Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 05Mar2018 8 a.m. 5.56 10.00 39.00 137.00 05Mar2018 9 a.m. 9.44 15.00 19.00 336.00 05Mar2018 10 a.m. 11.11 19.00 8.00 535.00 05Mar2018 11 a.m. 12.22 16.00 8.00 673.00 05Mar2018 12 p.m. 12.78 16.00 6.00 770.00 05Mar2018 1 p.m. 13.89 14.00 6.00 807.00 05Mar2018 2 p.m. 14.44 13.00 6.00 769.00 05Mar2018 3 p.m. 15.00 11.00 6.00 670.00 05Mar2018 4 p.m. 15.00 8.00 7.00 510.00 05Mar2018 5 p.m. 14.44 5.00 6.00 323.00 05Mar2018 6 p.m. -901.00 -901.00 -901.00 -901.00 05Mar2018 7 p.m. 11.11 10.00 10.00 119.00 05Mar2018 8 p.m. 5.56 5.00 10.00 0.00 05Mar2018 9 p.m. 3.89 7.00 11.00 0.00 05Mar2018 10 p.m. 2.78 6.00 12.00 0.00 05Mar2018 11 p.m. 0.00 3.00 43.00 0.00 06Mar2018 12 a.m. 1.67 4.00 16.00 0.00 06Mar2018 1 a.m. 2.78 6.00 15.00 0.00 06Mar2018 2 a.m. 1.67 4.00 17.00 0.00 06Mar2018 3 a.m. 0.56 2.00 18.00 0.00 06Mar2018 4 a.m. -1.11 0.00 33.00 0.00 06Mar2018 5 a.m. -2.22 0.00 30.00 0.00 06Mar2018 6 a.m. -3.33 3.00 46.00 0.00 06Mar2018 7 a.m. -5.00 4.00 39.00 7.00 Accuml. Values 142.22 181.00 411.00 5656.00 Num. Valid Values 22 21 23 23 Avg. Values 6.46 8.62 17.87 245.91 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -14.19 332.83 17.87 507.45 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.8213 definition: xcompl = 1 - (RELH_avg/100) TdC = -33.3781 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 = 0.2037 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7963 definition: del_lambda2 = 1 - del_lambda1 Qn = 3.3657 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 = 1.6770 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.1832 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.095 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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