Detailed Weather Data for Project: KEYS
Date Time TAIR WSPD RELH SRAD
12Jul2018 8 a.m. 79.90 3.55 82.91 181.00
12Jul2018 9 a.m. 83.52 2.70 74.42 376.00
12Jul2018 10 a.m. 87.03 2.45 66.00 567.00
12Jul2018 11 a.m. 89.24 3.72 60.51 733.00
12Jul2018 12 p.m. 90.55 5.95 53.72 857.00
12Jul2018 1 p.m. 91.98 5.15 51.95 785.00
12Jul2018 2 p.m. 94.39 6.00 42.49 920.00
12Jul2018 3 p.m. 95.27 6.00 37.91 791.00
12Jul2018 4 p.m. 95.16 6.34 37.36 795.00
12Jul2018 5 p.m. 96.04 5.60 34.86 671.00
12Jul2018 6 p.m. 96.04 4.95 38.10 500.00
12Jul2018 7 p.m. 95.27 5.93 38.40 321.00
12Jul2018 8 p.m. 91.33 4.82 52.63 122.00
12Jul2018 9 p.m. 88.90 6.22 45.42 16.00
12Jul2018 10 p.m. 86.59 3.83 49.39 0.00
12Jul2018 11 p.m. 83.95 3.70 62.45 0.00
13Jul2018 12 a.m. 82.63 3.77 68.25 0.00
13Jul2018 1 a.m. 81.10 2.99 73.02 0.00
13Jul2018 2 a.m. 79.34 1.33 77.17 0.00
13Jul2018 3 a.m. 77.68 2.28 81.38 0.00
13Jul2018 4 a.m. 77.25 0.22 87.06 0.00
13Jul2018 5 a.m. 74.84 2.03 92.98 0.00
13Jul2018 6 a.m. 73.85 2.01 95.54 0.00
13Jul2018 7 a.m. 74.52 4.70 93.17 24.00
Accuml.
Values 2066.38 96.24 1497.09 7659.00
Num. Valid
Values 24 24 24 24
Avg. Values 86.10 4.01 62.38 319.13
THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS:
SRAD == CAL / SQUARE CENTIMETER
WSPD == KILOMETERS PER DAY
TAIR == DEGREES CELSIUS
RELH == PERCENT
Converted Values 30.06 154.85 62.38 658.52
Now start computations towards evaporation in inches per day
Each intermediate calculation step will be shown.
xcompl = 0.3762
definition: xcompl = 1 - (RELH_avg/100)
TdC = 22.2319
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 = 0.7873
definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)
del_lambda2 = 0.2127
definition: del_lambda2 = 1 - del_lambda1
Qn = 9.6466
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 = 15.7457
definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))
Ea = 9.8300
definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)
Daily Evap: 0.381 inches
definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4
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