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West Elk Mine 2004 Annual Hydrology Report 3 <br />• Figure lc: Precipitation Data for McClure Pass. <br />McClure Pass <br />6 <br />H 5 <br />d <br />r <br />4 <br />c <br />t W Y 2004 <br />0 3 <br />Y_ <br />.~ <br />°' 2 -~-Average <br />1971-2000 <br />a 1 <br />0 <br />Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep <br />The daily snow water equivalent, a standard measure of snow pack, was collected from Snotel data <br />at Overland Reservoir and McClure Pass. Historical data for Overland Reservoir was available <br />beginning with WY 1990, and for McClure Pass beginning in 1981. In WY 2004 the annual snow <br />• pack (snow water equivalent) was 110% of the historical average (WY 1990 -WY 2003) for <br />Overland Reservoir and 76%o for McClure Pass. A summary of the snow pack data is graphically <br />shown in Figures 2a and b. <br /> <br />Figure 2a. Snow Water Equivalent Data for Overland Reservoir. <br />Overland Reservoir <br />Snow Padc <br />t 20 <br />0 <br />c <br />d 15 +-Average Monthl <br />~ SWE <br />'~ 10 WYs 1990-2003 <br />W <br />~ 5 ~ Average Monthl <br />~ __ _ <br />~ SWE <br />W Y 2004 <br />o p <br />c <br />to wo~~ ~~ ~~ Jai `~~ for PQC\ ~a~ ~JCO ~J~~ AJy'~ ~,~,~ <br />cF ~,o ~~ ~'~ ~0~ ~ P° ~~m <br />5 <br />August 2005 HydroGeo, Inc. <br />