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Stormwater Regulations

Learn about the importance of stormwater management, the impacts of stormwater runoff on water quality, and the regulations in place to protect our water resources. Discover strategies for minimizing impervious cover, implementing passive stormwater management, and complying with NPDES requirements.

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Stormwater Regulations

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  1. Stormwater Regulations NC Division Of Water Quality DPPEA Technical Sharing Session May 25, 2004

  2. Why Be Concerned About Stormwater • Increased Imperviousness • Increased Runoff • Increased Pollutants • Impacts to Streambanks • Erosion/Sedimentation

  3. Why be Concerned about Stormwater? Declining water quality Increasing demand for clean water Urbanization: Population doubling every 50 years 88% increase in urban area from 1982-1997 (USDA-NRCS)

  4. State Stormwater Programs • State Stormwater Management Program • Water Supply Watershed Protection Program • 401 Water Quality Certification Program • Nutrient Sensitive Waters Programs

  5. General Management StrategyState Stormwater • New Development / Redevelopment • Minimize Impervious Cover-12% to 30% BUA • Use Passive Stormwater Management • Engineered Controls Where Necessary, to remove 85% TSS • Approvals From State or Local Gov.

  6. NPDES Stormwater • Phase I • Industrial Activities • Construction Sites  5 acres • Large and Medium MS4s • Phase II • Small MS4s • Construction Sites  1 acre • Industrial No-Exposure Certification

  7. NPDES Industrial Coverage • Manufacturing/Process Type Activities • Private and Public Entities • Comprehensive Stormwater Pollution Prevention Plans • Regular Review and Assessment

  8. Construction NPDES Coverage • Required In Addition to E&SC Plan • Point Source Discharges of Stormwater • Projects Greater Than One Acre

  9. Permit ConditionsLimitations & Controls • Submit and Receive Approved E & S Plan • Comply With Approved E & S Plan • Materials Handling - fuel, oil, waste, etc. • Chemical Application - fertilizers, etc. • Operation and Maintenance

  10. Municipal NPDES Coverage • Automatically Designated - Urbanized Areas • State Designated Public Entities • Petitioned Entities That Are State Designated

  11. 2000 USA Census Urbanized Areas • Automatic designation by USEPA of municipal separate storm sewer systems (MS4s)

  12. North Carolina NPDES Stormwater ProgramAutomatic Coverage North Carolina - NPDES Stormwater Program

  13. North Carolina NPDES Stormwater ProgramAutomatic & Possible State Designation North Carolina - NPDES Stormwater Program

  14. Minimum Control Elements • Public Education and Outreach • Public Involvement/Participation • Illicit Discharge Detection & Elimination • Construction Site Runoff Control • Post-construction Stormwater Management • Pollution Prevention/Good Housekeeping

  15. Post Construction Runoff Control New development and redevelopment 1-year / 24-hour storm control 85% average annual TSS removal Operation & maintenance of BMPs Specific requirements for Class SA, Tr, NSW

  16. Penalties for Noncompliance • Penalty not to exceed $25,000 per day per violation.

  17. Information Sources Division of Water Quality Stormwater and General Permits Unit http://h2o.enr.state.nc.us/su/stormwater.html Environmental Protection Agency http://cfpub.epa.gov/npdes/

  18. GROUTED RIP RAP ENERGY DISSIPATOR

  19. Grouted rip rap replaced with “wet meadow” and sediment forebay

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