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West Elk Mine 2014 Annual Hydrology Report <br />Fieure 3. Monthly Precipitation for Overland Reservoir (59853) <br />Overland Reservoir <br />5 <br />,-. 4 <br />- <br />r <br />3 <br />-------- - <br />0 <br />o. <br />u 2 <br />L <br />G, <br />1 <br />0 <br />Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep <br />—� Average Monthly Precipitation WY 1990-2013 – 0 Total Monthly Precipitation WY 2014 <br />Adapted from NRCS (2015b) <br />The SWE was derived from SNOTEL data recorded at the Overland Reservoir and <br />McClure Pass stations (MRCS, 2015c, 2015d). Historical SWE data for Overland <br />Reservoir are available beginning in WY 1990 and for McClure Pass beginning in WY <br />1981. A summary of the average monthly SWE data is graphically shown in Figures 4 <br />and 5. In WY 2014, the annual average SWE was 3.5 inches at Overland Reservoir and <br />5.2 inches at McClure Pass, compared to the historical annual SWE averages of 4.1 <br />inches at Overland Reservoir (WY 1990 through WY 2013) and 5.4 inches at McClure <br />Pass (WY 1981 through WY 2013). These SWE values correspond to 85 percent of the <br />historical annual average SWE for Overland Reservoir and 96 percent for McClure Pass. <br />June 2015 HydroGeo, Inc. <br />