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• Wilson Creek, a perennial stream, also shows the dependency on runoff related events for <br />large volumes of water. Mean monthly flows exhibit more consistency throughout the dry <br />months as evidenced by a constant base flow ranging from 0.25 to 0.34 cfs in 1978, an <br />extremely dry year. Wei year conditions in 1980 resulted in mean flows about three to four <br />times higher than the dry year condition. However, low flows in late summer and early fall <br />still range around 1.0 cfs; a limited water supply is indicated. During the spring runoff of <br />1984, several drainages experienced high levels of erosion. See the 1984 Annual Report for <br />additional information of the impacts to Wilson Creek from high runoff that year. <br />Maximum and minimum flow values on Wilson Creek exhibit less Flashiness than Taylor <br />Creek, but still show the highly runoff related response of this drainage to snowmelt and <br />rainstorms. The highest flow recorded for Wilson Creek during the period was 43.0 cfs in <br />May, 1979. May of 1980 had a recorded value of 41.0 cfs reflecting high precipitation and <br />possibly some snowmelt contribution. Late summer and early fall maximums and minimums <br />reflect little precipitation and a very low base flow probably contributed by bank storage and <br />the minimal groundwater in the area. <br />Goodspring Creek, designated as an Alluvial Valley Floor area (although located in an <br />upland area and containing colluvial deposits), has similar characteristics to Wilson Creek. <br />Mean monthly flow values are generally lower and sustained dry year base flows are less <br />than 0.1 cfs. Waterflow in the valley floor is restricted by plant evapotranspiration and <br />movement through the valley deposits. Therefore flow values, themselves, may be <br />misleading. Maximum and minimum flow values are also substantially less flashy than <br />• Taylor Creek. Maximum values are not as high as Wilson Creek and this is also due to the <br />evapotranspiration of plants and the infiltration of water into the valley deposits prior to <br />channel interception. Minimum base flows are extremely low, much lower than for Wilson <br />Creek, and ranged around 0.01 to 0.06 cfs in Tate summer and early fall of 1977. <br />\J <br />2.04.7-40 <br />