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Month <br />Percent of <br />Annual <br />Evaporation <br />(A) <br />Gross Lake <br />Evaporation <br />(ft) <br />(B) <br />Precipitation <br />(in) <br />(C) <br />Effective <br />Precipitation <br />(ft) <br />(D) <br />Net Lake <br />Evaporation <br />(ac- ft/ac) <br />(E) <br />Total Lake Evap/ <br />Constumptive Use <br />(ac -ft) <br />(F) <br />Total Lagged <br />Depletions <br />(ac -ft) <br />(G) <br />Nov -11 <br />4% <br />0.15 <br />1.01 <br />0.06 <br />0.09 <br />0.82 <br />1.17 <br />Dec -11 <br />3% <br />0.11 <br />0.84 <br />0.05 <br />0.06 <br />0.57 <br />1.04 <br />Jan -12 <br />3.0% <br />0.11 <br />0.81 <br />0.05 <br />0.07 <br />0.59 <br />0.91 <br />Feb -12 <br />3.5% <br />0.13 <br />0.47 <br />0.03 <br />0.10 <br />0.94 <br />0.82 <br />Mar -12 <br />5.5% <br />0.21 <br />0.44 <br />0.03 <br />0.18 <br />1.63 <br />0.86 <br />Apr -12 <br />9,0% <br />0.34 <br />0.39 <br />0.02 <br />0.31 <br />2.83 <br />1.12 <br />May -12 <br />12.0% <br />0.45 <br />1.17 <br />0.07 <br />0.38 <br />3.44 <br />1.62 <br />Jun -12 <br />14.5% <br />0.54 <br />1.69 <br />0.10 <br />0.45 <br />4.01 <br />2.18 <br />Jul -12 <br />15.0% <br />0.56 <br />2.29 <br />0.13 <br />0.43 <br />3.86 <br />2.72 <br />Aug -12 <br />13.5% <br />0.51 <br />1.64 <br />0.10 <br />0.41 <br />3.69 <br />3.09 <br />Sep-12 <br />10.0% <br />0.38 <br />1.58 <br />0.09 <br />0.28 <br />2.54 <br />3.24 <br />0ct-12 <br />7.0% <br />0.26 <br />1.68 <br />0.10 <br />0.16 <br />1.48 <br />3.04 <br />Total <br />100% <br />3.8 <br />14.0 <br />0.8 <br />2.9 <br />26.4 <br />21.8 <br />Appendix A <br />Lafarge West, Inc. <br />Riverbend West <br />Substitute Water Supply Plan - Evaporative Losses <br />Total Exposed Water Surface = <br />Annual Precipitation = <br />Gross Annual Evaporation = <br />9.0 <br />14.0 <br />45 <br />acres <br />inches - Estimated using the CDSS website's isohyet map <br />inches -Taken from NOAA Technical Report NWS 33 <br />Notes: <br />(A) Taken from General Guidelines for Substitute Water Supply Plans for Sand and Gravel Pits Submitted to The State Engineer <br />(B) Gross lake evaporation = (A) *(Gross Annual Evaporation / 12) <br />(C) Monthly precipitation distribution based on WRCC station in Brighton <br />(D) Effective precipitation = 0.7 *(C)/12 <br />(E) Net lake evaporation from exposed water surfaces = (B) - (D) <br />(F) Total lake evaporation from exposed water surfaces = (E) *Total Exposed Water Surface <br />(G) Total lagged mining depletions which reflect existing steady state conditions <br />pegate <br />