering, Minneapolis, MN Jim Schuessler, BNIM Architects, Kansas City, MO Lee Skabelund, Kansas State University, Manhatten, KS Available from Terrace Horticultural Books Carla Dods, Parkville, Missouri 16