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<br />Grand Junction Pipe & Supoly Co. <br />Table 1: Monthly Net Evaporation <br />Gunnison River Pits <br /> <br />Month Monthly <br />Distribution <br />(%) <br />1 Gross Lake <br />Evaporation <br />(inches) <br />2 <br />Precipitation <br />(inches) <br />3 Effective <br />Precipitation <br />(inches) <br />4 Net Lake <br />Evaporation <br />(inches) <br />5 Net Lake <br />Evaporation <br />(ac-ft/ac) <br />6 <br />January 0.030 1.65 0.48 0.34 0.00 0.00 <br />February 0.035 1.93 0.46 0.32 1.61 0.13 <br />March 0.055 3.03 0.85 0.60 2.43 0.20 <br />April 0.090 4.95 0.84 0.59 4.36 0.36 <br />May 0.120 6.60 0.95 0.67 5.93 0.49 <br />June 0.145 7.98 0.51 0.36 7.62 0.64 <br />July 0.150 8.25 . 072 0.50 7.75 0.65 <br />August 0.135 7.43 0.82 0.57 6.86 0.57 <br />September 0.100 5.50 0.96 0.67 4.83 0.40 <br />October 0.070 3.85 0.95 0.67 3.18 0.27 <br />November 0.040 2.20 0.74 0.52 1.68 0.14 <br />December 0.030 1.65 0.58 0.41 0.00 0.00 <br />Annual Total 1.000 55.02 8.86 622 46.25 3.85 <br />(1) From General Guidelines for Substitute Water Supply Plans for Sand & Gravel Pits <br />Submitted to the State Engineer Pursuant to SB 89-120 & SB 93-260 (updated September 30, 2009) <br />(2) Calculated as annual evaporation (55 inches) from NOAA Technical Report 33 x monthly distribution <br />(3) Monthly precipitation data for Grand Junction 6 ESE, Colorado station averaged for the years 1962 - 2009 <br />(4) Precipitation x 0.70 (General Guidelines for Substitute Water Supply Plans for Sand & <br />Gravel Pits Submitted to the State Engineer Pursuant to SB 89-120 & SB 93-260 [updated September 30, 2009) <br />(5) Gross lake evaporation minus effective precipitation; evaporation occurs when historical mean monthly temperature is <br />greater than 320 F. based on Colorado Climate Center historical mean monthly temperature records for Grand Junction <br />6 ESE, Colorado station for period of 1962 - 2009 <br />(6) Conversion to ac-ft/ac <br />Western Water & Land, Inc.