Challenging Sites Overview, Part 2

  • 444 views
Uploaded on

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

More in: Education
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
444
On Slideshare
0
From Embeds
0
Number of Embeds
3

Actions

Shares
Downloads
0
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. 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
  • 2. 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?
  • 3. About Me
  • 4. About You
  • 5. 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)
  • 6. The Water Balance Model Water Quantity Before 25% baseflow (infiltration) 50% evaporation 0.5% runoff 100%average Annualrainfall 25%groundwater (infiltration)
  • 7. Water Balance BEFORE Development Simplified
  • 8. The Water Balance Model Water Quantity After 0” baseflow (infiltration) reducedevapo- transpiration 100%rainfall yearlyavg 98% runoff 2%evapo- transpiration Reduced infiltration
  • 9. Water Balance AFTER Development Example: EVERYWHERE
  • 10. “Before” & “After” Runoff Compared 0.5% runoff 98% runoff
  • 11. Runoff: A Watershed Perspective in the West Hills • Flooding, landslides and stream bank erosion
  • 12. The Water Balance Model Water Quality Before Some sediment
  • 13. 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
  • 14. Restore the Soil: Lawn Areas Runoff prevented = 50%
  • 15. Restore the Soil: Perennial Garden Areas Runoff prevented = 80%
  • 16. Restore the Soil: Meadows Runoff prevented = 65%
  • 17. Compost Amended Slopes Washington DOT • Great for keeping soil in place on steep slopes, too! http://www.wsdot.wa.gov/Design/Roadside/SoilBioengineering.htm
  • 18. Lots of great information at soilsforsalmon.org
  • 19. Contained Planters (Over Hardscapes)
  • 20. Contained Planters (Over Impervious Area) Runoff prevented = 50%
  • 21. Minimize Impervious Pavement Depaving Runoff prevented varies depending on what replaces the pavement, lawn or perennial garden.
  • 22. Lots of great information at depave.org
  • 23. Tree Planting
  • 24. Porous Walkway & Patio Surface Types Homemade paversGrass-crete Flexible Pavements (GrassPave ) Commercial pavers Boardwalks/decksWood chips (pedestrian only) Gravel
  • 25. Typical Permeable Paver Section
  • 26. Porous Walkways Runoff prevented = 90%
  • 27. Ecoroof/Green Roofs? • DIY Projects = areas where a single ply of impermeable lining can be used or where failure isn’t too problematic
  • 28. Ecoroof/Green Roof Runoff prevented = 50%
  • 29. Conveyances & Flows
  • 30. Issues to look for • Drainage problems, like water pooling in your yard. • Bare spots
  • 31. Issues to look for • Erosion: Stream banks
  • 32. Issues to look for • Erosion: Garden areas
  • 33. 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
  • 34. Permitting
  • 35. Operations & Maintenance
  • 36. 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?
  • 37. Thank You!
  • 38. Rain Barrels
  • 39. Rain Barrels: Food for Thought
  • 40. Rain Barrels: Landscape
  • 41. Rainwater Harvesting: L andscapes A Watershed Perspective
  • 42. Rainwater Harvesting: Indoor Uses