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West Elk Mine 2013 Annual Hydrology Report 4 <br />Figure 3. Monthly Precipitation Data for Overland Reservoir (59853) <br />Overland Reservoir <br />5 <br />4 <br />0 <br />c <br />'u 2 <br />L <br />a <br />1 <br />0 <br />Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep <br />-Average Monthly Precipitation WY 1991 -2012 -Total Monthly Precipitation WY 2013 <br />Adapted from NRCS (2014b) <br />The SWE was derived from SNOTEL data recorded at Overland Reservoir and McClure <br />Pass stations (MRCS, 2014c). Historical SWE data for Overland Reservoir are available <br />beginning in WY 1990 and for McClure Pass beginning in WY 1981. A summary of the <br />average monthly SWE data is graphically shown in Figures 4 and 5. In WY 2013, the <br />annual average SWE at Overland Reservoir was 2.8 inches and 3.9 inches at McClure <br />Pass, compared to the historical annual SWE averages of 4.1 inches at Overland <br />Reservoir (WY 1990 -WY 2012) and 5.4 inches at McClure Pass (WY 1981 -WY 2012). <br />These SWE values correspond to 67% of the historical annual average SWE for Overland <br />Reservoir and 71 % for McClure Pass. <br />June 2014 HydroGeo, Inc. <br />