1. Projecting Buildout Conditions in the Hood Canal Watershed
Impervious Surface Estimates for Watershed Planning and Salmon Recovery

2. Gretchen Peterson Scott Brewer

4. Buildout Analysis

7. SEATTLE

11. Impervious Surface:

12. Impervious Surface:
How much?

13. Impervious surfaces increase stormwater velocity and volume, causing:

14. Erosion

15. Sedimentation

16. Disturbance to spawning and rearing areas

17. Low pollutant filtration

20. 2003 Impervious Data +
2003 Land Use Data =

21. Land Use Category Avg. Imperviousness Commercial Services …….. 32.41%
Rural…………………………
7.02%
Urban Low ………………….
21.14%
Parks ………………………..
5.51%

25. Medium Density
Residential

27. No end date

32. Implications
Nearshore:
Restoration and protection may be warranted

33. Implications
Basins:
Only 1 watershed with a summer chum stream builds out to >= 10% impervious

34. Implications
Basins:
Are regulations being followed?

35. Implications
Basins:
Will regulations change?

36. Implications Riparian Corridors:
Restoration and protection may be warranted

37. Further Work: Stream-gauge correlations 2006 update
Building permit data analysis

38. Report Available At:

39. Special Thanks To: Scott Brewer, Hood Canal Coordinating Council
Dave Nash, Kitsap County Dept. of Community Development
William Huber, Quantitative Solutions
Doran Geise, now of ViziWorld
Lawrence Lessig, Stanford, presentation method