Detailed Weather Data for Project: ROBE

Date Time TAIR WSPD RELH SRAD 29Dec2017 8 a.m. 28.71 1.05 74.02 2.00 29Dec2017 9 a.m. 29.70 2.21 68.71 22.00 29Dec2017 10 a.m. 31.12 1.67 63.70 89.00 29Dec2017 11 a.m. 32.99 2.26 61.19 127.00 29Dec2017 12 p.m. 34.97 2.22 58.32 184.00 29Dec2017 1 p.m. 39.25 2.25 54.84 401.00 29Dec2017 2 p.m. 45.52 0.92 48.55 243.00 29Dec2017 3 p.m. 45.52 7.41 54.10 126.00 29Dec2017 4 p.m. 44.74 6.10 61.98 68.00 29Dec2017 5 p.m. 44.20 8.14 59.54 35.00 29Dec2017 6 p.m. 43.43 5.27 62.41 2.00 29Dec2017 7 p.m. 29.91 5.35 71.88 0.00 29Dec2017 8 p.m. 42.33 0.83 73.95 0.00 29Dec2017 9 p.m. 41.45 0.56 69.61 0.00 29Dec2017 10 p.m. 40.91 1.15 69.26 0.00 29Dec2017 11 p.m. 41.45 0.16 71.82 0.00 30Dec2017 12 a.m. 40.69 0.18 80.07 0.00 30Dec2017 1 a.m. 40.14 0.86 78.97 0.00 30Dec2017 2 a.m. 39.70 0.45 82.08 0.00 30Dec2017 3 a.m. 39.92 0.12 81.04 0.00 30Dec2017 4 a.m. 40.14 0.41 82.81 0.00 30Dec2017 5 a.m. 39.36 0.98 81.04 0.00 30Dec2017 6 a.m. 40.35 3.68 75.42 0.00 30Dec2017 7 a.m. 40.59 4.39 72.92 0.00 Accuml. Values 937.09 58.62 1658.23 1299.00 Num. Valid Values 24 24 24 24 Avg. Values 39.05 2.44 69.09 54.13 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 3.91 94.32 69.09 111.69 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.3091 definition: xcompl = 1 - (RELH_avg/100) TdC = -1.1974 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 = 0.4639 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5361 definition: del_lambda2 = 1 - del_lambda1 Qn = 0.0119 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 = 2.4969 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.5516 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.033 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

Go to Tulsa District Water Control Home Page.