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Table AI.1 Monthly Net Evaporation 2013 <br />Sediment Ponds <br />Monthly <br />Fraction of <br />Month Evaporation <br />Jan -13 0.030 <br />Feb -13 0.035 <br />Mar -13 0.055 <br />Apr -13 0.090 <br />May -13 0.120 <br />Jun -13 0.145 <br />Jul-13 0.150 <br />Aug -13 0.135 <br />Sep -13 0.100 <br />Oct -13 0.070 <br />Nov -13 0.040 <br />Dec -13 0.030 <br />totals 1.000 <br />Notes: <br />Jan -May <br />June -Dec <br />Gross Free <br />Surface <br />Evaporation <br />[in] <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />41.000 <br />0.15 acres <br />0.75 acres <br />(1) (2) (3) (4) (5) <br />Monthly <br />Mean Effective Potential <br />Rainfall Precipitation Evaporation <br />[in.] [in.] [in] <br />0.400 0.280 0.000 <br />0.380 0.266 1.169 <br />1.100 0.770 1.485 <br />1.700 1.190 2.500 <br />2.470 1.729 3.191 <br />1.740 1.218 4.727 <br />1.130 0.791 5.359 <br />1.250 0.875 4.660 <br />1.240 0.868 3.232 <br />1.330 0.931 1.939 <br />0.680 0.476 1.164 <br />0.460 0.322 0.000 <br />13.880 9.716 29.426 <br />(6) <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)/12) x (7) <br />( <br />Length of Free Water <br />Dewatering Surface Area <br />Trench [ft] [acre] <br />1400 0.279 <br />1471 0285 <br />1542 0.292 <br />1614 0.298 <br />1685 0.905 <br />1756 0.911 <br />1827 0.918 <br />1898 0.924 <br />1969 0.931 <br />2041 0.937 <br />2112 0.944 <br />2183 0.950 <br />( <br />Net <br />Evaporation <br />[acre -feet] <br />0.000 <br />0.028 <br />0.036 <br />0.062 <br />0.241 <br />0.359 <br />0.410 <br />0.359 <br />0.251 <br />0.151 <br />0.092 <br />0.000 <br />1.988 <br />