Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. -15.56 4.00 58.00 16.00 01Jan2018 9 a.m. -11.67 2.00 45.00 140.00 01Jan2018 10 a.m. -8.89 1.00 36.00 318.00 01Jan2018 11 a.m. -7.78 4.00 34.00 433.00 01Jan2018 12 p.m. -6.11 5.00 37.00 512.00 01Jan2018 1 p.m. -4.44 4.00 32.00 521.00 01Jan2018 2 p.m. -3.89 6.00 31.00 473.00 01Jan2018 3 p.m. -3.33 7.00 32.00 353.00 01Jan2018 4 p.m. -5.00 8.00 37.00 230.00 01Jan2018 5 p.m. -6.67 8.00 38.00 42.00 01Jan2018 6 p.m. -901.00 -901.00 -901.00 -901.00 01Jan2018 7 p.m. -3.33 0.00 41.00 2.00 01Jan2018 8 p.m. -10.56 8.00 44.00 0.00 01Jan2018 9 p.m. -11.11 9.00 45.00 0.00 01Jan2018 10 p.m. -11.67 9.00 48.00 0.00 01Jan2018 11 p.m. -11.67 11.00 48.00 0.00 02Jan2018 12 a.m. -11.67 10.00 48.00 0.00 02Jan2018 1 a.m. -12.22 9.00 48.00 0.00 02Jan2018 2 a.m. -12.78 3.00 51.00 0.00 02Jan2018 3 a.m. -13.89 2.00 57.00 0.00 02Jan2018 4 a.m. -15.00 1.00 59.00 0.00 02Jan2018 5 a.m. -15.56 1.00 62.00 0.00 02Jan2018 6 a.m. -16.11 4.00 65.00 0.00 02Jan2018 7 a.m. -16.11 1.00 68.00 0.00 Accuml. Values -235.00 117.00 1064.00 3040.00 Num. Valid Values 23 22 23 23 Avg. Values -10.22 5.32 46.26 132.17 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -23.45 205.37 46.26 272.74 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5374 definition: xcompl = 1 - (RELH_avg/100) TdC = -31.8163 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 = 0.1110 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.8890 definition: del_lambda2 = 1 - del_lambda1 Qn = -1.#IND 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 = 0.4949 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 0.5469 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: -1.#IO inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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