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Water Yield <br />• <br />Runoff data suggests that the amount of water available along North Thompson <br />Creek is relatively low. The annual runoff of 16.2 cubic feet per second (cfs) <br />is about 0.6 cfs per square mile. Eightly percent of this runoff occurs during <br />the snowmelt season of April through June. The remainder of the year is <br />normally quite dry, except for random thunderstorm events (from data presented <br />in Section 3.6.1.2), however, North Thompson Creek is a perennial stream. <br />Soils <br /> <br />Mapping (at a scale of 1:6000) of the soils in the mine area failed to identify <br />mapable soils along North Thompson Creek (Drawing Number D-3-14 [mine area soils <br />map]). The soils that do occur, are thin and patchy, and subject to removal by <br />high creek levels. <br />• Subirrigation <br />A reconnaissance study of vegetation failed to identify areas of subirrigation <br />in the nonalluvial areas. In the alluvial areas much of the stream bottom is <br />tree covered with the typically associated shrubs and grasses. Most likely, <br />this vegetation receives water from the stream through the coarse sediments, but <br />there are no large expanses of subirrigated land which could he cultivated. <br />MIDDLE THOMPSON CREEK <br />Unconsolidated Sediments <br />Unconsolidated sediments along Middle Thompson Creek consist of thin, intermit- <br />tent alluvium as described in the introduction. The alluvium varies in width <br />from 50 feet in the upper reaches of the stream to 650 feet in the area of <br />n <br />~J <br />5-6 <br />