Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 06Mar2018 8 a.m. 42.40 35.80 41.16 130.30 06Mar2018 9 a.m. 43.32 42.70 41.12 356.90 06Mar2018 10 a.m. 42.82 40.80 45.43 524.80 06Mar2018 11 a.m. 39.90 46.50 60.19 408.30 06Mar2018 12 p.m. 39.36 39.30 61.81 357.40 06Mar2018 1 p.m. 38.98 35.70 64.28 263.60 06Mar2018 2 p.m. 38.34 37.10 62.73 282.20 06Mar2018 3 p.m. 37.74 36.60 59.99 283.40 06Mar2018 4 p.m. 37.72 34.00 57.35 152.40 06Mar2018 5 p.m. 37.89 34.40 57.04 201.10 06Mar2018 6 p.m. 37.26 32.90 58.15 61.20 06Mar2018 7 p.m. 44.71 16.40 33.56 0.00 06Mar2018 8 p.m. 36.27 29.40 61.16 0.00 06Mar2018 9 p.m. 35.60 29.30 63.30 0.00 06Mar2018 10 p.m. 35.06 25.20 64.70 0.00 06Mar2018 11 p.m. 34.32 25.10 67.10 0.00 07Mar2018 12 a.m. 33.42 24.80 67.80 0.00 07Mar2018 1 a.m. 32.85 22.20 67.34 0.00 07Mar2018 2 a.m. 32.54 21.50 66.13 0.00 07Mar2018 3 a.m. 32.52 17.90 67.03 0.00 07Mar2018 4 a.m. 32.38 17.30 68.36 0.00 07Mar2018 5 a.m. 30.78 18.30 70.20 0.00 07Mar2018 6 a.m. 29.10 17.60 77.07 0.00 07Mar2018 7 a.m. 28.11 19.10 80.20 0.00 Accuml. Values 873.39 699.90 1463.20 3021.60 Num. Valid Values 24 24 24 24 Avg. Values 36.39 29.16 60.97 125.90 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 2.44 1126.14 60.97 259.80 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3903 definition: xcompl = 1 - (RELH_avg/100) TdC = -4.2968 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 = 0.4412 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5588 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.4759 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 = 2.8519 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 9.2693 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.230 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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