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Stormwater Management

Stormwater Management. For Developing Municipalities. What Residents Can Do What Towns Can Do. ACKNOWLEDGEMENTS. CENTER FOR WATERSHED PROTECTION, www.cwp.org www.stormwatercenter.net Tom Schueler, Director of Watershed Research and Practice at CWP

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Stormwater Management

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  1. Stormwater Management For Developing Municipalities What Residents Can Do What Towns Can Do

  2. ACKNOWLEDGEMENTS • CENTER FOR WATERSHED PROTECTION, www.cwp.org • www.stormwatercenter.net • Tom Schueler, Director of Watershed Research and Practice at CWP • NEMO PROGRAM - University of Connecticut, http://nemo.uconn.edu/

  3. Development Means Less Infiltration

  4. Nutrients Pathogens Sediment Toxic Contaminants Debris Thermal Stress

  5. Waterway Health Declines Waterway Health & Imperviousness Imperviousness Increases 80 70 60 50 40 30 20 10 0 WATERSHED IMPERVIOUSNESS (%) DEGRADED IMPACTED PROTECTED STREAM DEGRADATION ADAPTED FROM SCHUELER, ET. AL., 1992

  6. MUNICIPAL ACTION • Public Works • Streets • Playing Fields and parks • Stormwater sewer system • New Development • Planning • Zoning • Maintenance

  7. Culvert and Outfall Opportunity for Retrofit Scenario for erosion

  8. STORMWATER MANAGEMENT ORDINANCE For New Development

  9. Groundwater Recharge Requirement • Maintain Existing (100%) Average Annual Groundwater Recharge post development OR • Infiltrate the Post Development Increase in the 2-year Storm •

  10. (should be in municipal ordinance) Nonstructural SWM Strategies • Protect areas that provide water quality benefits • Minimize & Separate Impervious Cover • Maximize protection of natural drainage features and vegetation • Minimize Disturbance • Minimize Reduction in Time of Concentration • Minimize soil compaction

  11. Provide Low-maintenance Landscaping and use of native vegetation • Provide Opportunities for Reduction of Pollutants at the Source • Trash Racks and Receptacles • Minimize Vegetation That Needs Fertilizers • Use Native Plants • Manage stormwater runoff at source

  12. LAND USE ORDINANCESESTABLISH DESIGN STANDARDS

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