Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 06Mar2018 8 a.m. 42.19 6.90 34.92 89.29 06Mar2018 9 a.m. 45.09 14.26 30.11 363.91 06Mar2018 10 a.m. 48.45 14.35 24.58 591.69 06Mar2018 11 a.m. 50.25 15.29 22.48 769.50 06Mar2018 12 p.m. 51.64 14.15 21.48 817.13 06Mar2018 1 p.m. 51.62 13.48 22.81 713.87 06Mar2018 2 p.m. 50.31 14.29 26.85 689.07 06Mar2018 3 p.m. 48.33 14.71 32.78 673.19 06Mar2018 4 p.m. 43.52 12.06 48.07 237.37 06Mar2018 5 p.m. 42.60 12.61 44.44 361.42 06Mar2018 6 p.m. 41.65 11.49 40.72 114.32 06Mar2018 7 p.m. 48.52 4.22 22.86 5.84 06Mar2018 8 p.m. 37.87 9.24 47.11 0.00 06Mar2018 9 p.m. 36.45 8.31 50.08 0.00 06Mar2018 10 p.m. 36.21 9.46 50.96 0.00 06Mar2018 11 p.m. 35.35 6.39 54.18 0.00 07Mar2018 12 a.m. 34.36 5.17 56.57 0.00 07Mar2018 1 a.m. 32.67 3.65 60.68 0.00 07Mar2018 2 a.m. 31.86 3.70 64.06 0.00 07Mar2018 3 a.m. 33.15 5.41 60.81 0.00 07Mar2018 4 a.m. 33.19 5.74 59.84 0.00 07Mar2018 5 a.m. 33.04 5.59 59.99 0.00 07Mar2018 6 a.m. 32.77 3.82 61.06 0.00 07Mar2018 7 a.m. 30.43 3.63 65.32 0.00 Accuml. Values 971.51 217.92 1062.76 5426.60 Num. Valid Values 24 24 24 24 Avg. Values 40.48 9.08 44.28 226.11 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 4.71 350.63 44.28 466.58 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5572 definition: xcompl = 1 - (RELH_avg/100) TdC = -6.5112 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 = 0.4761 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5239 definition: del_lambda2 = 1 - del_lambda1 Qn = 3.9955 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 = 4.8165 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 5.7307 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.193 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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