Detailed Weather Data for Project: KEYS
Date Time TAIR WSPD RELH SRAD
20May2018 8 a.m. 66.92 4.28 94.38 34.00
20May2018 9 a.m. 66.27 3.59 96.53 34.00
20May2018 10 a.m. 67.05 2.65 97.26 235.00
20May2018 11 a.m. 69.57 2.53 84.32 376.00
20May2018 12 p.m. 70.88 5.64 76.31 162.00
20May2018 1 p.m. 71.10 7.52 77.41 187.00
20May2018 2 p.m. 72.10 9.11 77.79 487.00
20May2018 3 p.m. 73.09 7.04 76.26 602.00
20May2018 4 p.m. 71.65 7.73 82.61 245.00
20May2018 5 p.m. 73.85 4.48 72.41 540.00
20May2018 6 p.m. 74.41 4.41 72.78 430.00
20May2018 7 p.m. 73.96 5.70 71.67 307.00
20May2018 8 p.m. 81.77 2.88 56.72 119.00
20May2018 9 p.m. 71.20 7.18 80.16 10.00
20May2018 10 p.m. 68.36 11.59 86.76 0.00
20May2018 11 p.m. 67.48 4.19 87.62 0.00
21May2018 12 a.m. 66.92 0.65 88.03 0.00
21May2018 1 a.m. 66.15 2.16 89.38 0.00
21May2018 2 a.m. 65.17 0.81 90.79 0.00
21May2018 3 a.m. 64.63 1.14 93.36 0.00
21May2018 4 a.m. 63.95 1.29 92.43 0.00
21May2018 5 a.m. 63.09 0.84 93.23 0.00
21May2018 6 a.m. 61.66 1.28 94.64 0.00
21May2018 7 a.m. 61.11 0.91 94.39 25.00
Accuml.
Values 1652.34 99.60 2027.24 3793.00
Num. Valid
Values 24 24 24 24
Avg. Values 68.85 4.15 84.47 158.04
THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS:
SRAD == CAL / SQUARE CENTIMETER
WSPD == KILOMETERS PER DAY
TAIR == DEGREES CELSIUS
RELH == PERCENT
Converted Values 20.47 160.26 84.47 326.12
Now start computations towards evaporation in inches per day
Each intermediate calculation step will be shown.
xcompl = 0.1553
definition: xcompl = 1 - (RELH_avg/100)
TdC = 17.7793
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 = 0.6922
definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)
del_lambda2 = 0.3078
definition: del_lambda2 = 1 - del_lambda1
Qn = 3.2471
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 = 3.7147
definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))
Ea = 2.8077
definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)
Daily Evap: 0.123 inches
definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4
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