Detailed Weather Data for Project: KEYS
Date Time TAIR WSPD RELH SRAD
19May2018 8 a.m. 72.97 3.18 90.84 103.00
19May2018 9 a.m. 73.85 6.02 88.40 165.00
19May2018 10 a.m. 75.61 5.36 80.35 168.00
19May2018 11 a.m. 77.92 4.22 70.70 606.00
19May2018 12 p.m. 82.42 5.50 60.81 746.00
19May2018 1 p.m. 85.51 3.14 52.69 903.00
19May2018 2 p.m. 87.26 5.23 45.98 909.00
19May2018 3 p.m. 88.92 8.91 37.43 921.00
19May2018 4 p.m. 90.45 6.40 32.84 762.00
19May2018 5 p.m. 78.15 7.71 58.86 359.00
19May2018 6 p.m. 76.59 2.86 66.73 188.00
19May2018 7 p.m. 76.28 3.76 66.37 154.00
19May2018 8 p.m. 74.28 5.32 68.74 113.00
19May2018 9 p.m. 73.85 5.67 67.58 3.00
19May2018 10 p.m. 74.07 3.91 69.96 0.00
19May2018 11 p.m. 73.51 5.12 73.26 0.00
20May2018 12 a.m. 74.62 1.65 75.34 0.00
20May2018 1 a.m. 74.86 3.80 77.30 0.00
20May2018 2 a.m. 76.39 5.28 76.14 0.00
20May2018 3 a.m. 77.59 4.98 75.04 0.00
20May2018 4 a.m. 70.99 10.67 88.83 0.00
20May2018 5 a.m. 67.15 5.99 92.07 0.00
20May2018 6 a.m. 66.38 5.24 93.04 0.00
20May2018 7 a.m. 66.38 0.39 96.52 6.00
Accuml.
Values 1835.99 120.31 1705.82 6106.00
Num. Valid
Values 24 24 24 24
Avg. Values 76.50 5.01 71.08 254.42
THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS:
SRAD == CAL / SQUARE CENTIMETER
WSPD == KILOMETERS PER DAY
TAIR == DEGREES CELSIUS
RELH == PERCENT
Converted Values 24.72 193.58 71.08 524.99
Now start computations towards evaporation in inches per day
Each intermediate calculation step will be shown.
xcompl = 0.2892
definition: xcompl = 1 - (RELH_avg/100)
TdC = 19.2363
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 = 0.7381
definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)
del_lambda2 = 0.2619
definition: del_lambda2 = 1 - del_lambda1
Qn = 6.6787
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 = 8.8499
definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))
Ea = 6.6856
definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)
Daily Evap: 0.263 inches
definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4
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