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RULE 2 PERMITS <br /> Wilson Creek, a perennial stream, also shows the dependency on runoff related events for large <br /> volumes of water. Mean monthly flows exhibit more consistency throughout the dry months as <br /> evidenced by a constant base flow ranging from 0.25 to 0.34 cfs in 1978, an extremely dry year. <br /> Wet year conditions in 1980 resulted in mean flows about three to four times higher than the dry <br /> year condition. However, low flows in late summer and early fall still range around 1.0 cfs; a <br /> limited water supply is indicated. During the spring runoff of 1984, several drainages experienced <br /> high levels of erosion. See the 1984 Annual Report for additional information of the impacts to <br /> Wilson Creek from high runoff that year. <br /> Maximum and minimum flow values on Wilson Creek exhibit less flashiness than Taylor Creek, <br /> but still show the highly runoff related response of this drainage to snowmelt and rainstorms. The <br /> highest flow recorded for Wilson Creek during the period was 43.0 cfs in May, 1979. May of 1980 <br /> had a recorded value of 41.0 cfs reflecting high precipitation and possibly some snowmelt <br /> contribution. Late summer and early fall maximums and minimums reflect little precipitation and <br /> a very low base flow probably contributed by bank storage and the minimal groundwater in the <br /> area. <br /> Goodspring Creek, designated as an Alluvial Valley Floor area(although located in an upland area <br /> and containing colluvial deposits),has similar characteristics to Wilson Creek. Mean monthly flow <br /> values are generally lower and sustained dry year base flows are less than 0.1 cfs. Waterflow in <br /> the valley floor is restricted by plant evapotranspiration and movement through the valley deposits. <br /> Therefore flow values, themselves, may be misleading. Maximum and minimum flow values are <br /> also substantially less flashy than Taylor Creek. Maximum values are not as high as Wilson Creek <br /> and this is also due to the evapotranspiration of plants and the infiltration of water into the valley <br /> deposits prior to channel interception. Minimum base flows are extremely low, much lower than <br /> for Wilson Creek, and ranged around 0.01 to 0.06 cfs in late summer and early fall of 1977. <br /> Monthly flow data for each of these drainages are presented in Figures 2.04.7-3, 2.04.7-4, and <br /> 2.04.7-5. These figures are a graphical representation of the data presented in Table 2.04.7-8 and <br /> further show the seasonality of flow and runoff responses of each of the watersheds. Seasonal <br /> sustained flow values are nonexistent for Taylor Creek. Sustained seasonal flows in Wilson Creek <br /> and Goodspring Creek show the predominant influence of snowmelt runoff in the spring and early <br /> summer months with flows decreasing in late summer and early fall to baseflow conditions. This <br /> trend is confirmed with the additional flow data obtained by Colowyo and presented in the Annual <br /> Reports. <br /> Hydrologic Balance <br /> An integral part of any watershed study is the hydrologic balance or fate of precipitation in the <br /> watersheds. Since recharge and infiltration rates are low (see Groundwater Section presented <br /> earlier), precipitation is highly variable by season and by month, and evapotranspiration rates are <br /> high,the water balance is most applicable to long-term estimation of average streamflow volumes. <br /> A typical water year (October 1974 through 1975) was used as the basis for the calculations <br /> presented in Tables 2.04.7-9, 2.04.7-10, 2.04.7-11, and 2.04.7-12. <br /> Table 2.04.7-91 dis71 a summary of the water balance estimates for Goodspring, Taylor and Wilson <br /> ch <br /> Clcs basad 011 iainage aica iii Jquaic macs(111?), el ipitatio111ii iiGlies(iii),cvapotiaiispiiatioii <br /> Rule 2 Permits 2.04-23 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />