Detailed Weather Data for Project: JOHN

Date Time TAIR WSPD RELH SRAD 07Mar2018 8 a.m. 27.55 16.70 82.22 113.90 07Mar2018 9 a.m. 29.23 17.30 80.47 322.50 07Mar2018 10 a.m. 31.95 21.00 73.77 498.80 07Mar2018 11 a.m. 33.78 17.30 66.77 710.10 07Mar2018 12 p.m. 36.48 17.80 59.50 839.40 07Mar2018 1 p.m. 38.64 19.70 52.23 866.50 07Mar2018 2 p.m. 41.09 23.50 43.10 827.80 07Mar2018 3 p.m. 42.80 23.30 38.80 719.60 07Mar2018 4 p.m. 44.55 21.30 35.97 555.60 07Mar2018 5 p.m. 46.18 24.20 32.19 347.00 07Mar2018 6 p.m. 46.26 21.30 31.79 97.20 07Mar2018 7 p.m. 46.20 6.30 33.27 3.40 07Mar2018 8 p.m. 42.85 11.60 36.83 0.00 07Mar2018 9 p.m. 42.03 11.60 37.02 0.00 07Mar2018 10 p.m. 39.65 11.00 40.40 0.00 07Mar2018 11 p.m. 37.54 12.10 44.91 0.00 08Mar2018 12 a.m. 35.11 7.00 51.83 0.00 08Mar2018 1 a.m. 33.58 6.50 60.84 0.00 08Mar2018 2 a.m. 33.24 9.00 63.30 0.00 08Mar2018 3 a.m. 30.38 11.00 68.49 0.00 08Mar2018 4 a.m. 29.48 9.20 72.50 0.00 08Mar2018 5 a.m. 27.79 8.70 76.66 0.00 08Mar2018 6 a.m. 25.90 6.30 86.42 0.00 08Mar2018 7 a.m. 25.25 5.90 89.42 1.40 Accuml. Values 867.52 339.60 1358.70 5903.20 Num. Valid Values 24 24 24 24 Avg. Values 36.15 14.15 56.61 245.97 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 2.30 546.42 56.61 507.56 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4339 definition: xcompl = 1 - (RELH_avg/100) TdC = -5.4243 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 = 0.4391 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5609 definition: del_lambda2 = 1 - del_lambda1 Qn = 4.3347 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 = 3.1476 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 5.4986 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.196 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

Go to Tulsa District Water Control Home Page.