Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 07Mar2018 8 a.m. -1.67 5.00 55.00 116.00 07Mar2018 9 a.m. 3.33 5.00 27.00 354.00 07Mar2018 10 a.m. 6.67 8.00 21.00 537.00 07Mar2018 11 a.m. 9.44 7.00 17.00 679.00 07Mar2018 12 p.m. 11.67 11.00 16.00 775.00 07Mar2018 1 p.m. 14.44 14.00 13.00 805.00 07Mar2018 2 p.m. 15.00 13.00 12.00 716.00 07Mar2018 3 p.m. 15.56 12.00 11.00 566.00 07Mar2018 4 p.m. 16.11 6.00 10.00 463.00 07Mar2018 5 p.m. 16.67 4.00 10.00 276.00 07Mar2018 6 p.m. -901.00 -901.00 -901.00 -901.00 07Mar2018 7 p.m. 20.00 4.00 10.00 135.00 07Mar2018 8 p.m. 7.22 9.00 19.00 0.00 07Mar2018 9 p.m. 6.11 10.00 21.00 0.00 07Mar2018 10 p.m. 6.11 8.00 22.00 0.00 07Mar2018 11 p.m. 6.11 8.00 21.00 0.00 08Mar2018 12 a.m. 4.44 1.00 24.00 0.00 08Mar2018 1 a.m. 2.78 1.00 26.00 0.00 08Mar2018 2 a.m. 2.78 2.00 46.00 0.00 08Mar2018 3 a.m. 1.67 2.00 30.00 0.00 08Mar2018 4 a.m. 0.00 0.00 53.00 0.00 08Mar2018 5 a.m. 0.00 0.00 54.00 0.00 08Mar2018 6 a.m. 0.00 0.00 38.00 0.00 08Mar2018 7 a.m. 0.00 1.00 55.00 5.00 Accuml. Values 164.44 131.00 611.00 5427.00 Num. Valid Values 19 20 23 23 Avg. Values 8.65 6.55 26.57 235.96 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -12.97 252.93 26.57 486.90 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.7343 definition: xcompl = 1 - (RELH_avg/100) TdC = -28.2969 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 = 0.2185 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7815 definition: del_lambda2 = 1 - del_lambda1 Qn = 3.2087 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 = 1.6669 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.8085 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.083 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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