The Drainage Criteria Manual effective date is September 1, 2024.  The updated Drainage Criteria Manual implements requirements associated with desired NCTCOG iSWM outcomes associated with:

• Hydrologic Methods
• Flow Velocities
• Stormwater Detention
• Flood Mitigation
• Downstream Assessments
• Roadway Drainage
• Water Quality

Link to the Drainage Criteria Manual (PDF)

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