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Table 2 <br />Martin Marietta Materials Rich Pit <br />Unused Wash Pond Depletions <br />Month <br />Percent of <br />Annual <br />Evaporation <br />( %) <br />Grass <br />Evaporation Rate <br />(ft) <br />2 <br />Exposed <br />Surface Area <br />(ac) <br />[3 ] <br />Gross <br />Evaporation <br />(ac-ft) <br />[3 <br />Average <br />Precipitation <br />(ft) <br />4 <br />Effective <br />Precipitation <br />(ft) <br />5 <br />Net <br />Evaporation <br />Rate <br />(ft) <br />6 ] <br />Net <br />Evaporation <br />Depletions <br />(ac -ft) <br />[71 <br />Lagged <br />Depletions <br />(ac-ft) <br />181 <br />Apr -l4 <br />9.0% <br />0.38 <br />0.5 <br />0.19 <br />0.10 <br />0.07 <br />0.30 <br />0.15 <br />O.11 <br />May -14 <br />12.0% <br />0.50 <br />0.5 <br />0.25 <br />0.12 <br />0.09 <br />0.41 <br />0.21 <br />0.12 <br />Jun -14 <br />14.5% <br />0.60 <br />0.5 <br />0.30 <br />0.11 <br />0.08 <br />0.52 <br />0.26 <br />0.14 <br />Jul -14 <br />15.0% <br />0.63 <br />0.5 <br />0.31 <br />0.16 <br />0.11 <br />0.51 <br />0.26 <br />0.16 <br />Aug -14 <br />13.5% <br />0.56 <br />0.5 <br />0.28 <br />0.17 <br />0.12 <br />0.44 <br />012 <br />0.17 <br />Sep -14 <br />10.0% <br />0.42 <br />0.5 <br />0.21 <br />0.07 <br />0.05 <br />0.37 <br />0.19 <br />0.18 <br />Oct -14 <br />7.0% <br />0.29 <br />0.5 <br />0.15 <br />0.06 <br />0.04 <br />0.25 <br />0.13 <br />0.17 <br />Nov -14 <br />4.0% <br />0.17 <br />0.5 <br />0.08 <br />0.04 <br />0 03 <br />0.14 <br />0.07 <br />0 15 <br />Dec -14 <br />3.0% <br />0.13 <br />0.5 <br />0,06 <br />0.03 <br />0.02 <br />011 <br />0.06 <br />0.13 <br />Jan -15 <br />3.0% <br />0.13 <br />0.5 <br />0.06 <br />0.03 <br />0.02 <br />0.11 <br />0.06 <br />0.12 <br />Feb -15 <br />3.5% <br />0.15 <br />0.5 <br />0.07 <br />0.03 <br />0.02 <br />013 <br />0.07 <br />0.11 <br />Mar -15 <br />5.5% <br />0.23 <br />0.5 <br />0.11 <br />0.07 <br />0.05 <br />0.18 <br />0.09 <br />0.11 <br />Total <br />100% <br />4.17 <br />- <br />2.08 <br />1.00 <br />0.70 <br />3.47 <br />1.74 <br />1.67 <br />Notes' <br />[ I ] Monthly percentages determined to SB89 -120 for elevations below 6,500 feet. <br />[2] Based upon NOAH Technical Report NWS 33, Evaporation Atlas for the Contiguous 48 United States. <br />[3] Total exposed surface area based on review of aerial photography. <br />[4] Gross evaporation = [2] x [3]. <br />[5] Based upon the Western Regional Climate Center Station for Pueblo, CO (056740) for the time period 1954 -2005. <br />[6] Effective precipitation = [5] x 0.7. <br />[7] Net evaporation rate = [2] - [6]. <br />[8] Net evaporation depletions = [7] x [3]. <br />[9] Reflects real time lagged depletions due to evaporation based on Glover analysis using a stream depletion factor of 120 days. <br />ii' <br />