Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 06Mar2018 8 a.m. 38.77 3.10 54.42 94.70 06Mar2018 9 a.m. 43.93 9.80 36.74 343.00 06Mar2018 10 a.m. 47.53 16.30 28.37 558.40 06Mar2018 11 a.m. 50.11 17.60 23.72 730.50 06Mar2018 12 p.m. 51.98 19.50 21.03 841.50 06Mar2018 1 p.m. 53.42 22.10 18.97 889.70 06Mar2018 2 p.m. 54.41 21.60 18.21 860.80 06Mar2018 3 p.m. 55.80 23.00 16.41 726.80 06Mar2018 4 p.m. 55.63 22.80 17.34 520.50 06Mar2018 5 p.m. 54.82 21.10 18.14 309.30 06Mar2018 6 p.m. 53.33 18.90 20.09 88.50 06Mar2018 7 p.m. 46.58 2.30 36.88 0.00 06Mar2018 8 p.m. 43.90 12.80 42.20 0.00 06Mar2018 9 p.m. 41.38 12.40 44.67 0.00 06Mar2018 10 p.m. 39.96 10.70 46.35 0.00 06Mar2018 11 p.m. 38.82 11.00 47.94 0.00 07Mar2018 12 a.m. 37.40 9.60 51.60 0.00 07Mar2018 1 a.m. 35.92 8.50 54.99 0.00 07Mar2018 2 a.m. 34.99 8.00 58.26 0.00 07Mar2018 3 a.m. 34.14 7.30 60.15 0.00 07Mar2018 4 a.m. 33.33 6.60 63.73 0.00 07Mar2018 5 a.m. 32.14 5.30 66.16 0.00 07Mar2018 6 a.m. 31.12 5.20 68.97 0.00 07Mar2018 7 a.m. 30.27 5.50 70.35 0.00 Accuml. Values 1039.69 301.00 985.69 5963.70 Num. Valid Values 24 24 24 24 Avg. Values 43.32 12.54 41.07 248.49 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 6.29 484.31 41.07 512.76 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5893 definition: xcompl = 1 - (RELH_avg/100) TdC = -6.0872 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 = 0.5002 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4998 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.7114 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 = 5.6851 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 8.4200 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.258 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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