Political, economic and engineering challenges for reducing sediment loads in streams in the Georgia piedmont
Freshley, Philip D.
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Monitoring of turbidity of storm water runoff from construction sites and the storm flow in receiving streams is required under Georgia’s NPDES program (General Permit No. GAR 100000). Current standards for in-stream and effluent water quality are more stringent than the capabilities of current erosion and sediment control practice, and in many cases, less than sediment concentrations in streams in undeveloped watersheds. Permit holders have significant liability in non-compliance. Separating runoff impacts from instream variability is difficult. Fine clay particles common in the regions soils are difficult to remove from runoff. Modification of standards to recognize different levels of BMP performance, and utilizing storm flow data from undisturbed watersheds as a baseline is recommended.