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Ll <br />in combination with large diurnal temperature fluctuations, kept stilling wells <br />frozen during spring runoff periods. Runoff was measured in the rated section on <br />Johnson Gulch, because of higher flow rates (due to a larger drainage area) and <br />the ability to manually thaw the apparatus. Thus, information from Johnson Gulch <br />is considered the best site-specific information on the timing of yields from the <br />mine -plan area. <br />Figure 2.7-15 shows cumulative discharges from the Johnson Gulch watershed from <br />March to December, 1975. It should be noted that station S-4 is below the con- <br />fluence of Johnson and Pyeatt Gulches. The majority of runoff occurred in the <br />spring with over half the yield occurring in April. This corresponds to the <br />regional distributions of flows with peak flows in the spring. <br />2-413 <br />