Temporary stormwater diversion shall comply with the following:
- (a) When necessary to minimize release of sediment-laden runoff prior to stabilization of the site and the permanent stormwater management system components, sediment-laden water shall be diverted and stored in temporary diversion practices such as sediment basins or trenches;
- (b) Subject to (c), below, temporary diversion practices shall be stabilized prior to receiving runoff;
- (c) Temporary diversion channels with a gradient of 2% or greater shall be stabilized. However, channels with a slope of less than 2% shall be stabilized only if erosion is observed;
- (d) The area draining to each temporary diversion practice shall be less than 5 acres;
- (e) Temporary diversion channels shall convey, and temporary basins and trenches shall contain, the 2-year, 24 hour design storm without overtopping the banks;
- (f) The bed slope of diversion channels shall have a positive grade to assure drainage;
- (g) Where diversions carry concentrated flows, energy dissipation methods shall be implemented to disperse flow into areas downstream of the disturbed area;
- (h) If erosion of temporary diversion practices occurs during construction, corrective action shall be taken to stabilize the basin, channel, and berm; and
- (i) Diversion basins and trenches shall be cleared of sediment whenever sediment accumulates.
Source. #9343, eff 1-1-09; ss by #12342, eff 8-15-17; ss by #13758, eff 9-28-23; ss by #14472, eff 1-19-26, EXPIRES: 1-19-36