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Section 12 <br />Climate <br />• 12.4 Evaporation Rates <br />Pan evaporation data are not available at the Uravan station. Therefore, pan <br />evaporation data were collected from a monitoring station at Dead Horse Creek near <br />Naturita, Colorado. The period of record for these data extends from 1971 to 1980. <br />Table 12-4 shows the pan evaporation data from the monitoring station at Dead Horse <br />Creek near Naturita, Colorado. Figure 12-4 illustrates the relationship between <br />average monthly precipitation measured in Uravan and average monthly pan <br />evaporation from the Dead Horse Creek monitoring station data. This figure shows <br />that monthly pan evaporation is greater than monthly precipitation from April <br />through October. During the late fall to early spring months (November through <br />March), pan evaporation is not measured due to regular freezing temperatures at <br />night and daily thaw. Actual evaporation is likely to be less than pan evaporation due <br />to affects such as available soil moisture, infiltration into the subsurface, variations in <br />surface topography, and differences related to the effect of the evaporation pan on <br />measured evaporation rates. Pan evaporation exceeds precipitation by approximately <br />4 times based on the available data. <br /> <br />12-2 <br />T:\64986-Denison Mines\Task Order 4 - EPP Sunday Mines Group-Van4\Van4\FINAL Report\FINAL - Environmental Protection Plan Van4.doc