1. using trees to reduce stormwater runoff

2. stormwater runoff is the number one factor in the decline of urban streams and decreasing urban water quality !

10. challenges… Urban Foresters Engineers/ Planners Now remember, you have to work together Leftover disturbed areas are not the only place for trees We can retain valuable trees that improve watershed functions We can use trees in SW practices if we design it differently We need wider streets and curbs Keep the trees in the park, we need the tax revenue Don’t worry, we’ll come back and plant trees later.

14. Historic Approach to Stormwater Management: move water off the site as quickly as possible

15. typical stormwater pond with no trees More recent approach is to temporarily detain runoff to control peak flows – this does not reduce the volume of runoff or mimic pre-development hydrology

16. What opportunities are we missing?

18. Stormwater projects can reduce water quantity, improve water quality…and be beautiful.

20. Stormwater practices can be amenities for people…

22. how do we get there?

24. Wooded Wetland Third Generation The Forested Wetland—water quality + tree benefits

25. Tree Clusters in Stormwater Ponds and Wetlands

26. Bioretention with trees

27. tree check dams tree check dam section tree check dam axon

28. Alternating side slope plantings

29. Multi-zone filter strip

30. Forested filter strip

31. linear stormwater tree pits

32. stormwater drypond

34. stormwater drypond

36. schools

37. parks

38. forest cover in parks limits runoff

39. highway right of way

41. vacant lots are a good opportunity for reforestation and neighborhood beautification

42. Combining Reforestation and Soil Compost Amendments to Restore a Vacant Urban Lot

43. Reforesting stream buffers provides stream shading, bank stabilization, pollutant removal and other benefits

44. planting under utilities

45. Plant Trees During Development/Redevelopment

46. More shade means more time between repaving. 20% shade on a street improves pavement condition by 11%, which is a 60% savings for resurfacing over 30 years. Planting along local roads

47. local roads median planting

48. Trees planted in a median strip

49. A typical cul-de-sac is a large expanse of pavement with no vegetation

50. Trees can be incorporated into cul-de-sac islands

51. No infiltration of rainfall & limited soil volume Parking Lots

52. Trees in parking lots perimeter

53. What opportunities are we missing?

54. So what’s with turf cover? fastest growing land cover in the US! Sources: MTC (1996), VASS (1998) and PTC (1989) (% of total turf cover)

56. Trees planted on home lawns provide shade and other benefits at maturity

57. Use trees to: block winter winds, shade summer sun, accent important views, and screen private areas Residential landscapes can be functional and beautiful

59. 12th street green street, portland oregon

60. Stormwater runoff from 8000 square feet flows downhill along the existing curb unit. Stormwater planter system reduces intensity of a 25 year storm event by 70% or more.

62. Infiltration = 4 inches per hours

66. Seattle SEA Streets Seattle SEA (Street Edge Alternatives) Streets Project uses graded swales to reduce impervious cover by 11% over traditional streets. Project has decreased stormwater volume by 97 percent.

67. A concept drawing of the $800,000 street edge alternative (SEA) project shows 14-foot-wide curved street, swales, additional trees, vegetation and diagonal parking areas for cars.

68. SEA Streets

69. The Cascade Prototype project at N. 110th St. after most of the construction has been completed and before planting.

72. “ beckoning cistern” by buster simpson Growing Vine, Seattle Washington

74. alternative sidewalk design Traditional sidewalk designs utilize individual tree pits (left) which confine roots; alternative designs cluster trees (right), which allows them to share rooting space. This reduces the need for tree roots to grow under pavement.