The document discusses ways to improve stream stewardship in the community. It notes several things the community is doing well related to stormwater and development standards. It emphasizes the need to (1) address runoff from existing development, (2) be realistic in efforts to restore streams, (3) continue strong stormwater standards, (4) use incentives for green practices, and (5) select practices with multiple benefits. Ideas discussed include retrofitting streets and properties, adopting standards like a Green Area Ratio, and incentivizing high-quality green spaces.

1. Stream Stewardship What we’re doing well. Ideas from other communities. Kimberly Brewer, AICP February 11, 2012

4. Watershed Improvement- Getting at the Existing Impairment of Our Streams

5. Development Impacts: Runoff Volume Typical pre-development conditions: Runoff = 10% Infiltration = 50% Typical post-development conditions: Runoff = 55% Infiltration = 15%

6. Development Impacts: Overland Pollutant Loading

10. Neighborhood Streets Retrofits

11. Green practices aren’t just pretty gardens…. Dry Well Vegetated Swale Bioretention Area or Raingarden

12. Downtown Streetscape Retrofits

13. DOT Highway Retrofits

14. Public Property Retrofits School micromanaging stormwater throughout the site. Park stormwater detention basin also serving as playing field.

15. Private Property Retrofits

16. Look around. You’ll see lots of retrofit opportunities…

22. Watershed Protection- Performance Standards for New Development

24. Changes in Flow

27. HOW We’re Meeting Performance Standards- Ideas for Greener Approaches

28. The Green Factor and Green Area Ratio: Seattle and Washington D.C. “ Green Area Ratio (GAR) is the ratio of the weighted value of landscape elements to land area. The GAR score relates to an increase in the quantity and quality of environmental performance of the urban landscape”. Pictures courtesy Laine Cidlowski

30. Graphic courtesy Laine Cidlowski GREEN AREA RATIO LANDSCAPE ELEMENTS MULTIPLIER Landscaped area (select one of the following for each area) Landscaped areas with a soil depth of less than 24 in. 0.3 Landscaped areas with a soil depth of 24 in. or more 0.6 Bioretention facilities 0.4 Plantings Ground covers, or other plants less than 2 ft tall at maturity 0.2 Plants at least 2 ft tall at maturity 0.3 Tree canopy for all trees 2.5 in. to 6 in. in diameter 0.5 Tree canopy for new trees 6 in. in diameter or larger 0.6 Tree canopy for preservation of existing trees 6 in. to 24 in. in diameter 0.7 Tree canopy for preservation of existing trees 24 in. diameter or larger 0.8 Vegetated wall, plantings on a vertical surface 0.6 Vegetated roofs Extensive vegetated roof over at least 2 in. but less than 8 in. of growth medium 0.6 Intensive vegetated roof over at least 8 in. of growth medium 0.8 Water features (using at least 50% recycled water) 0.2 Permeable paving Permeable paving over at least 6 in. and less than 2 ft of soil or gravel 0.4 Permeable paving over at least 2 ft of soil or gravel 0.5 Enhanced tree growth systems 0.4 Renewable energy generation (area of) 0.5 Bonuses Native plant species 0.1 Landscaping in food cultivation 0.1

35. High Quality Green Area: Which do we want to encourage?

36. Healthy environment Healthy economy Healthy community Triple Bottom Line

41. February 11, 2012 (1) Address uncontrolled runoff from existing development (2) Be realistic about what can be achieved (3) Build on our strong stormwater performance standards (4) Consider new incentives/requirements for green practices (5) Select practices that provide multiple benefits