Additional Details of the New Coastal Stormwater Rules

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Additional Details of the New Coastal Stormwater
Rules
North Carolina Division of Water Quality
Coastal Rule Workshops September 2008
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Terms and Definitions

• Mainly Restate Existing Definitions
• Does Not Change Credit for Permeable Pavement
• Common Plan of Development
• Buffer or Setback

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Coverage

• Sediment/Erosion Plan Approval or CAMA Major
• Nonresidential 10,000 sq.ft. Built-Upon
• Residential Near SA Waters
• Will Also Result in More CAMA Majors

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Low Density Items

• Wetlands and BUA Calculations
• Coastal Wetlands Excluded from Calculation
• Show DCM Delineation on Plans
• Old Pockets of High Density Replaced
• More Flexible Implementation
• Development in Upland Areas
• SR Waters Removed

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High Density Items

• More BMP Types Mentioned
• Wet Ponds Allowed Near SA Waters
• With Secondary BMP (in series) to Treat Discharge
• Seasonal High Water Table Separation
• Two Feet Required Relief May Be Allowed
• No Minimum Separation for Secondary BMP
• Secondary BMP Must Show Proper Function

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High Density Items Cont

• BMPs Allowed in Buffer Except Wet Ponds
• Reviewing Filter for Runoff in Excess of Design
• BMP Discharge

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Other Items

• Flow Through Wetlands
• Non-erosive flow for 10-Yr storm
• Permit Conditions to Maintain
• Redevelopment
• Equal or Less BUA and Equal or Better Stormwater
  Control
• Excluded No Permit

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Other Items

• Extent of SA Waters DWQ Identification Method
• Buffer Items
• Exemptions Consistent with CAMA Allowances
• Minor Variances Granted by DWQ NSW Variance
  Reference
• Municipal NPDES Stormwater Permits

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Information Sources
Division of Water Quality Stormwater Permitting
Unit http//h2o.enr.state.nc.us/su/stormwater.htm
l Coastal Stormwater Rule Changes http//h2o.enr.
state.nc.us/su/coastal.html State Stormwater
Education http//www.ncstormwater.org