Detailed Weather Data for Project: MERE

Date Time TAIR WSPD RELH SRAD 04Dec2017 8 a.m. 12.78 12.00 42.00 29.00 04Dec2017 9 a.m. 14.44 11.00 39.00 152.00 04Dec2017 10 a.m. 17.22 18.00 32.00 201.00 04Dec2017 11 a.m. 18.33 18.00 27.00 263.00 04Dec2017 12 p.m. 18.89 18.00 23.00 304.00 04Dec2017 1 p.m. 16.67 9.00 25.00 360.00 04Dec2017 2 p.m. 17.22 12.00 22.00 416.00 04Dec2017 3 p.m. 15.56 12.00 21.00 346.00 04Dec2017 4 p.m. 13.89 9.00 20.00 122.00 04Dec2017 5 p.m. 12.22 6.00 19.00 38.00 04Dec2017 6 p.m. -901.00 -901.00 -901.00 -901.00 04Dec2017 7 p.m. 2.78 6.00 30.00 1.00 04Dec2017 8 p.m. 5.56 8.00 38.00 0.00 04Dec2017 9 p.m. 3.89 8.00 42.00 0.00 04Dec2017 10 p.m. 2.22 5.00 49.00 0.00 04Dec2017 11 p.m. 2.22 5.00 47.00 0.00 05Dec2017 12 a.m. 2.22 7.00 43.00 0.00 05Dec2017 1 a.m. 1.67 9.00 42.00 0.00 05Dec2017 2 a.m. 1.11 7.00 39.00 0.00 05Dec2017 3 a.m. 1.11 6.00 37.00 0.00 05Dec2017 4 a.m. 1.11 7.00 37.00 0.00 05Dec2017 5 a.m. 0.56 6.00 38.00 0.00 05Dec2017 6 a.m. -0.56 3.00 41.00 0.00 05Dec2017 7 a.m. 0.00 1.00 39.00 0.00 Accuml. Values 181.11 203.00 792.00 2232.00 Num. Valid Values 22 23 23 23 Avg. Values 8.23 8.83 34.43 97.04 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -13.20 340.83 34.43 200.25 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.6557 definition: xcompl = 1 - (RELH_avg/100) TdC = -25.7293 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 = 0.2156 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7844 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.5461 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 = 1.4663 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.9725 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.066 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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