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Month <br />Percent of <br />Annual <br />Evaporation <br />Gross <br />Evaporation <br />(inches) <br />Average <br />Precipitation <br />(inches) <br />Effective <br />Precipitation <br />(inches) <br />Net <br />Evaporation <br />(inches) <br />(feet) <br />Site <br />Evaporation <br />2.00 ac <br />(ac -ft) <br />Lagged Site <br />Evaporation <br />(ac -ft) <br />January <br />3.0% <br />1.32 <br />0 43 <br />0.30 <br />1.02 <br />0.08 <br />017 <br />0.37 <br />February <br />3 5% <br />1.54 <br />0.38 <br />0.27 <br />1.27 <br />011 <br />0.21 <br />0.32 <br />March <br />5.5% <br />2.42 <br />1.04 <br />0.73 <br />1.69 <br />0.14 <br />0 28 <br />0.35 <br />April <br />9 0% <br />3.96 <br />1.43 <br />1.00 <br />2 96 <br />0.25 <br />0.49 <br />0.36 <br />May <br />12.0% <br />5.28 <br />2.11 <br />1.48 <br />3.80 <br />0.32 <br />0.63 <br />0 44 <br />June <br />14.5% <br />6.38 <br />1.62 <br />1.14 <br />5.24 <br />0.44 <br />0.87 <br />0 51 <br />July <br />15.0% <br />6.60 <br />1.42 <br />1.00 <br />5.60 <br />0.47 <br />0 93 <br />0.62 <br />August <br />13 5% <br />5.94 <br />1.38 <br />0 96 <br />4.98 <br />0 41 <br />0.83 <br />0.66 <br />September <br />10.0% <br />4.40 <br />1.17 <br />0.82 <br />3.58 <br />0.30 <br />0 60 <br />0 63 <br />October <br />7.0% <br />3.08 <br />0 82 <br />0.58 <br />2 50 <br />0 21 <br />0.42 <br />0.59 <br />November <br />4.0% <br />1.76 <br />0 70 <br />0.49 <br />1.27 <br />0 11 <br />0.21 <br />0.49 <br />December <br />3.0% <br />1.32 <br />0.41 <br />0.29 <br />1.03 <br />0.09 <br />0.17 <br />0 43 <br />Total <br />100% <br />44.00 <br />12.93 <br />9.05 <br />34.95 <br />2.91 <br />5.82 <br />5.77 <br />(1) <br />(2) <br />(3) <br />Table 1 <br />Heit Sand & Gravel Mine <br />Evaporative Losses <br />(4) <br />(1) Based on SB 120 for gravel pits at elevations below 6,500 feet, readjusted for ice -cover months <br />(2) Percent of Annual Evaporation times 44 0 inches <br />(3) From Western Regional Climate Center, (http Hwww wrcc do edu/) <br />(4) Equals Column (3) times 70% <br />(5) Equals Column (2) minus Column (4) <br />(6) Equals Column (5) divided by 12 inches <br />(7) Equals the monthly values in Column (6) times 2 0 acres <br />(8) Based on SE0 Glover calculations D =2750 ft, T= 140,000 gpd/ft & S =0 2, No Flow = 10,000 if <br />(9) Equals the sum of Column (7) times the monthly values in Column (8) <br />(5) <br />(6) <br />(7) <br />DEC 12 ZU11 <br />WATER RESOURCES <br />STATE ENGINEER <br />r O <br />(8) <br />