Green Infrastructure for Flood and Stormwater Mitigation

1. Flood and Stormwater Mitigation Using Green Infrastructure Kari Mackenbach, Green Initiatives Practice Leader, URSChristine Worley, URS

2. Incorporate Green Infrastructure What is Green Infrastructure? How does it relate to stormwater and flood management? What are the site selection criteria? What are costs and operation and maintenance concerns?

3. Green Infrastructure • Natural and managed green areas in both urban and rural settings, • Strategic connection of open green areas, • Treating rainwater as a resource and not as trash to be discarded as quickly as possible, • Transforming “grey” infrastructure to green through restoration of watersheds to slow and store water, and • Providing multiple benefits for people.

4. What Else Can Green Infrastructure Do? • Help communities come closer to attaining their requirements (CWA, MS4, NPDES, CSO, Chesapeake Bay TMDL, etc.) • Enhance public perception (sustainable cities) • Leverage State and Federal program dollars (brownfield redevelopment) • Opportunity to “marry” two forms of public work effort (street, sidewalks, stormwater management)

6. Even your home has a big impact on stormwater runoff House Driveway Stormdrain Street

7. + “Green Concrete” Compacted Lawn 8,390 s.f. “impervious” x 1” rain (if infiltrates first ¼” of rain) = 3,880 gallons of runoff In a 1” rainfall Potential Runoff: 5,422 gallons 1,500 s.f. house (& patio) x 1” rain= 925 gallons of runoff 1,000 s.f. driveway x 1” rain= 617 gallons of runoff 2,500 s.f. “impervious” x 1” rain = 1,542 gallons of runoff Stormdrain Street

8. Where can rain soak in?

9. Q - How Do We Protect Our Streams? A - Manage How Stormwater Runs Off the Landscape Photo: Rusty Schmidt

10. Distributing Stormwater Controls Close to Runoff Sources Regional Traditional Techniques Distributed Stormwater Features

11. Green Roof Applications

12. Pervious Infrastructure

13. Rain Gardens & Bio-Infiltration Devices

14. Green Infrastructure in Your Backyard! Local Challenges Local Opportunities

15. CONSTRUCTING GREEN SOLUTIONS ON EVERY STREET

16. RESIDENTAL RETROFIT VISUAL

17. RESIDENTIAL RETROFIT RAINGARDEN

18. RESIDENTIAL RETROFIT-PERVIOUS PAVERS

19. Green infrastructure does not replace gray infrastructure. Can reduce the capital costs and O & M costs of gray technology. $ $ $ http://www.coxconcrete.com/products/rcp/index.html

20. The Green Behind the “Green”

21. RIGHT-SIZING STRATEGY

22. Burnsville, MNPaired Study of Residential Street Runoff Control Diagram courtesy of the City of Burnsville, MN from their Burnsville Stormwater Retrofit Study

23. 17 Rain Gardens InstalledBurnsville, MN Diagram courtesy of the City of Burnsville, MN from their Burnsville Stormwater Retrofit Study 5.3 acres treated and 7.5 acres controlled Average treated lot < .5 acres Average total rain gardens < 1 acre

24. AFTER Neighborhood Application Burnsville, MN Residential Neighborhood Rain Garden Retrofits Long-Term Monitoring BEFORE Photos Courtesy of Rice Creek Watershed District

25. Burnsville, MN Blue: Control Red: With Rain Gardens Diagram courtesy of the City of Burnsville, MN from their Burnsville Stormwater Retrofit Study

26. Site Specific/Neighborhood Application • Create a “First of its Kind” • Municipal scale rain garden • Educate the public • Design model for rain gardens • Balances security and openness • Low impact/low maintenance • Use innovative design measures FEMA Supported, FEMA Funded.

28. Opportunities, Incentives & Regulatory Regional ApplicationsLarge Cities Initiatives

29. Kansas City, MO Educating the public about water quality, sewer and stormwater concerns Promoting green solutions Encouraging funding for required sewer and stormwater improvements

30. Montgomery County, MD RainScapes Program • Provides rebate rewards to property owners for LID practices http://www.montgomerycountymd.gov

31. LOUISVILLE, KY. OVERVIEW • Flood Protection • Wastewater Treatment • Stormwater Management

32. EVALUATION OF GREEN VS. GRAY Develop Case Study Template Cost per Gallon Gallons Removed Long-term Trends Standardize Design Criteria and O&M Standardize Green Modeling Parameters Target Pilot CSO Basins for Right-Sizing CLEAN, GREEN, GROWING COMMUNITY

33. GREEN TOOLS

34. COLLABORATION ON GREEN

35. FIRST CRADA COMMUNITY • 3 Year Effort-potential for up to 10 years • EPA’s involvement in Green Infrastructure validation process • Establish gallons removed compared to gray • Evaluate and establish long term trends • Standardize Design Criteria/O&M • Standardize Modeling Parameters • Other Ancillary Benefits • Partner with University of Louisville

36. US EPA ORD PARTNER • Monitoring Lead • GMP Selection QA/QC

37. MONITORING IN LOUISVILLE

40. CSO 130 RESULTS

41. Wrap UP Green Infrastructure can: • Be implemented on a site, neighborhood, or regional level • Help manage flooding and stormwater • Protect our streams • Be cost effective • Provide multiple benefits • Help communities meet environmental requirements • Improve public perception

42. Questions? Kari Mackenbach – Kari.Mackenbach@URS.com Christine Worley – Christine.Worley@URS.com