Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 07Mar2018 8 a.m. 30.87 6.60 71.35 82.00 07Mar2018 9 a.m. 32.54 10.20 65.17 324.30 07Mar2018 10 a.m. 34.05 10.10 59.49 541.70 07Mar2018 11 a.m. 35.33 10.30 56.55 741.60 07Mar2018 12 p.m. 37.22 10.70 52.92 855.50 07Mar2018 1 p.m. 39.67 11.70 48.31 923.50 07Mar2018 2 p.m. 41.90 11.50 43.12 896.00 07Mar2018 3 p.m. 44.13 11.10 40.11 791.30 07Mar2018 4 p.m. 46.17 9.60 35.79 620.80 07Mar2018 5 p.m. 47.07 10.00 34.83 406.60 07Mar2018 6 p.m. 47.86 8.40 34.08 134.10 07Mar2018 7 p.m. 51.64 3.00 41.17 0.00 07Mar2018 8 p.m. 40.60 1.60 47.69 0.00 07Mar2018 9 p.m. 36.84 2.10 64.30 0.00 07Mar2018 10 p.m. 34.93 2.10 72.84 0.00 07Mar2018 11 p.m. 31.33 0.80 74.03 0.00 08Mar2018 12 a.m. 29.97 1.00 75.39 0.00 08Mar2018 1 a.m. 29.79 1.70 80.81 0.00 08Mar2018 2 a.m. 29.17 1.80 87.91 0.00 08Mar2018 3 a.m. 32.77 5.10 92.19 0.00 08Mar2018 4 a.m. 32.90 5.00 95.57 0.00 08Mar2018 5 a.m. 31.98 5.00 98.31 0.00 08Mar2018 6 a.m. 31.14 3.20 96.62 0.00 08Mar2018 7 a.m. 27.57 1.50 95.95 0.20 Accuml. Values 877.44 144.10 1564.50 6317.60 Num. Valid Values 24 24 24 24 Avg. Values 36.56 6.00 65.19 263.23 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 2.53 231.86 65.19 543.19 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3481 definition: xcompl = 1 - (RELH_avg/100) TdC = -3.3058 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 = 0.4426 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5574 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.8040 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 = 2.5555 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.4943 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.138 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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