Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 06Mar2018 8 a.m. 0.56 3.00 32.00 151.00 06Mar2018 9 a.m. 5.56 4.00 19.00 352.00 06Mar2018 10 a.m. 9.44 12.00 14.00 538.00 06Mar2018 11 a.m. 10.56 15.00 13.00 682.00 06Mar2018 12 p.m. 12.22 10.00 12.00 773.00 06Mar2018 1 p.m. 13.33 10.00 10.00 803.00 06Mar2018 2 p.m. 13.89 14.00 10.00 767.00 06Mar2018 3 p.m. 13.89 14.00 9.00 666.00 06Mar2018 4 p.m. 13.89 12.00 8.00 514.00 06Mar2018 5 p.m. 13.33 12.00 8.00 324.00 06Mar2018 6 p.m. -901.00 -901.00 -901.00 -901.00 06Mar2018 7 p.m. 12.78 4.00 12.00 71.00 06Mar2018 8 p.m. 6.11 7.00 17.00 0.00 06Mar2018 9 p.m. 3.89 4.00 22.00 0.00 06Mar2018 10 p.m. 2.78 4.00 25.00 0.00 06Mar2018 11 p.m. 0.56 1.00 31.00 0.00 07Mar2018 12 a.m. 0.00 0.00 31.00 0.00 07Mar2018 1 a.m. -1.11 3.00 52.00 0.00 07Mar2018 2 a.m. -3.33 3.00 52.00 0.00 07Mar2018 3 a.m. -3.89 3.00 51.00 0.00 07Mar2018 4 a.m. -5.00 4.00 54.00 0.00 07Mar2018 5 a.m. -5.00 5.00 64.00 0.00 07Mar2018 6 a.m. -5.00 6.00 66.00 0.00 07Mar2018 7 a.m. -4.44 4.00 65.00 10.00 Accuml. Values 105.00 154.00 677.00 5651.00 Num. Valid Values 22 22 23 23 Avg. Values 4.77 7.00 29.43 245.70 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -15.13 270.31 29.43 507.00 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.7057 definition: xcompl = 1 - (RELH_avg/100) TdC = -29.1057 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 = 0.1926 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8074 definition: del_lambda2 = 1 - del_lambda1 Qn = 3.3233 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 = 1.3417 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.5593 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.075 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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