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Tab --1 <br />Lake Evaporation <br />'values taken from "Evaporation Atlas for the Contiguous 48 United States," published by the U.S. Dept. of Commerce, June, 1982. Values were <br />derived from monthly pan evaporation for Grand Junction, Colorado 6ESE. <br />2Average monthly values for 1951 through 1980, NOAA. <br />3Based on a procedure developed by the u.s. Bureau of Reclamation: 95% of the first inch + 90% of the second inch + 82 percent of the third inch. <br />4Net evaporation is the difference between gross lake evaporation and effective precipitation. <br />SCombined surface area of the ponds when the water level is at the principle spillway elevation. <br />RN17-05 21-5 Revised 12/17 <br />Gross Lakel <br />Hayden2 <br />Effective3 <br />Neto <br />Pond SurfaceS <br />Calculated <br />Month <br />Evaporation (in.) <br />Precip. (inA <br />Precip. (in. l <br />Evaporation (ft) <br />Area (acres) <br />Evap. (ac-ftl <br />Nov. <br />2.00 <br />1.28 <br />1.20 <br />.067 <br />.87 <br />.058 <br />Dec. <br />1.00 <br />1.60 <br />1.49 <br />0 <br />.87 <br />.000 <br />Jan. <br />0.67 <br />1.54 <br />1.44 <br />0 <br />.87 <br />.000 <br />Feb. <br />1.00 <br />1.18 <br />1.11 <br />0 <br />.87 <br />.000 <br />Mar. <br />2.00 <br />1.19 <br />1.12 <br />.073 <br />.87 <br />.064 <br />Apr. <br />3.33 <br />1.49 <br />1.39 <br />.162 <br />.87 <br />.141 <br />May <br />5.01 <br />1.31 <br />1.23 <br />.315 <br />.87 <br />.274 <br />June <br />6.30 <br />1.20 <br />1.13 <br />.431 <br />.87 <br />.375 <br />July <br />6.48 <br />1.14 <br />1.08 <br />.450 <br />.87 <br />.392 <br />Aug. <br />5.55 <br />1.46 <br />1.36 <br />.349 <br />.87 <br />.304 <br />Sept. <br />4.11 <br />1.15 <br />1.09 <br />.252 <br />.87 <br />.219 <br />Oct. <br />2.55 <br />1-36 <br />1-27 <br />.107 <br />.87 <br />.093 <br />TOTAL <br />40.00 <br />15.90 <br />14.90 <br />2.207 <br />1.920 <br />'values taken from "Evaporation Atlas for the Contiguous 48 United States," published by the U.S. Dept. of Commerce, June, 1982. Values were <br />derived from monthly pan evaporation for Grand Junction, Colorado 6ESE. <br />2Average monthly values for 1951 through 1980, NOAA. <br />3Based on a procedure developed by the u.s. Bureau of Reclamation: 95% of the first inch + 90% of the second inch + 82 percent of the third inch. <br />4Net evaporation is the difference between gross lake evaporation and effective precipitation. <br />SCombined surface area of the ponds when the water level is at the principle spillway elevation. <br />RN17-05 21-5 Revised 12/17 <br />