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r r r r r r U__ r r r--- r rr_ r r r r - r r - EVAPORATION TABLE FOR THE WESTERN STATES Standard daily pan evaporation is measured using the four-foot diameter Class A evaporation pan. The pan water level reading is adjusted when precipitation is measured to obtain the actual evaporation. Most Class A pans are installed above ground, allowing effects such as radiation on the side walls and heat exchanges with the pan material. These effects tend to increase the evaporation totals. The amounts can then beadjustedby multiplying the totals by 0.70 or 0.80 to more closely estimate the evaporation from naturally existing surfaces such as a shallow lake, wet soil or other moist natural surfaces. Many stations do not measure pan evaportation during winter months. A 110.00" total indicates no measurement is taken. MONTHLY AVERAGE PAN EVAPORATION (INCHES) I PERIOD I I OF RECORD I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR CALIFORNIA AUBURN DAM PROJECT 11972-1984 1 1.42 1.89 3.13 4.89 7.73 10.08 11.66 10.70 8.08 5.00 1.97 1.36 67.91 BEAUMONT PUMPING PLANT 11948-1975 1 2.90 3.29 4.08 5.03 6.40 8.15 10.64 9.97 7.90 5.87 3.22 2.90 70.35 BERRYESSA LAKE 11957-1970 1 1.53 2.15 3.79 5.82 8.90 11.00 13.22 12.06 8.67 5.72 2.48 1.66 77.00 BOCA 1948-2000 1 0.00 0.00 0.00 0.00 6.83 8.52 10.00 9.09 6.49 4.32 0.00 0.00 45.25 BRANNAN ISLAND 11968-1977 1 1.15 1.74 4.36 7.03 10.49 12.39 13.51 12.02 9.03 4.80 1.83 1.08 79.43 BURLINGAME 11948-1978 1 1.27 1.81 3.60 5.28 6.85 7.82 8.42 7.39 5.74 3.78 1.98 1.28 55.22 BUTLER VALLEY RANCH 11970-1975 1 0.42 0.63 1.44 2.87 4.54 5.38 7.00 6.18 4.12 1.58 0.56 0.46 35.18 CACHUMA LAKE 11952-2000 1 2.47 3.62 4.42 6.02 7.52 8.54 9.52 9.01 7.01 5.48 3.55 2.51 69.67 CHICO EXPERIMENT STN 11906-2000 1 1.24 2.13 3.81 5.62 8.24 10.11 11.48 9.71 7.36 4.46 2.10 1.30 67.56 DAVIS 1 WSW 11917-2000 1 1.47 2.34 4.49 7.10 10.08 12.14 12.76 11.25 9.06 6.32 2.89 1.45 81.35 DEATH VALLEY 11961-2000 1 3.98 5.44 9.19 13.06 16.81 19.24 21.12 18.98 14.12 9.89 5.56 3.78 141.17 DUTTONS LANDING 11955-1977 1 1.42 2.09 3.87 5.70 7.74 9.34 9.34 8.27 6.75 4.65 2.25 1.46 62.88 FERNDALE 2 NW 1963-1973 1 0.70 1.17 2.26 3.21 3.95 4.38 4.49 4.07 3.59 2.06 1.04 0.72 31.64 FOLSOM DAM 11955-1993 1 0.92 1.90 3.47 5.21 8.07 9.91 11.12 9.93 7.45 4.89 2.06 1.25 66.18 FRIANT GOVERNMENT CAMP 1 1948-2000 1 1.44 2.12 3.78 5.88 9.37 12.04 13.99 12.50 8.98 5.76 2.61 1.36 79.83 GRIZZLY ISLAND REFUGE 1 1971-1977 1 1.45 2.25 4.00 5.72 8.07 9.82 10.69 8.93 6.88 4.33 2.10 1.55 65.79 INDIO U S DATE GARDEN 11927-2000 1 2.85 4.38 7.15 9.98 12.73 14.85 14.95 13.59 10.80 7.60 3.98 2.49 105.35 KETTLEMAN CITY 1 SSW 11955-1975 1 1.73 2.99 5.80 8.32 11.75 14.27 16.11 14.74 10.82 7.30 3.46 1.74 99.03 KNIGHTS FERRY 2 ESE 11959-1977 1 1.00 1.69 3.14 5.65 8.54 10.14 11.60 10.31 7.74 4.62 2.69 1.00 68.12 KNIGHTS VALLEY 11964-1969 1 0.81 2.35 2.61 2.75 5.35 0.00 6.68 7.62 4.82 4.23 2.15 1.61 40.98 LAKE PILLSBURY 2 11964-1970 1 0.58 1.42 3.01 4.62 7.41 8.38 10.31 9.35 6.93 3.61 1.19 0.87 57.68 LAKE SOLANO 11975-2000 1 1.50 2.42 4.25 6.68 9.19 11.27 11.65 9.91 7.60 5.30 2.62 1.69 74.08 LAKE SPAULDING DAM 11955-1971 1 0.00 0.00 0.00 0.00 7.20 9.98 12.38 11.85 8.94 6.64 0.00 0.00 56.99