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Stormwater Management and Elements of Low Impact Development

Stormwater Management and Elements of Low Impact Development. Protecting Our Water Resources – An Ecological Approach to Land Care & Design Chatham Community Center November 16 , 2013. Rich Claytor Horsley Witten Group, Inc. 508-833-6600. Today’s Agenda.

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Stormwater Management and Elements of Low Impact Development

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  1. Stormwater Management and Elements ofLow Impact Development Protecting Our Water Resources – An Ecological Approach to Land Care & Design Chatham Community Center November 16, 2013 Rich Claytor Horsley Witten Group, Inc. 508-833-6600

  2. Today’s Agenda • The basics of stormwater and watershed management • The evolution of stormwater management towards Low Impact Development(LID) • Examples of LID Practices

  3. Stormwater basics What is a watershed? A: a building for water storage B: the land area that drains to a given water body C: a shack from which fishing occurs D: a moment in time when you cross into a new area E: a new way of organizing environmental agencies Watershed Hydrology http://planetearth.nerc.ac.uk/features/story.aspx?id=668

  4. Stormwater basics Urbanization results in increased surface runoff BEFORE AFTER

  5. Components of Impervious Cover in the Urban Landscape

  6. Stormwater basics At ~10% impervious we begin to see: • Water quality issues • Impacts to biological communities • Increased flooding • Stream erosion • Loss of recreational uses • Shellfish bed closures • Reduced baseflow and recharge

  7. Low Impact Development (LID) Large Conventional BMPs Community Planning LID BMPs LID Site Design Receiving Waters

  8. LID Site Planning and Design Approach Objective - to provide a process by which LID is considered at an early stage in the planning process to prevent stormwater impacts rather than mitigate them.

  9. MANAGE AVOID REDUCE AVOID MANAGE MANAGE REDUCE

  10. Low Impact Development (LID) LID Traditional Design • Site fingerprinting • Preserve natural areas • Retain key pervious areas • Residential • Narrow streets • Alternative turnarounds • Smart sidewalks • Shared driveways • Reduced setbacks • Open section roads • Downspout disconnection • Non-residential • Pervious spillover parking • Maximum parking ratios • Shared parking • Reduced stall dimensions • Mass clearing and grading • Loss of trees • Compaction of native soils • Residential • Wide streets and cul-de-sacs • Sidewalks to nowhere • Lots of turf • Curb and gutter • Ponds • Non-residential • Big parking lots • Minimum parking ratios • Large stall dimensions

  11. Low Impact Development (LID) Traditional LID Site Design BMPs

  12. Low Impact Development (LID) Traditional controls LID controls Goal: Reduce the amount of surface runoff by reducing impervious cover and preserving natural areas Rely on small, distributed on-site practices Infiltrate or reuse as much as possible; filter before discharge Source controls to minimize pollution Stormwater is a resource • Goal: Get the water out of here as fast as possible • Collect and storage in big, “hole in ground” off-site • Pipe discharge to a stream or wetland • Limited water quality treatment and infiltration • Stormwater is a waste product

  13. Which of these is not LID? A B C D

  14. Which of these is not LID? B A C D

  15. Which of these is not LID? A B D C

  16. Which is not considered LID? A B C D

  17. LID Practice Library: Bioretention

  18. Bioretention Retrofit

  19. LID Practice Library: Bioretention

  20. LID Practice Library: Bioretention

  21. LID Practice Library: Rain gardens

  22. LID Practice Library: Planters

  23. LID Practice Library: Tree pits

  24. LID Practice Library: Porous Pavement

  25. LID Practice Library: Porous Pavement

  26. LID Practice Library: Infiltration

  27. LID Practice Library: Infiltration

  28. LID Practice Library: Green/blue roofs

  29. LID Practice Library: Green/blue roofs

  30. LID Practice Library: Swales

  31. LID/GI Practice Library: Gravel wetlands

  32. Resources There are many… • MA Smart Growth/Smart Energy Toolkit • MAPC LID checklist • Town of Franklin Best Development Practices Guidebook • RI Community LID Site Planning and Design Guidance Document • Better Site Design Handbook (CWP) • NH Innovative Land Use Planning Techniques

  33. Questions?

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