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commonly occur during May and June in response to melting snowpacks. It is <br />• very doubtful that the peak flow of 36,000 cfs, which occurred in 1935, prior to <br />construction of most of the upstream flood control structures and diversions, <br />would occur again. <br />No flow data is available from U.S. Government sources for Cottonwood and <br />Rapid Creeks. Mid -Continent Resources, however, maintained a four -foot <br />Parshail flume equipped with a water stage recorder from January, 1980 until <br />September, 1981. This flume is located below the confluence of the two creeks <br />but above all diversion headgates. This flow data was presented previously in <br />Table 7-4. This flume is now monitored as site SWGS-01 and additional flumes <br />were installed in 1983 and 1993 to monitor flows above this point. Results of <br />this monitoring have been included in annual hydrologic reports. <br />There is no quality data available from Rapid and Cottonwood Creeks sufficient <br />• to identify seasonal variations. <br />Water quality data for water discharged from the Roadside South Portal is <br />contained in Table 7-1. Water quality data for the Colorado River is contained <br />in Tables 7-8 and 7-9. Additional quality on these and other locations is <br />provided annually to the Division in the annual hydrologic reports. <br />(3) The Colorado River, Rapid Creek, and Cottonwood Creek are the only sources <br />of water for beneficial use within the permit area and adjacent area. Mining <br />operations are not expected to result in measurable contamination, diminution, <br />or interruption of the water in these identified sources. Approximately 650 acre- <br />feet of water per year are pumped from active mine working. From here the <br />water is discharged into the Colorado River under the conditions of the current <br />NPDES permit held by the applicant. <br />0 7-15 (New 3/1/96) <br />