Detailed Weather Data for Project: WIST

Date Time TAIR WSPD RELH SRAD 07Mar2018 8 a.m. 32.86 6.32 63.19 132.00 07Mar2018 9 a.m. 35.40 5.43 56.97 361.00 07Mar2018 10 a.m. 37.36 6.76 51.95 607.00 07Mar2018 11 a.m. 39.34 5.59 49.70 736.00 07Mar2018 12 p.m. 41.54 6.48 45.30 851.00 07Mar2018 1 p.m. 43.97 6.78 41.76 879.00 07Mar2018 2 p.m. 45.61 6.74 39.32 866.00 07Mar2018 3 p.m. 46.94 8.19 35.23 766.00 07Mar2018 4 p.m. 47.70 7.67 34.50 606.00 07Mar2018 5 p.m. 47.80 8.27 32.91 400.00 07Mar2018 6 p.m. 47.14 6.74 34.07 174.00 07Mar2018 7 p.m. 49.91 0.41 43.35 6.00 07Mar2018 8 p.m. 42.21 1.10 52.81 2.00 07Mar2018 9 p.m. 36.93 0.34 60.38 1.00 07Mar2018 10 p.m. 34.72 0.29 70.27 1.00 07Mar2018 11 p.m. 33.62 0.41 79.49 1.00 08Mar2018 12 a.m. 30.88 0.16 82.97 1.00 08Mar2018 1 a.m. 29.68 0.40 88.17 1.00 08Mar2018 2 a.m. 28.36 0.40 90.43 1.00 08Mar2018 3 a.m. 29.14 0.26 96.41 1.00 08Mar2018 4 a.m. 27.27 0.26 97.63 1.00 08Mar2018 5 a.m. 26.71 0.40 97.75 1.00 08Mar2018 6 a.m. 27.05 0.30 98.49 1.00 08Mar2018 7 a.m. 29.25 0.29 98.79 5.00 Accuml. Values 891.39 79.99 1541.84 6401.00 Num. Valid Values 24 24 24 24 Avg. Values 37.14 3.33 64.24 266.71 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 2.86 128.70 64.24 550.36 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3576 definition: xcompl = 1 - (RELH_avg/100) TdC = -3.1944 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 = 0.4476 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5524 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.9226 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 = 2.6861 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.8925 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.128 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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