Detailed Weather Data for Project: ALTU

Date Time TAIR WSPD RELH SRAD 30Dec2017 8 a.m. 22.42 16.11 91.50 0.75 30Dec2017 9 a.m. 21.26 16.18 91.67 10.00 30Dec2017 10 a.m. 20.57 17.00 90.75 36.75 30Dec2017 11 a.m. 20.54 18.04 87.67 81.67 30Dec2017 12 p.m. 20.71 18.45 84.50 121.75 30Dec2017 1 p.m. 20.90 16.85 80.33 140.00 30Dec2017 2 p.m. 22.01 14.82 76.50 152.50 30Dec2017 3 p.m. 21.70 12.02 75.25 106.50 30Dec2017 4 p.m. 21.83 11.63 73.75 84.50 30Dec2017 5 p.m. 21.92 11.58 72.50 54.00 30Dec2017 6 p.m. 20.84 8.72 74.00 0.00 30Dec2017 7 p.m. 20.12 7.16 78.00 0.00 30Dec2017 8 p.m. 19.67 7.72 82.00 0.00 30Dec2017 9 p.m. 19.10 6.49 87.33 0.00 30Dec2017 10 p.m. 18.32 7.33 91.50 0.00 30Dec2017 11 p.m. 18.28 6.10 93.50 0.00 31Dec2017 12 a.m. 18.28 7.61 94.00 0.00 31Dec2017 1 a.m. 18.37 10.68 93.75 0.00 31Dec2017 2 a.m. 18.46 13.09 93.00 0.00 31Dec2017 3 a.m. 18.38 13.94 92.00 0.00 31Dec2017 4 a.m. 18.23 14.88 89.25 0.00 31Dec2017 5 a.m. 18.50 14.65 88.50 0.00 31Dec2017 6 a.m. 17.96 16.78 89.50 0.00 31Dec2017 7 a.m. 15.80 16.11 85.50 0.00 Accuml. Values 474.17 303.94 2056.25 788.42 Num. Valid Values 24 24 24 24 Avg. Values 19.76 12.66 85.68 32.85 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -6.80 489.04 85.68 67.79 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1432 definition: xcompl = 1 - (RELH_avg/100) TdC = -8.8179 definition: TdC = TAIR_avg - ((14.55 + (0.114*TAIR_avg))*xcompl +pow((2.5 + 0.007*TAIR_avg)*xcompl, 3) + (15.9 +0.117*TAIR_avg)*pow(xcompl, 14)) del_lambda1 = 0.3015 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.6985 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.4885 definition: Qn = 0.00714*SRAD_avg + 0.00000526*SRAD_avg*pow(TAIR_avg+17.8, 1.87) +0.00000394*pow(SRAD_avg, 2) - 0.00000000239*pow(SRAD_avg, 2)*pow(TAIR_avg-7.2, 2) - 1.02 es_ea = 0.5362 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.0622 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.023 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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