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

ACKNOWLEDGEMENTS CENTER FOR WATERSHED PROTECTION, Tom Schueler, Director of Watershed Research and Practice at CWP NEMO PROGRAM - University of Connecticut,

Development Means Less Infiltration

Nutrients Pathogens Sediment Toxic Contaminants Debris Thermal Stress

Waterway Health & Imperviousness ADAPTED FROM SCHUELER, ET. AL., STREAM DEGRADATION WATERSHED IMPERVIOUSNESS (%) DEGRADED PROTECTED IMPACTED Waterway Health Declines Imperviousness Increases

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

Culvert and Outfall Opportunity for Retrofit Scenario for erosion

STORMWATER MANAGEMENT ORDINANCE For New Development

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

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 (should be in municipal ordinance)

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

LAND USE ORDINANCES ESTABLISH DESIGN STANDARDS