David Dods Blue Thumb Guide to Rain Gardens - Brochure


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David Dods Blue Thumb Guide to Rain Gardens - Brochure

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David Dods Blue Thumb Guide to Rain Gardens - Brochure

  1. 1. 3/26/2011 David Dods URS Corp., Overland Park, KSPhotos: David Dods Year 5 1
  2. 2. 3/26/2011 Lessons: With some care and help from us, Mother Nature has an amazing ability to restore degraded lands and waters. It All Begins with Regional Planning and Site Design Rain Gardens • Shallow gardens with plants that tolerate Planting Beds - periodic saturation Two Approaches • Dry out in a day or two • Restore hydrologic function to the landscape • Habitat • Attractive Landscaping Native Soil Rain Garden Engineered Soil + Underdrain Bioretention Illustrations: Dan Shaw, Waterdrop Innovations; Barr EngineeringPhoto: Barr Engineering; Illustration: Dan Shaw 2
  3. 3. 3/26/2011 Rain Garden Examples: Common Applications Downspout Driveway Photos: David Dods, URS Corp. Park & Landscape Features (Filtering runoff to protect park lake)Photo: Rusty Schmidt, Waterdrop Innovations Design by BNIM Architects 3
  4. 4. 3/26/2011 Parking Lot Edge Parking Lot Island Photo: David Dods, URS Photo: David Dods Driveway Runoff Street Edges Photo: Rusty Schmidt, Waterdrop InnovationsPhoto: David Dods 4
  5. 5. 3/26/2011 Design & Photo by BNIM ArchitectsRain Garden Design Define Project Goals 1. Define Project Goals 2. Site Analysis What is the purpose of the rain garden? 3. Sizing 4. Garden Bed Remove specific pollutantsWater Soil Provide detention & volume control Preparation 5. Inlets & Outlets l l Groundwater recharge G d t h 6. Mulch, Edging, & Finishing Touches Design depends upon the goals 7. Care & Maintenance Plants 8. Plants 5
  6. 6. 3/26/2011 Locations • Catch Runoff Near the • Where does the Source water come from? • Avoid “End of Pipe” or • Where does it Bottom of the Hill flow? • Evenly Spread Across the Site • Small Drainage Areas ~ 1 acre or less • Above-Ground Obstructions: Trees, Power Catch Water Before it Lines, Structures, Walking Paths, etc. Picks Up Lots of Speed • Below-Grade Utilities: Call in a Utility CheckPhotos: Barr Engineering (L), Portland Stormwater Manual (R) Soil Types & Compaction Utilities Depth to Groundwater and Bedrock Uphill of Buildings on Slopes Behind Structural Retaining Walls if Not Designed for Water Note asphalt layers Photo: David Dods Photo: Barr Engineering 6
  7. 7. 3/26/2011 Percolation Test • Time how fast the water goes down • How many inches soak away in 24-36 hrs Runoff Volume = Precip x Drainage Area x Runoff Coeff. Photo: Barr EngineeringIllustration: Marjorie Vigoren, City of Plymouth, MN Land Use & Runoff Coefficients (Small Storm Hydrology Method) Runoff Coefficients Vary by Land Use and Storm Event Size Building, Turf Length x Width w/ Flat Parking Lot Roof Depth D th Volume Rv = 0.87 0.23 0.98 (for 1.4 in. storm event) 7
  8. 8. 3/26/2011 When to Use Engineered Soils (Bioretention) (Bioretention) Garden Excavation If not enough area is available for a rain garden, bioretention Keep Equipment Out of can use less space Garden to Engineered soils drain faster, so the garden can be deeper Avoid Compaction and not as wide Meet specific pollutant filtration goal Max Depth ~ 18” (typ) Photos: 1) Kevin Slates, URS, 2) Barr Engineering Bed Shape: Garden Bed Preparation Flat- Flat-Bottomed Bowl Using Native Soils • Dig out basic bed shape • Rip & Break up compacted soils • Till in 3 – 4” inches compost • Rake out to final shapeIllustrations: Dan Shaw, Waterdrop InnovationsSource: The Blue Thumb Guide to Raingardens, by Schmidt, Shaw, & Dods Photograph: Carla Dods 8
  9. 9. 3/26/2011 Re- Re-test Infiltration Before PlantingPhoto provided by: Rusty Schmidt Photograph: Carla Dods Mulch Planting Use Coarse, Double- Shredded Hardwood Pinebark Nuggets & Cedar Chips Float Photographs: Carla Dods and David Dods Photos: David Dods 9
  10. 10. 3/26/2011 “Off- “Off-Line” Design “On- “On-Line” vs. “Off-Line” Designs “Off- On-Line Off-Line Garden Full Off-Line Reduces Erosion Problems System Photographs courtesy of Barr Engineering Overflow Curb Cut, Grass Filter Strip, & Splash Pad Depress Sod below curbPhoto: David Dods, URS Photo: Barr Engineering 10
  11. 11. 3/26/2011 Curb Cut and Sediment Forebay Temporary Bypass During Plant Establishment Sandbags to Divert Flow Photo: Barr Engineering Photo: Barr Engineering Outlets: Make sure overflows from large storms have a controlled discharge point Finishing Touches Borders and Edging: Make the Garden Look Deliberate Photographs: Carla Dods; Rusty Schmidt Manhole with a riserPhoto: Rusty Schmidt 11
  12. 12. 3/26/2011 Maintenance: Results of a Successful Garden: Typical Landscaping Requirements Infiltration Improves Each Year (silty clay soils) (silty Weed: 4-5x 1st yr, 3x 2nd yr, then 2x/yr Prune & Mulch: Annually Clean sand & debris at inlet: 2x/yr Lawn: 3 3” / Day Raingarden: 3” / HourPhoto: Barr Engineering Photo: David Dods Reference: The Blue Thumb Guide to Raingardens Written for upper Midwest, but principles and many of the plants are appropriate for Texas too Rusty Schmidt, Washington Conservation District, Stillwater, MN Dan Shaw, Waterdrop Innovations Kurt Leuthold and Fred Rozumalski, Barr Engineering, Minneapolis, MN Mi li Marjorie Vigoren, City of Plymouth, MN Jim Schuessler, BNIM Architects, Kansas City, MO Carla Dods Available from Terrace Horticultural Books www.terracehorticulturalbooks.com 12
  13. 13. 3/26/2011 Questions ?david_dods@urscorp.com, 913.344.1022 13