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Table AI.2 Monthly Net Evaporation 2014 <br />Sediment Ponds 0.75 acres <br />( ( <br />Gross Free <br />Monthly Surface <br />Fraction of Evaporation <br />Month Evaporation [in] <br />Jan -14 0.030 41.000 <br />Feb -14 0.035 41.000 <br />Mar -14 0.055 41.000 <br />Apr -14 0.090 41.000 <br />May -14 0.120 41.000 <br />Jun -14 0.145 41.000 <br />Jul-14 0.150 41.000 <br />Aug -14 0.135 41.000 <br />Sep-14 0.100 41.000 <br />Oct -14 0.070 41.000 <br />Nov -14 0.040 41.000 <br />Dec -14 0.030 41.000 <br />totals 1.000 <br />Notes: <br />(3) (4) (5) <br />Mean <br />Rainfall <br />[in.] <br />0.400 <br />0.380 <br />1.100 <br />1.700 <br />2.470 <br />1.740 <br />1.130 <br />1.250 <br />1.240 <br />1.330 <br />0.680 <br />0.460 <br />Monthly <br />Effective Potential <br />Precipitation Evaporation <br />[in.] [in] <br />0.280 0.000 <br />0.266 1.169 <br />0.770 1.485 <br />1.190 2.500 <br />1.729 3.191 <br />1.218 4.727 <br />0.791 5.359 <br />0.875 4.660 <br />0.868 3.232 <br />0.931 1.939 <br />0.476 1.164 <br />0.322 0.000 <br />13.880 9.716 29.426 <br />(6) <br />Length of <br />Dewatering <br />Trench [ft] <br />2365 <br />2547 <br />2729 <br />2911 <br />3093 <br />3275 <br />3456 <br />3638 <br />3820 <br />4002 <br />4184 <br />4366 <br />(1) = Monthly fraction of evaporation for elevations below 6500 ft from Guidelines <br />for Substitute Water Supply Plans. <br />(2) = Gross free water surface evaporation from NOAA Technical Report NWS 33 <br />(3) = Mean Rainfall - See AI.6 <br />(4) = Effective Rainfall = 70% Mean Rainfall <br />(5) = Columns (1) x (2) - (4) <br />(6) = Predicted Length of Dewatering Trench <br />(7) = Total free water surface area <br />(8) = Columns ((5)112) x (7) <br />( <br />Free Water <br />Surface Area <br />[acre] <br />0.967 <br />0.984 <br />1.001 <br />1.017 <br />1.034 <br />1.051 <br />1.067 <br />1.084 <br />1.101 <br />1.118 <br />1.134 <br />1.151 <br />(8) <br />Net <br />Evaporation <br />[acre -feet] <br />0.000 <br />0.096 <br />0.124 <br />0.212 <br />0.275 <br />0.414 <br />0.477 <br />0.421 <br />0.296 <br />0.181 <br />0.110 <br />0.000 <br />2.605 <br />