Detailed Weather Data for Project: WEBB

Date Time TAIR WSPD RELH SRAD 01Jan2018 8 a.m. 6.98 5.80 73.96 0.90 01Jan2018 9 a.m. 7.07 4.60 71.56 123.50 01Jan2018 10 a.m. 8.73 5.00 64.34 322.00 01Jan2018 11 a.m. 10.85 5.60 57.29 480.40 01Jan2018 12 p.m. 13.32 6.40 51.87 585.00 01Jan2018 1 p.m. 15.40 7.10 47.47 622.90 01Jan2018 2 p.m. 16.88 7.70 44.48 589.70 01Jan2018 3 p.m. 18.61 6.90 40.44 489.90 01Jan2018 4 p.m. 19.74 6.00 38.50 328.00 01Jan2018 5 p.m. 19.51 3.60 36.43 103.20 01Jan2018 6 p.m. 18.18 3.10 39.08 0.00 01Jan2018 7 p.m. 22.23 1.40 41.69 0.00 01Jan2018 8 p.m. 16.09 7.10 55.67 0.00 01Jan2018 9 p.m. 14.83 5.90 51.45 0.00 01Jan2018 10 p.m. 14.29 2.90 50.17 0.00 01Jan2018 11 p.m. 14.88 1.90 48.98 0.00 02Jan2018 12 a.m. 14.92 0.60 49.92 0.00 02Jan2018 1 a.m. 14.40 2.30 54.60 0.00 02Jan2018 2 a.m. 13.21 1.00 56.16 0.00 02Jan2018 3 a.m. 14.90 1.90 53.91 0.00 02Jan2018 4 a.m. 15.04 2.60 55.13 0.00 02Jan2018 5 a.m. 15.06 3.70 53.63 0.00 02Jan2018 6 a.m. 15.13 3.10 53.07 0.00 02Jan2018 7 a.m. 15.30 4.20 50.81 0.00 Accuml. Values 355.53 100.40 1240.61 3645.50 Num. Valid Values 24 24 24 24 Avg. Values 14.81 4.18 51.69 151.90 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -9.55 161.54 51.69 313.44 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4831 definition: xcompl = 1 - (RELH_avg/100) TdC = -17.6754 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 = 0.2630 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7370 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.6245 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 = 1.4490 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.2314 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.053 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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