Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 30Dec2017 8 a.m. 38.57 0.17 68.74 2.00 30Dec2017 9 a.m. 39.00 0.40 69.60 16.00 30Dec2017 10 a.m. 39.24 2.29 65.39 38.00 30Dec2017 11 a.m. 37.47 5.44 64.35 44.00 30Dec2017 12 p.m. 35.49 7.78 66.67 50.00 30Dec2017 1 p.m. 34.72 7.36 73.02 63.00 30Dec2017 2 p.m. 33.19 6.74 77.41 49.00 30Dec2017 3 p.m. 32.20 7.12 74.97 43.00 30Dec2017 4 p.m. 32.20 5.34 71.86 30.00 30Dec2017 5 p.m. 31.87 4.15 73.64 10.00 30Dec2017 6 p.m. 31.21 5.09 66.18 1.00 30Dec2017 7 p.m. 21.11 6.61 35.35 0.00 30Dec2017 8 p.m. 29.79 1.78 70.70 0.00 30Dec2017 9 p.m. 28.80 4.60 76.20 0.00 30Dec2017 10 p.m. 28.24 4.09 83.03 0.00 30Dec2017 11 p.m. 28.02 0.39 91.22 0.00 31Dec2017 12 a.m. 28.24 0.61 90.11 0.00 31Dec2017 1 a.m. 27.70 2.68 94.20 0.00 31Dec2017 2 a.m. 27.25 2.41 96.52 0.00 31Dec2017 3 a.m. 27.59 3.02 96.28 0.00 31Dec2017 4 a.m. 27.81 4.34 96.29 0.00 31Dec2017 5 a.m. 26.92 5.55 96.03 0.00 31Dec2017 6 a.m. 26.92 5.38 95.12 0.00 31Dec2017 7 a.m. 25.16 5.04 90.54 1.00 Accuml. Values 738.70 98.38 1883.42 347.00 Num. Valid Values 24 24 24 24 Avg. Values 30.78 4.10 78.48 14.46 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -0.68 158.29 78.48 29.84 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2152 definition: xcompl = 1 - (RELH_avg/100) TdC = -3.9484 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 = 0.3931 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.6069 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.7718 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 = 1.2589 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.0764 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.014 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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