Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 04Mar2018 8 a.m. 12.78 9.00 89.00 124.00 04Mar2018 9 a.m. 13.89 14.00 83.00 261.00 04Mar2018 10 a.m. 18.33 13.00 51.00 435.00 04Mar2018 11 a.m. 21.11 14.00 25.00 603.00 04Mar2018 12 p.m. 24.44 13.00 16.00 729.00 04Mar2018 1 p.m. 26.67 16.00 8.00 801.00 04Mar2018 2 p.m. 26.67 15.00 7.00 768.00 04Mar2018 3 p.m. 27.22 19.00 6.00 655.00 04Mar2018 4 p.m. 27.22 21.00 4.00 505.00 04Mar2018 5 p.m. 26.11 21.00 4.00 314.00 04Mar2018 6 p.m. -901.00 -901.00 -901.00 -901.00 04Mar2018 7 p.m. 11.67 1.00 8.00 103.00 04Mar2018 8 p.m. 17.78 11.00 9.00 0.00 04Mar2018 9 p.m. 15.00 11.00 10.00 0.00 04Mar2018 10 p.m. 15.56 10.00 9.00 0.00 04Mar2018 11 p.m. 17.78 14.00 9.00 0.00 05Mar2018 12 a.m. 17.22 15.00 11.00 0.00 05Mar2018 1 a.m. 14.44 17.00 14.00 0.00 05Mar2018 2 a.m. 10.56 13.00 24.00 0.00 05Mar2018 3 a.m. 7.22 10.00 43.00 0.00 05Mar2018 4 a.m. 6.11 12.00 44.00 0.00 05Mar2018 5 a.m. 4.44 8.00 48.00 0.00 05Mar2018 6 a.m. 3.33 7.00 53.00 0.00 05Mar2018 7 a.m. 3.33 10.00 50.00 6.00 Accuml. Values 368.89 294.00 625.00 5304.00 Num. Valid Values 23 23 23 23 Avg. Values 16.04 12.78 27.17 230.61 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -8.87 493.61 27.17 475.87 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.7283 definition: xcompl = 1 - (RELH_avg/100) TdC = -24.4994 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 = 0.2723 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7277 definition: del_lambda2 = 1 - del_lambda1 Qn = 3.2804 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 = 2.3005 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.8541 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.146 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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