Presentation given at Green Connection US event 3/12/2009 Sarasota, FL

2. Michael Clark, PE, LEED AP www.westonandsampson.com Low Impact Development Specifics

4. Courtesy May, U of W Natural Conditions Hydrology 101

5. Courtesy May, U of W Developed Conditions Hydrology 101

8. The Problem Conventional Development Smart Development Reduce land clearing and grading costs Reduced infrastructure costs Protect regional water quality Reduce stormwater runoff The Solution Impacts on open space

9. Conventional Development Centralized Pipe and Pond Controls

10. LID Development Conservation Minimization Soil Management Open Drainage Rain Gardens Rain Barrels Pollution Prevention Disconnected Decentralized Distributed Multi-functional Multiple Systems

13. The standard planning process involves four-steps, after the yield is established. Source: R. Arendt

14. Identify conservation value areas on the site such as wetlands, significant trees or tracts of forest, steep slopes, habitat, cultural resources or buffer zones. Remove these from the “developable area”. 1. Source: R. Arendt

15. Place houses in the remaining area in a way that would maximize residents enjoyment of protected areas by providing access to open space and preserving views. 2. Source: R. Arendt

16. Align roads and trails on the site to provide pedestrian and vehicle access and maximize stormwater management options. 3. Source: R. Arendt

17. 4. Draw lot lines around the homes.

19. Conservation Open Drainage Rain Gardens Amended Soils Rain Barrel Lot Level Source Controls LID Site Porous Pavement Create a Hydrologically Functional Lot Narrower Streets

20. Photo Copyright 1999, Center for Watershed Protection Many roads are much wider than they need to be. Better Site Design of Roadways & Parking Areas

21. Number of Accidents as a Function of Residential Street Width Source: Swift, et. al., 1998

25. SOLUTIONS : Dry Well Infiltration of Roof Runoff Rooftop Runoff to vegetated swale Source: CWP

29. Bioretention Treatment, Retention, Infiltration, Landscaping

30. Ref: Preliminary Sarasota County LID Manual, 2008 Bioretention Plan View

31. Soil / Flora / Fauna Ecological Structure A Dynamic Living Ecosystem Cycling Nutrients, Chemicals and Organic Energy Sources Plants, Bacteria Protozoa, Fungus Worms, Insects Mammals .

33. Bioretention Area Small parking lots

34. Bioretention Applications Urban retrofits High-density areas

40. Green Roof Systems

42. Rain Barrels and Cisterns Runoff Reduction and Water Conservation Large-Scale Applications

44. Stormwater Planters

45. Cohasset L.I.D. Stormwater Retro-Fit Project Lily Pond is Cohasset Drinking Water Supply Control of discharges to Lily Pond required to protect public health and ensure safe Drinking Water Supply

50. Biorentention Soil Mixing Cohasset Stormwater LID Project Demonstration Raingarden at Lily Pond

51. Excavation Cohasset Stormwater LID Project Demonstration Raingarden at Lily Pond

52. Underdrain Cohasset Stormwater LID Project Demonstration Raingarden at Lily Pond

53. Cohasset Stormwater LID Project Demonstration Raingarden at Lily Pond Graded Filter

54. Placement of Bioretention Soil Mix Cohasset Stormwater LID Project Demonstration Raingarden at Lily Pond

55. Planting June 2005 Cohasset Stormwater LID Project Demonstration Raingarden at Lily Pond

56. First Rain Storm Cohasset Stormwater LID Project Demonstration Raingarden at Lily Pond

57. September 2005 Cohasset Stormwater LID Project Demonstration Raingarden at Lily Pond