Detailed Weather Data for Project: KEYS
Date Time TAIR WSPD RELH SRAD
20Sep2018 8 a.m. 76.15 4.40 84.10 40.90
20Sep2018 9 a.m. 76.91 4.40 84.27 82.60
20Sep2018 10 a.m. 79.45 6.50 79.59 323.00
20Sep2018 11 a.m. 84.04 7.00 65.50 604.80
20Sep2018 12 p.m. 86.31 8.10 58.82 678.50
20Sep2018 1 p.m. 88.00 7.60 53.12 745.70
20Sep2018 2 p.m. 89.26 8.90 48.17 516.90
20Sep2018 3 p.m. 89.91 10.40 46.58 589.90
20Sep2018 4 p.m. 90.41 13.10 44.57 527.50
20Sep2018 5 p.m. 91.33 10.50 40.83 413.60
20Sep2018 6 p.m. 91.36 8.60 40.94 252.50
20Sep2018 7 p.m. 90.18 6.90 43.09 74.60
20Sep2018 8 p.m. 63.18 8.40 96.94 0.00
20Sep2018 9 p.m. 84.99 7.00 52.63 0.00
20Sep2018 10 p.m. 83.82 6.40 55.02 0.00
20Sep2018 11 p.m. 82.80 5.10 57.45 0.00
21Sep2018 12 a.m. 81.66 5.40 60.87 0.00
21Sep2018 1 a.m. 79.95 3.90 66.25 0.00
21Sep2018 2 a.m. 78.71 2.90 70.75 0.00
21Sep2018 3 a.m. 77.31 1.80 75.79 0.00
21Sep2018 4 a.m. 74.91 1.80 84.51 0.00
21Sep2018 5 a.m. 74.08 1.50 85.86 0.00
21Sep2018 6 a.m. 75.49 5.80 79.72 0.00
21Sep2018 7 a.m. 74.79 6.10 82.66 0.00
Accuml.
Values 1964.98 152.50 1558.03 4850.50
Num. Valid
Values 24 24 24 24
Avg. Values 81.87 6.35 64.92 202.10
THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS:
SRAD == CAL / SQUARE CENTIMETER
WSPD == KILOMETERS PER DAY
TAIR == DEGREES CELSIUS
RELH == PERCENT
Converted Values 27.71 245.37 64.92 417.05
Now start computations towards evaporation in inches per day
Each intermediate calculation step will be shown.
xcompl = 0.3508
definition: xcompl = 1 - (RELH_avg/100)
TdC = 20.6512
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 = 0.7668
definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)
del_lambda2 = 0.2332
definition: del_lambda2 = 1 - del_lambda1
Qn = 5.2338
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 = 12.8115
definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))
Ea = 10.6751
definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)
Daily Evap: 0.256 inches
definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4
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