Stormwater Practices
for Challenging Sites
Sustainability for all the places between the buildings
cell 503.334.8634
www.g...
What I’m About to Tell You
How Residents Can Safely Manage Stormwater
•Housekeeping
•What’s a “Challenging Site”?
•Why do ...
About Me
About You
Challenging Sites are…
… any area not suitable for infiltration of runoff.
This includes:
• Steep slopes/landslides
• Clay...
The Water Balance Model
Water Quantity Before
25% baseflow
(infiltration)
50%
evaporation
0.5% runoff
100%average
Annualra...
Water Balance BEFORE Development
Simplified
The Water Balance Model
Water Quantity After
0” baseflow
(infiltration)
reducedevapo-
transpiration
100%rainfall
yearlyavg...
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
Hy...
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/Desi...
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 g...
Lots of great information at
depave.org
Tree Planting
Porous Walkway & Patio Surface Types
Homemade paversGrass-crete
Flexible Pavements
(GrassPave )
Commercial pavers
Boardwal...
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 to...
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 landsli...
Permitting
Operations & Maintenance
What I Just Told You
How Residents Can Safely Manage Stormwater
•Housekeeping
•What’s a “Challenging Site”?
•Why do our pr...
Thank You!
Rain Barrels
Rain Barrels: Food for Thought
Rain Barrels: Landscape
Rainwater Harvesting: L andscapes
A Watershed Perspective
Rainwater Harvesting: Indoor Uses
Upcoming SlideShare
Loading in...5
×

Challenging Sites Overview, Part 2

588

Published on

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

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
588
On Slideshare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
1
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Challenging Sites Overview, Part 2

  1. 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. 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. 3. About Me
  4. 4. About You
  5. 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. 6. The Water Balance Model Water Quantity Before 25% baseflow (infiltration) 50% evaporation 0.5% runoff 100%average Annualrainfall 25%groundwater (infiltration)
  7. 7. Water Balance BEFORE Development Simplified
  8. 8. The Water Balance Model Water Quantity After 0” baseflow (infiltration) reducedevapo- transpiration 100%rainfall yearlyavg 98% runoff 2%evapo- transpiration Reduced infiltration
  9. 9. Water Balance AFTER Development Example: EVERYWHERE
  10. 10. “Before” & “After” Runoff Compared 0.5% runoff 98% runoff
  11. 11. Runoff: A Watershed Perspective in the West Hills • Flooding, landslides and stream bank erosion
  12. 12. The Water Balance Model Water Quality Before Some sediment
  13. 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. 14. Restore the Soil: Lawn Areas Runoff prevented = 50%
  15. 15. Restore the Soil: Perennial Garden Areas Runoff prevented = 80%
  16. 16. Restore the Soil: Meadows Runoff prevented = 65%
  17. 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. 18. Lots of great information at soilsforsalmon.org
  19. 19. Contained Planters (Over Hardscapes)
  20. 20. Contained Planters (Over Impervious Area) Runoff prevented = 50%
  21. 21. Minimize Impervious Pavement Depaving Runoff prevented varies depending on what replaces the pavement, lawn or perennial garden.
  22. 22. Lots of great information at depave.org
  23. 23. Tree Planting
  24. 24. Porous Walkway & Patio Surface Types Homemade paversGrass-crete Flexible Pavements (GrassPave ) Commercial pavers Boardwalks/decksWood chips (pedestrian only) Gravel
  25. 25. Typical Permeable Paver Section
  26. 26. Porous Walkways Runoff prevented = 90%
  27. 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. 28. Ecoroof/Green Roof Runoff prevented = 50%
  29. 29. Conveyances & Flows
  30. 30. Issues to look for • Drainage problems, like water pooling in your yard. • Bare spots
  31. 31. Issues to look for • Erosion: Stream banks
  32. 32. Issues to look for • Erosion: Garden areas
  33. 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. 34. Permitting
  35. 35. Operations & Maintenance
  36. 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. 37. Thank You!
  38. 38. Rain Barrels
  39. 39. Rain Barrels: Food for Thought
  40. 40. Rain Barrels: Landscape
  41. 41. Rainwater Harvesting: L andscapes A Watershed Perspective
  42. 42. Rainwater Harvesting: Indoor Uses
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×