Laserfiche WebLink
783 . 16-7 , Flood discharge for Coal Creek and Major Tributaries and <br /> are graphically represented on Figure 783 . 16-5 . These <br /> • calculations are based in equations from the U.S . Geological <br /> Survey Water Supply Paper 1683 and provide flood discharges <br /> for various frequencies . The perennial drainages calculated <br /> in the Coal Creek drainage area are Coal Creek, Dutch Creek, <br /> Bear Creek, Oilwell Creek, and Porcupine Creek. These <br /> drainages are in Hydrologic Area 5 and Flood Frequency <br /> Region A (Pattersen & Somers, 1966) . It should be understood <br /> that the flood discharges are estimates based on regional <br /> application. Site conditions such as vegetation and land <br /> use will affect the actual results to some degree. The calcula- <br /> tions provide a method of comparison for the various drainages <br /> and a basis for estimation of flood impact . <br /> • A 100-year flood occurred on July 24, 1977, on Coal Creek. <br /> A description of this event is given in Appendix C . This <br /> event was also monitored at the stream gaging station on the <br /> Crystal River above Avalanche Creek. Estimates of stream <br /> flow were listed as 1000 cfs . <br /> Water Quality <br /> Mid-Continent Resources has established 11 surface water <br /> monitoring stations in the Coal Creek drainage basin. These <br /> stations are located to effectively monitor water quality in <br /> the streams draining the mine area. The monitor sites are <br /> situated as shown on Figure 783 . 16-6, - �'� and tabulated <br /> • below: <br /> 9 <br />