Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 02Dec2017 8 a.m. 41.94 1.90 99.47 16.50 02Dec2017 9 a.m. 42.17 2.90 97.98 168.90 02Dec2017 10 a.m. 42.57 3.90 98.84 336.50 02Dec2017 11 a.m. 44.83 3.50 93.99 463.30 02Dec2017 12 p.m. 50.38 2.90 78.99 531.60 02Dec2017 1 p.m. 60.94 4.90 51.84 533.10 02Dec2017 2 p.m. 61.79 1.90 51.13 473.00 02Dec2017 3 p.m. 63.84 5.80 44.77 360.30 02Dec2017 4 p.m. 63.52 6.20 44.04 207.40 02Dec2017 5 p.m. 62.51 3.70 45.49 42.50 02Dec2017 6 p.m. 60.24 3.40 50.61 0.00 02Dec2017 7 p.m. 61.29 16.70 83.80 0.00 02Dec2017 8 p.m. 50.70 4.40 74.43 0.00 02Dec2017 9 p.m. 48.90 4.90 81.34 0.00 02Dec2017 10 p.m. 46.47 3.80 89.71 0.00 02Dec2017 11 p.m. 47.32 4.00 94.66 0.00 03Dec2017 12 a.m. 46.51 3.00 92.37 0.00 03Dec2017 1 a.m. 44.49 2.90 95.41 0.00 03Dec2017 2 a.m. 42.78 3.10 100.21 0.00 03Dec2017 3 a.m. 44.56 1.20 99.64 0.00 03Dec2017 4 a.m. 42.84 1.50 100.23 0.00 03Dec2017 5 a.m. 44.46 1.50 99.68 0.00 03Dec2017 6 a.m. 41.47 1.40 100.23 0.00 03Dec2017 7 a.m. 41.79 3.90 100.23 0.00 Accuml. Values 1198.31 93.30 1969.09 3133.10 Num. Valid Values 24 24 24 24 Avg. Values 49.93 3.89 82.05 130.55 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 9.96 150.12 82.05 269.38 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.1795 definition: xcompl = 1 - (RELH_avg/100) TdC = 7.0463 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 = 0.5546 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.4454 definition: del_lambda2 = 1 - del_lambda1 Qn = 1.8969 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 = 2.1996 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.7116 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.071 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

Go to Tulsa District Water Control Home Page.