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Table 1 Evaporative Loss - Worthing Pit <br />Month <br />Lake <br />Evaporation <br />Distribution <br />(percent) <br />Gross Lake <br />Evaporation 2 <br />feet <br />Total Average <br />Precipitation 3 <br />inches <br />Effective <br />Precipitation 4 <br />Credit feet <br />Net Lake <br />Evaporation <br />feet <br />Total Exposed <br />Surface Area ° <br />acres <br />Net <br />Evaporative <br />Loss <br />acre -feet <br />January <br />3.0 <br />0.11 <br />0.42 <br />0.02 <br />0.09 <br />4.11 <br />0.36 <br />February <br />3.5 <br />0.13 <br />0.37 <br />0.02 <br />0.11 <br />4.11 <br />0.45 <br />March <br />5.5 <br />0.21 <br />1.14 <br />0.07 <br />0.14 <br />4.11 <br />0.57 <br />April <br />9.0 <br />0.34 <br />1.78 <br />0.10 <br />0.23 <br />4.11 <br />0.96 <br />May <br />12.0 <br />0.45 <br />2.37 <br />0.14 <br />0.31 <br />4.11 <br />1.28 <br />June <br />14.5 <br />0.54 <br />1.64 <br />0.10 <br />0.45 <br />4.11 <br />1.84 <br />July <br />15.0 <br />0.56 <br />1.64 <br />0.10 <br />0.47 <br />4.11 <br />1.92 <br />August <br />13.5 <br />0.51 <br />1.67 <br />0.10 <br />0.41 <br />4.11 <br />1.68 <br />September <br />10.0 <br />0.38 <br />0.95 <br />0.06 <br />0.32 <br />4.11 <br />1.31 <br />October <br />7.0 <br />0.26 <br />0.92 <br />0.05 <br />0.21 <br />4.11 <br />0.86 <br />November <br />4.0 <br />0.15 <br />0.76 <br />0.04 <br />0.11 <br />4.11 <br />0.43 <br />December <br />3.0 <br />0.11 <br />0.51 <br />0.03 <br />0.08 <br />4.11 <br />0.34 <br />Total <br />100.0 <br />3.75 <br />14.17 <br />0.83 <br />2.92 <br />4.11 <br />12.02 <br />Notes: <br />1 From State Engineer (2004) for elevations below 6,500 feet mean sea level. <br />2 Based on average annual evaporation for the area (NOAH 1982). <br />3 Source: Average precipitation Brighton, CO for period of record (1011/1973 to 1/3112012) at wrcc@dri.edu. Accessed 1/31/2012 <br />4 Effective precipitation is 70 percent of total precipitation (credit against evaporation; converted to feet) <br />5 Total surface area of lake at Worthing Pit (4.11 acres) = 32.11 acres minus 28.00 acres of reallocated pre -1981 surface area = 4.11 acres of exposed <br />groundwater. <br />Table 2 Total Depletions - Worthing Pit <br />Month <br />Percent <br />Production <br />Tons <br />Produced' <br />Water by <br />Weight' <br />cubic feet <br />Moisture <br />Loss with <br />Mined <br />Gravel <br />acre -feet <br />Dust <br />Control' <br />acre -feet <br />Net <br />Evaporative <br />Loss 4 <br />acre-feet <br />Total <br />Depletions <br />at Centroid <br />of Pit <br />acre -feet <br />Lagged <br />Depletions ° <br />acre -feet <br />River <br />Depletions <br />acre-feet <br />January <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.36 <br />0.36 <br />0.08 <br />0.30 <br />February <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.06 <br />0.45 <br />0.51 <br />0.07 <br />0.44 <br />March <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.08 <br />0.57 <br />0.65 <br />0.08 <br />0.58 <br />April <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.10 <br />0.96 <br />1.06 <br />0.13 <br />0.92 <br />May <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.11 <br />1.28 <br />1.39 <br />0.16 <br />1.23 <br />June <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.13 <br />1.84 <br />1.97 <br />0.23 <br />1.74 <br />July <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.14 <br />1.92 <br />2.06 <br />020 <br />1.86 <br />August <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.11 <br />1.68 <br />1.79 <br />0.12 <br />1.67 <br />September <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.11 <br />1.31 <br />1.42 <br />0.06 <br />1.37 <br />October <br />0.00 <br />0.00 - <br />0 .00 <br />0.00 <br />0.10 <br />0.86 <br />0.95 <br />-0.01 <br />0.97 <br />November <br />0.00 <br />0.00 - <br />0.00 <br />0.00 <br />0.06 <br />0.43 <br />0.50 <br />-0.07 <br />0.56 <br />December <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.34 <br />0.34 <br />-0.06 <br />0.40 <br />Total <br />u..& -- <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />1.00 <br />12.02 <br />13.02 <br />0.98 <br />12.04 <br />1 No product is being mined at Worthing Pit. <br />2 Calculation assumed 4 percent water loss with mined product; however, no product is being mined at Worthing Pit. <br />3 Calculation assumed 1.0 acre -fleet for dust control. <br />4 From Table 1 far right column <br />