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• were used . Peak flows were determined usin, methods pre- <br /> sented in Section including U . S . Geological Survey Water <br /> Supply Paper 1683 (Patterson and Somers , 1966) <br /> b . Flow characteristics <br /> Stream monitoring data summarzing flow <br /> measurements collected by Mid-Continent on Coal Creek and <br /> its tributaries are presented in the Willard Owens Report <br /> (Table 783 . 16-6, Appendix III-E-1) . The location of the <br /> discharge monitoring sites are indicated on Figure 783 .16-3 <br /> of that report . <br /> A review of the flow data indicates peak <br /> flows occur during late spring and early summer months due <br /> to melting snow packs , with low flows occurring during the <br /> • late fall and winter months . This rar_ge of flow for Coal <br /> Creek and it tributaries during 1978 , 79 & 80 is illustrated <br /> in Figures III-E-3-a thru j . The difference in flow charac- <br /> teristics between the Coal Creek drainage and a larger <br /> drainage such as the Crystal River occurs during the winter <br /> months when stream flow is kept to a minimum (2 .0 cfs , 1977- <br /> 78) (Table 783 . 16-3 , Appendix III-E-1) due to freezing . <br /> Flood discharges for Coal Creek drainage <br /> basin have been calculated and are tabulated in Table <br /> 783 . 16-7 , Appendix III-E-1 (Flood discharge for Coal Creek <br /> and Major Tributaries) , and are graphically represented on <br /> Figure 783 . 16-5, Appendix III-E-1 . These calculations for <br /> • various storm frequencies are based on equations from the U . <br /> S . Geological Survey Water Supply Paper 1683 . The perennial <br /> drainages calculated in the Coal Creek drainage area are <br /> 15 <br />