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Draft West Elk Mine 2005 Armua] Hydrology Report 3 <br />Figure 3. Precipitation Data for McClure Pass <br />The daily snow water equivalent, a standard measure of snow pack, was collected from Snotel data <br />at Overland Reservoir and McClure Pass (MRCS, 2005). Historical data for Overland Reservoir <br />were available beginning with WY 1990 and for McClure Pass beginning in 1981. The annual <br />snow pack (snow water equivalent) was 185% of the historical average for Overland Reservoir and <br />143% for McClure Pass. A summary of the snow pack data is graphically shown in Figures 4 and <br />5. <br />Figure 4. Snow Water Equivalent Data for Overland Reservoir <br />r1 <br />U <br /> Overland Reservoir <br /> Snow Pack <br />r 20 <br />v <br />c <br />m ~Aeerage Monthly <br /> SWE <br />'~ 10 - - - WYs 1990-2004 <br />o~ <br />W <br />r, <br />5 ~--Average Monthly <br /> <br />3 -- - <br />SWE <br />3 WY 2005 <br />° 0 <br />c <br />w ~o~mc die` ~~ JaA oa`~ ~~~r PQC\ ~aq )°c~ <br />c <br />. <br />cp 5~~~ A~y'v ~~ <br />~` <br /> )mac 6.o <br />~ <br />Oo ore & <br />~1 Q0 ~( PJ ~~ <br />Q,Q <br /> y <br />September 2006 <br />HydroGeo, Inc. <br />