Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. 9.55 5.50 63.43 9.00 01Jan2018 9 a.m. 11.21 5.01 58.36 168.00 01Jan2018 10 a.m. 11.98 7.50 56.11 349.00 01Jan2018 11 a.m. 14.29 6.73 51.59 495.00 01Jan2018 12 p.m. 16.38 6.45 48.78 592.00 01Jan2018 1 p.m. 17.82 3.87 43.66 619.00 01Jan2018 2 p.m. 19.80 4.01 38.34 584.00 01Jan2018 3 p.m. 20.55 4.65 37.85 486.00 01Jan2018 4 p.m. 21.00 5.63 37.25 333.00 01Jan2018 5 p.m. 20.10 5.07 38.22 113.00 01Jan2018 6 p.m. 18.90 1.28 43.04 5.00 01Jan2018 7 p.m. 21.76 0.41 34.49 0.00 01Jan2018 8 p.m. 16.05 0.38 53.36 0.00 01Jan2018 9 p.m. 13.53 0.40 62.95 0.00 01Jan2018 10 p.m. 11.77 0.39 71.99 0.00 01Jan2018 11 p.m. 10.65 0.39 74.85 0.00 02Jan2018 12 a.m. 10.44 0.40 77.72 0.00 02Jan2018 1 a.m. 10.78 0.36 77.59 0.00 02Jan2018 2 a.m. 10.99 0.38 79.92 0.00 02Jan2018 3 a.m. 10.65 0.40 81.81 0.00 02Jan2018 4 a.m. 11.43 0.39 80.53 0.00 02Jan2018 5 a.m. 12.42 0.37 76.01 0.00 02Jan2018 6 a.m. 12.97 0.39 76.37 0.00 02Jan2018 7 a.m. 13.62 0.40 72.16 0.00 Accuml. Values 348.64 60.76 1436.38 3753.00 Num. Valid Values 24 24 24 24 Avg. Values 14.53 2.53 59.85 156.38 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -9.71 97.76 59.85 322.68 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4015 definition: xcompl = 1 - (RELH_avg/100) TdC = -16.0363 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 = 0.2609 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7391 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.7078 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 = 1.1848 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.8167 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.041 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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