(A) Erosion and sedimentation control measures, structures, and devices shall be planned, designed, and constructed to provide protection from the runoff of a ten-year storm that produces the maximum peak rate of runoff as calculated according to procedures in the United States Department of Agriculture, Natural Resources Conservation Service's "National Engineering Field Handbook 630 (Handbook 630)." This document is herein incorporated by reference including subsequent amendments and editions, and may be accessed at no cost at https://www.nrcs.usda.gov/wps/portal/nrcs/detail full/national/water/manage/hydrology/?cid=stelp rdb 1043063. Other methodologies may be used if based on generally accepted engineering standards that are shown to be equivalent to or improved over the procedures in Handbook 630. The approving authority shall determine acceptability of an alternative methodology based upon a showing that the runoff model used was based on observed data in agreement with the predictive model.
(B) The Sedimentation Control Commission and DEQ have created and adopted a North Carolina Erosion and Sedimentation Control Planning and Design Manual describing recommended sedimentation control techniques for construction activities. This is an acceptable resource for design of the erosion control plan.
(Ord. 2020-09-07, passed 9-21-20)