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Table 1 <br />City of Fort Collins <br />East Rigden Pit SWSP <br />Evaporative Losses <br />Applegate <br />Group, <br />Month <br />Percent of <br />Annual <br />Evaporation <br />(A) <br />Gross Lake <br />Evaportation <br />(ft) <br />(B) <br />Precipitation <br />(in) <br />(C) <br />Effective <br />Precipitation <br />(ft) <br />(D) <br />Net Lake <br />Evaporation <br />(acre- ft/acre) <br />(E) <br />Total Lake <br />Evaporation <br />(ac -ft) <br />(F) <br />Mar -14 <br />5.5% <br />0.18 <br />0.87 <br />0.05 <br />0.13 <br />0.38 <br />Apr-14 <br />9.0% <br />0.29 <br />1.45 <br />0.08 <br />0.21 <br />0.62 <br />May-14 <br />12.0% <br />0.39 <br />2.37 <br />0.14 <br />0.25 <br />0.76 <br />Jun -14 <br />14.5% <br />0.47 <br />1.96 <br />1 0.11 <br />0.36 <br />1.07 <br />Jul -14 <br />15.0% <br />0.49 <br />1.37 <br />0.08 <br />0.41 <br />1.22 <br />Aug-14 <br />13.5% <br />0.44 <br />1.10 <br />0.06 <br />0.37 <br />1.12 <br />Se 14 <br />10.0% <br />0.33 <br />0.96 <br />0.06 <br />0.27 <br />0.81 <br />Oct -14 <br />7.0% <br />0.23 <br />0.97 <br />0.06 <br />0.17 <br />0.51 <br />Nov -14 <br />4.0% <br />0.13 <br />0.52 <br />0.03 <br />0.10 <br />0.30 <br />Dec -14 <br />3.0% <br />0.10 <br />1 0.35 <br />0.02 <br />0.00 <br />0.00 <br />Jan -15 <br />3.0% <br />0.10 <br />0.34 <br />0.02 <br />0.00 <br />0.00 <br />Feb-15 <br />3.5% <br />0.11 <br />0.28 <br />0.02 <br />0.00 <br />0.00 <br />INUMM <br />MEMO= <br />5 <br />Total Exposed Surface Area = 28.1 acres <br />Pre -1981 Area = 25.1 acres <br />Exposed Surface Area = 3.0 acres <br />Annual Preciptiation = 12.5 inches - Taken from the Windsor Weather Station <br />Gross Annual Evaporation = 39 inches -Taken from NOAA Technical Report NWS 33 <br />(A) Taken from General Guidelines for Substitute Wafer Supply Plans for Sand and Gravel Pits Submitted to The State Engineer <br />(B) Gross lake evaporation = (A) *(Gross Annual Evaporation / 12) <br />(C) Mean monthly precipitation values. <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 />Operational Losses Lagged Depletions <br />Month <br />Water Used <br />for Liner and <br />Embank. Const. <br />(ac -ft) <br />(G) <br />Water Used <br />for Dust Control <br />& Rec. Irrig. <br />(ac -ft) <br />(H) <br />Operational <br />Consumptive <br />Use <br />(ac -ft) <br />(I) <br />Mar -14 <br />12.28 <br />0.77 <br />13.04 <br />Apr-14 <br />24.55 <br />1.53 <br />26.09 <br />May-14 <br />1 24.55 <br />1.53 <br />26.09 <br />Jun -14 <br />24.55 <br />1.53 <br />26.09 <br />Jul -14 <br />24.55 <br />1.53 <br />26.09 <br />Aug-14 <br />24.55 <br />1.53 <br />26.09 <br />Se 14 <br />24.55 <br />1.53 <br />26.09 <br />Oct -14 <br />24.55 <br />1.53 <br />26.09 <br />Nov -14 <br />24.55 <br />1.53 <br />26.09 <br />Dec -14 <br />12.28 <br />0.77 <br />13.04 <br />Jan -15 <br />1 0.00 <br />0.00 <br />0.00 <br />Feb-15 <br />1 0.00 <br />0.00 <br />0.00 <br />Total <br />Consumptive <br />Use <br />(ac -ft) <br />(3) <br />Total <br />Lagged <br />Depletions <br />(ac -ft) <br />(K) <br />13.43 <br />2.28 <br />26.71 <br />5.45 <br />26.84 <br />9.53 <br />27.16 <br />12.20 <br />27.31 <br />14.03 <br />27.21 <br />15.39 <br />26.89 <br />16.45 <br />26.60 <br />17.29 <br />26.38 <br />17.99 <br />13.04 <br />17.83 <br />0.00 <br />15.13 <br />0.00 <br />11.55 <br />1. <br />Notes: <br />(G) Approximately 8 million gallons per month during construction <br />(H) Approximately 500,000 gallons per month during construction <br />(I) _ (G) + (H) <br />(J) _ (F) + (I) <br />(K) Total lagged mining depletions do not reflect steady state conditions and are displayed as "real -time" depletions <br />N:\14 Ft Co Il Ea Rgd.n PR SWSPDl iplines(TehnicaD) PM\WHr RlghftQO14 SWSP1Tablez . <br />