Detailed Weather Data for Project: ELKC

Date Time TAIR WSPD RELH SRAD 02Jan2018 8 a.m. 7.74 4.87 56.75 0.00 02Jan2018 9 a.m. 8.22 3.25 55.48 62.97 02Jan2018 10 a.m. 11.01 1.58 51.28 178.76 02Jan2018 11 a.m. 13.03 0.83 50.24 242.09 02Jan2018 12 p.m. 15.19 1.80 50.39 349.40 02Jan2018 1 p.m. 17.20 3.71 46.44 407.24 02Jan2018 2 p.m. 21.47 2.99 39.99 565.38 02Jan2018 3 p.m. 22.51 3.29 37.90 230.24 02Jan2018 4 p.m. 23.95 4.30 35.99 226.34 02Jan2018 5 p.m. 24.21 2.49 34.92 78.06 02Jan2018 6 p.m. 23.67 1.63 35.54 0.50 02Jan2018 7 p.m. 29.03 2.33 42.50 0.00 02Jan2018 8 p.m. 21.29 1.51 47.36 0.00 02Jan2018 9 p.m. 20.26 2.01 45.61 0.00 02Jan2018 10 p.m. 18.99 3.07 48.72 0.00 02Jan2018 11 p.m. 18.88 4.60 49.55 0.00 03Jan2018 12 a.m. 18.55 5.19 49.08 0.00 03Jan2018 1 a.m. 17.94 8.20 51.88 0.00 03Jan2018 2 a.m. 18.01 4.79 51.67 0.00 03Jan2018 3 a.m. 18.88 5.89 51.00 0.00 03Jan2018 4 a.m. 18.14 4.57 53.29 0.00 03Jan2018 5 a.m. 17.38 4.21 56.42 0.00 03Jan2018 6 a.m. 17.37 1.82 55.04 0.00 03Jan2018 7 a.m. 17.04 1.83 55.85 0.00 Accuml. Values 439.97 80.76 1152.89 2340.98 Num. Valid Values 24 24 24 24 Avg. Values 18.33 3.36 48.04 97.54 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -7.59 129.94 48.04 201.28 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.5196 definition: xcompl = 1 - (RELH_avg/100) TdC = -16.7611 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 = 0.2902 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.7098 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.6371 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 = 1.8191 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.3491 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.045 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

Go to Tulsa District Water Control Home Page.