Detailed Weather Data for Project: FOSS

Date Time TAIR WSPD RELH SRAD 31Dec2017 8 a.m. 12.70 13.09 63.00 4.00 31Dec2017 9 a.m. 12.32 14.99 61.33 93.33 31Dec2017 10 a.m. 13.51 14.60 58.00 234.00 31Dec2017 11 a.m. 15.80 14.09 53.67 368.33 31Dec2017 12 p.m. 17.38 16.16 46.25 480.50 31Dec2017 1 p.m. 17.90 16.03 40.67 500.33 31Dec2017 2 p.m. 19.54 14.88 35.00 534.50 31Dec2017 3 p.m. 19.36 13.76 33.75 396.00 31Dec2017 4 p.m. 18.41 13.92 34.25 224.00 31Dec2017 5 p.m. 16.30 12.58 36.50 82.50 31Dec2017 6 p.m. 14.36 8.05 39.00 0.00 31Dec2017 7 p.m. 13.46 7.16 43.00 0.00 31Dec2017 8 p.m. 13.10 8.50 45.00 0.00 31Dec2017 9 p.m. 12.56 9.17 46.50 0.00 31Dec2017 10 p.m. 11.36 7.61 49.00 0.00 31Dec2017 11 p.m. 10.45 8.00 51.25 0.00 01Jan2018 12 a.m. 9.73 8.16 53.25 0.00 01Jan2018 1 a.m. 8.47 7.61 56.75 0.00 01Jan2018 2 a.m. 7.66 8.67 59.00 0.00 01Jan2018 3 a.m. 7.40 9.84 57.67 0.00 01Jan2018 4 a.m. 6.98 10.23 58.00 0.00 01Jan2018 5 a.m. 5.72 9.84 60.50 0.00 01Jan2018 6 a.m. 4.10 8.44 63.00 0.00 01Jan2018 7 a.m. 2.75 7.61 66.00 0.00 Accuml. Values 291.32 262.99 1210.34 2917.49 Num. Valid Values 24 24 24 24 Avg. Values 12.14 10.96 50.43 121.56 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -11.03 423.15 50.43 250.85 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4957 definition: xcompl = 1 - (RELH_avg/100) TdC = -19.3559 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 = 0.2432 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7568 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.0161 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 = 1.3216 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 2.1052 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.072 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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