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• amount of water actually yielded however, is likely lower because <br />of the presence of stock-watering ponds. <br />Water yielded from the stream comes mainly as surface runoff in <br />direct response to thunderstorms and/or snowmelt originating at <br />higher elevations. Groundwater discharge may contribute a small <br />amount on a local basis during the snowmelt season. During the <br />1979 portion of the inventory period, runoff events occurred at <br />a crest gage station located near the mouth of the basin (see <br />section II.C for more information). Estimated peak flows of 94, <br />8, and 42 cubic feet per second were produced. The first flow <br />was resultant from snowmelt, while the last two were thunderstorm <br />• related. Because of the general proportional relationship between <br /> peak flow and runoff volume in ephemeral watersheds {see Renard <br />and Keppel, 1966 among others) the flow volume is generally greater <br />from the snowmelt event than the thunderstorm events. <br />Surface water is predominantly of the calcium-sulfate type. Total <br />dissolved solids concentrations in the area are quite variable, <br />both spatially and temporally. Dissolved solids concentrations of <br />Red Wash varied between 230 and 1504 milligrams per liter. Data <br />collected during the snowmelt period in April 1979 indicates that a <br />majority of the dissolved solids content of Red Wash originates <br />in the headwaters. <br />• <br />II.D-8 <br />4/81 <br />