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In conclusion, there are no signigicant trends that would <br /> indicate a problem with the function of the diversion or adverse <br /> impacts upon water quantity or quality as a result of mining. <br />Sediment Pond <br />Flows <br />Flows from the sediment pond were derived from precipitation <br />events occasionally supported 6y mine flaws. The designed flow <br />for the sediment pond dewatering pipe is 1.0 cfs. The vast- <br />majority of time there was no discharge or a discharge of less <br />than 0.1 cfs. The greatest discharge occurred on 6-1-86 with a <br />• flaw rate of .83 cfs. Compared to the flows of the permanent <br />diversion, up to 26 cfs, the sediment pond contributes a meager <br />amount of water to Raton Creek. Raton Creek typically flows <br />greater than 5,000 cfs per the FHF report. <br />The greatest problem associated with the surface water control <br />system pertained to maintenance. Although design criteria were <br />appropriate, the steeper grades on the sediment collection ditch, <br />when subjected to heavy rainfalls, resulted in erosion and <br />subsequent rapid utilization of the sediment storage capacity. <br />To correct the problem, silt fences and silt fences supported by <br />gabion dams were constructed. This resulted in aggradation of <br />the previously eroded sediment collection ditch. Improved water <br />• quality was made possible by the structural additions. <br />172 <br />