Challenging Sites Overview, Part 2
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Challenging Sites Overview, Part 2

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This PowerPoint describes each best practice, description of challenging sites, conveyances and flows, permitting, O&M

This PowerPoint describes each best practice, description of challenging sites, conveyances and flows, permitting, O&M

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Challenging Sites Overview, Part 2 Challenging Sites Overview, Part 2 Presentation Transcript

  • Stormwater Practices for Challenging Sites Sustainability for all the places between the buildings cell 503.334.8634 www.greengirlpdx.com greengirl@greengirlpdx.com a certified women business enterprise
  • What I’m About to Tell You How Residents Can Safely Manage Stormwater •Housekeeping •What’s a “Challenging Site”? •Why do our properties impact water quality? •Why is reducing runoff important? •What practices can we implement on our own properties?
  • About Me
  • About You
  • Challenging Sites are… … any area not suitable for infiltration of runoff. This includes: • Steep slopes/landslides • Clay soils • High seasonal groundwater • Inadequate setbacks (ex. Buildings too close together)
  • The Water Balance Model Water Quantity Before 25% baseflow (infiltration) 50% evaporation 0.5% runoff 100%average Annualrainfall 25%groundwater (infiltration)
  • Water Balance BEFORE Development Simplified
  • The Water Balance Model Water Quantity After 0” baseflow (infiltration) reducedevapo- transpiration 100%rainfall yearlyavg 98% runoff 2%evapo- transpiration Reduced infiltration
  • Water Balance AFTER Development Example: EVERYWHERE
  • “Before” & “After” Runoff Compared 0.5% runoff 98% runoff
  • Runoff: A Watershed Perspective in the West Hills • Flooding, landslides and stream bank erosion
  • The Water Balance Model Water Quality Before Some sediment
  • The Water Balance Model Water Quality After Sediment (air particulates) Nutrients Feces Other debris Sediment/turbidity Hydrocarbons Heavy metals (particles & soluble) Other chemicals Runoff volume Sediment/turbidity fertilizers pesticides herbicides Runoff volume 13
  • Restore the Soil: Lawn Areas Runoff prevented = 50%
  • Restore the Soil: Perennial Garden Areas Runoff prevented = 80%
  • Restore the Soil: Meadows Runoff prevented = 65%
  • Compost Amended Slopes Washington DOT • Great for keeping soil in place on steep slopes, too! http://www.wsdot.wa.gov/Design/Roadside/SoilBioengineering.htm
  • Lots of great information at soilsforsalmon.org
  • Contained Planters (Over Hardscapes)
  • Contained Planters (Over Impervious Area) Runoff prevented = 50%
  • Minimize Impervious Pavement Depaving Runoff prevented varies depending on what replaces the pavement, lawn or perennial garden.
  • Lots of great information at depave.org
  • Tree Planting
  • Porous Walkway & Patio Surface Types Homemade paversGrass-crete Flexible Pavements (GrassPave ) Commercial pavers Boardwalks/decksWood chips (pedestrian only) Gravel
  • Typical Permeable Paver Section
  • Porous Walkways Runoff prevented = 90%
  • Ecoroof/Green Roofs? • DIY Projects = areas where a single ply of impermeable lining can be used or where failure isn’t too problematic
  • Ecoroof/Green Roof Runoff prevented = 50%
  • Conveyances & Flows
  • Issues to look for • Drainage problems, like water pooling in your yard. • Bare spots
  • Issues to look for • Erosion: Stream banks
  • Issues to look for • Erosion: Garden areas
  • Historic Landslide Areas One way to identify them • Erosion: Landslides Bent trunks sometimes indicate areas where landslides occurred a long time ago = likely to happen again
  • Permitting
  • Operations & Maintenance
  • What I Just Told You How Residents Can Safely Manage Stormwater •Housekeeping •What’s a “Challenging Site”? •Why do our properties impact water quality? •Why is reducing runoff important? •What practices can we implement on our own properties?
  • Thank You!
  • Rain Barrels
  • Rain Barrels: Food for Thought
  • Rain Barrels: Landscape
  • Rainwater Harvesting: L andscapes A Watershed Perspective
  • Rainwater Harvesting: Indoor Uses