Detailed Weather Data for Project: ROBE

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 21.34 8.99 80.98 2.00 31Dec2017 9 a.m. 20.91 9.16 75.92 32.00 31Dec2017 10 a.m. 20.68 10.06 72.43 106.00 31Dec2017 11 a.m. 21.34 10.74 64.92 177.00 31Dec2017 12 p.m. 23.32 9.15 54.78 413.00 31Dec2017 1 p.m. 25.41 10.42 42.20 622.00 31Dec2017 2 p.m. 25.63 10.69 37.19 515.00 31Dec2017 3 p.m. 25.95 10.43 30.29 444.00 31Dec2017 4 p.m. 25.74 11.31 31.70 310.00 31Dec2017 5 p.m. 24.10 10.34 29.68 144.00 31Dec2017 6 p.m. 21.99 10.75 31.02 5.00 31Dec2017 7 p.m. 19.15 5.87 41.77 0.00 31Dec2017 8 p.m. 18.93 8.13 38.24 0.00 31Dec2017 9 p.m. 17.82 7.47 42.87 0.00 31Dec2017 10 p.m. 16.74 7.26 47.64 0.00 31Dec2017 11 p.m. 15.96 6.89 50.32 0.00 01Jan2018 12 a.m. 15.08 6.92 52.03 0.00 01Jan2018 1 a.m. 13.98 6.97 55.76 0.00 01Jan2018 2 a.m. 12.99 7.22 57.84 0.00 01Jan2018 3 a.m. 12.43 7.68 58.57 0.00 01Jan2018 4 a.m. 11.66 8.43 59.42 0.00 01Jan2018 5 a.m. 10.80 9.36 61.87 0.00 01Jan2018 6 a.m. 10.13 7.38 63.58 0.00 01Jan2018 7 a.m. 9.25 5.38 65.29 0.00 Accuml. Values 441.34 207.00 1246.31 2770.00 Num. Valid Values 24 24 24 24 Avg. Values 18.39 8.62 51.93 115.42 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -7.56 333.06 51.93 238.16 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4807 definition: xcompl = 1 - (RELH_avg/100) TdC = -15.7697 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 = 0.2906 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7094 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.9715 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 = 1.6843 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.1927 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.072 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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