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Clean Water Services LOW IMPACT DEVELOPMENT APPROACHES HANDBOOK

Clean Water Services LOW IMPACT DEVELOPMENT APPROACHES HANDBOOK. The LIDA Handbook. Prepared by: Clean Water Services Internal Staff GreenWorks PC Lori Faha In Cooperation with the Tualatin Basin Natural Resources Coordinating Committee. LIDA Handbook Purpose.

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Clean Water Services LOW IMPACT DEVELOPMENT APPROACHES HANDBOOK

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  1. Clean Water Services LOW IMPACT DEVELOPMENT APPROACHES HANDBOOK

  2. The LIDA Handbook Prepared by: • Clean Water Services • Internal Staff • GreenWorks PC • Lori Faha • In Cooperation with the Tualatin Basin Natural Resources Coordinating Committee

  3. LIDA Handbook Purpose • The Clean Water Services Design & Construction Standards (2008, as amended) present Low Impact Development Approaches as an option for meeting stormwater quality requirements and refer to the LIDA Handbook. • The LIDA Handbook provides detailed design guidance for LIDA facilities.

  4. Handbook Overview • Chapter 1 – Introduction • What are LIDAs & why use them • Chapter 2 – Site Planning for LIDAs • Site Analysis & Planning for LIDAs • Selecting LIDAs to match site conditions • Chapter 3 – LIDA Design Process • Design steps, LIDA Sizing Form • Chapter 4 – LIDA Fact Sheets • Specific design info for each LIDA • Appendices • Glossary, additional resources, maintenance, detail drawings

  5. LIDA Handbook Applicability • When to Use • Site planning and design stages for projects inside CWS service area • When designing any water quality facility or LIDA (contains info for both) • Use in conjunction with CWS Design & Construction Standards

  6. What Are LIDA’s? LIDAs offer more options to comply with stormwater management requirements, and complement the water quality facilities and vegetated corridors that have been established as part of the Standards. The five objectives of LIDA are to: 1. Conserve Existing Resources 2. Minimize Disturbance 3. Minimize Soil Compaction 4. Minimize Imperviousness 5. Direct Runoff from Impervious Areas onto Pervious Areas

  7. LIDA SWALE GREEN ROOF

  8. POROUS PAVEMENT VEGETATED SWALE

  9. EXTENDED DRY BASIN CONSTRUCTED WATER QUALITY WETLAND

  10. INFILTRATION PLANTER

  11. FLOW-THROUGH PLANTER VEGETATED FILTER STRIP

  12. Why LIDA? • LIDAs add more options to the toolkit of stormwater management techniques • LIDAs will reduce flashy runoff flows and other impacts of urban development on stream health • LIDAs can help the County and Cities meet Tualatin Basin Goal 5 plan

  13. Developer Incentives • LIDAs may be integrated with site landscaping • LIDA design may reduce earthwork and piping • Planning Dept’s may offer density or building size bonuses or other incentives • LEED credits

  14. Encouraging LIDA’s in Site Planning • Effective Stormwater Management is best achieved through integration of stormwater objectives at the beginning of site planning.

  15. Site Design Process Using LIDA • Conserve Existing Resources • Minimize Disturbance • Minimize Soil Compaction • Minimize Imperviousness • Direct Runoff from Impervious Areas onto Pervious Areas

  16. How to Select LIDA Facilities • Considerations: • Infiltration vs. flow-through facilities • Public vs. private facilities • Adjacency of Vegetated Corridors

  17. Integrating LIDAs Into Site Design LIDAs IN PARKING AREAS

  18. Integrating LIDAs Into Site Design LIDAs IN STREETS

  19. Integrating LIDAs Into Site Design LIDAs FOR BUILDINGS & ADJACENT AREAS

  20. LIDA Design – Fact Sheets

  21. Appendices • Glossary of terms • Web links to additional resources • O&M • CAD Details

  22. LIDA Operation & Maintenance • Maintenance Agreement Requirements • Maintenance Checklists: • Overview • Use as an inspection & enforcement tool

  23. Carrie Pak, PEEngineering Division Managerpakc@cleanwaterservices.org503.681.3646

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