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Month <br />(1) - <br />(2) - - <br />( <br />( <br />( <br />( <br />( <br />( <br />( <br />Monthly , , ,, <br />Evaporation' : <br />Distribution "' <br />(%) <br />;' ' Gross <br />'. Evaporation <br />(inches) <br />Average Year <br />Precipitatibn <br />(inches) <br />Effective <br />Precipitation <br />'(inches) <br />Net Unit <br />Evaporation <br />(inches) <br />Net Unit <br />Evaporation <br />(feet) <br />Average <br />Temperature <br />( °F) <br />Net Unit <br />Evaporation <br />(feet) <br />Total <br />Evaporation <br />(acre -feet) <br />October <br />7.0 <br />3.01 <br />1.31 <br />0.92 <br />2.09 <br />0.17 <br />50.31 <br />0.17 <br />1.18 <br />November <br />4.0 <br />1.72 <br />1.19 <br />0.83 <br />0.89 <br />0.07 <br />37.18 <br />0.07 <br />0 50 <br />December <br />3.0 <br />1.29 <br />0.66 <br />0.46 <br />0.83 <br />0.07 <br />27.19 <br />0.00 <br />0.00 <br />January <br />3.0 <br />1.29 <br />0.66 <br />0.46 <br />0.83 <br />0.07 <br />25.72 <br />0.00 <br />0.00 <br />February <br />3.5 <br />1.51 <br />0.64 <br />0.45 <br />1.05 <br />0.09 <br />31.81 <br />0.00 <br />0.00 <br />March <br />5.5 <br />2.37 <br />1.15 <br />0.81 <br />1.56 <br />0.13 <br />39.76 <br />0.13 <br />0.88 <br />April <br />9.0 <br />3.87 <br />1.17 <br />0.82 <br />3.05 <br />0.25 <br />48.16 <br />0.25 <br />1.73 <br />May <br />12.0 <br />5.16 <br />1.26 <br />0.88 <br />4.28 <br />0.36 <br />57.31 <br />0.36 <br />2.42 <br />June <br />14.5 <br />6.24 <br />0.82 <br />0.58 <br />5.66 <br />0.47 <br />66.44 <br />0.47 <br />3.21 <br />July <br />15.0 <br />6.45 <br />• <br />1.49 <br />1.04 <br />5.41 <br />0.45 <br />72.11 <br />0.45 <br />3.06 <br />August <br />13.5 <br />5.81 <br />1.77 <br />1.24 <br />4.57 <br />0.38 <br />69.80 <br />0.38 <br />2.59 <br />September <br />10.0 <br />4.30 <br />1.63 <br />1.14 <br />3.16 <br />0.26 <br />61.80 <br />0.26 <br />1.79 <br />Annual <br />1 100.0 <br />1 43.00 <br />1 13.76 <br />1 9.63 <br />1 33.37 <br />1 2.78 <br />I <br />I 2.55 <br />1 17.37 <br />Table 1 <br />Evaporation Calculation for Site near Colona, Colorado (Elev. 6200 ft) <br />United Companies - Colona Gravel Pit SWSP <br />Groundwater exposed 6.8 acres (based on current measurements) <br />Gross Evaporation 43 inches (from NOAA Technical Report NWS 33) <br />Precipitation Station Montrose 2 <br />Notes: <br />(1) From SEO's Guidelines (2/28/95) for sites with elevation less than 6,500 ft. <br />(2) Annual value from NOAH Technical Report NWS 33. <br />(3) Average annual precipdation data from NOAA recording stations at Montrose 2 (1982 -2006) and Ridgway (1982 -2006) averaged. <br />(4) Equals Column (3) x 0.70 <br />(5) Column (2) - Column (4) <br />(6) Column (5) / 12. <br />(7) Average monthly temperature at the Montrose 2 Climate Station <br />(8) If Column (7) is less than 32 then equals zero, if greater than 32 equals Column (6). <br />(9) Column (8) x number of exposed groundwater surface acres. <br />P \061 - 052 \000 - Colona\swsp\2011 SWSP Renewal\Updated Renewal for Two Year\ Wright Water Engineers, Inc. <br />Updated Tables August 2012 8/7/2012 <br />Des by EKG <br />Ckd by PRF <br />