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Gravity Sewer Minimum Design Criteria

1,400 copies of this document were printed at a cost of $ , or $ per copy. Minimum Design Criteria for the permitting of Gravity Sewers Adopted by the Division of Water Quality on February 12, 1996 Updated to 15A NCAC 2T Regulations on March 2008 GS MDC 03/08 2 Gravity Sewer Minimum Design Criteria I. APPROVAL OF SEWERS A. The Division of Environmental Management shall approve new construction, extensions into new areas, and replacement sewers. The County Health Departments will review and approve all collection systems which connect to a subsurface treatment and disposal facility. Design submittals shall not include flow from rainwater, storm sewers, streets or groundwater.

3. Minimize Solids Deposition The pipe diameter and slope shall be selected to obtain the greatest practical velocities to minimize settling problems. Designs must include a minimum scouring velocity of 2 feet per second. Sewers shall not be oversized to justify using flatter slopes. If the minimum

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