Detailed Weather Data for Project: KEYS
Date Time TAIR WSPD RELH SRAD
20Oct2018 8 a.m. 51.13 1.10 100.09 3.50
20Oct2018 9 a.m. 51.73 2.80 97.53 157.00
20Oct2018 10 a.m. 53.19 4.70 91.83 358.20
20Oct2018 11 a.m. 55.90 5.10 80.73 514.60
20Oct2018 12 p.m. 59.11 6.70 71.81 616.00
20Oct2018 1 p.m. 62.62 6.30 52.39 667.90
20Oct2018 2 p.m. 66.61 7.00 33.89 327.20
20Oct2018 3 p.m. 68.59 9.90 27.56 124.90
20Oct2018 4 p.m. 69.71 8.20 27.94 392.00
20Oct2018 5 p.m. 70.66 6.90 29.25 191.00
20Oct2018 6 p.m. 70.63 9.00 29.17 126.60
20Oct2018 7 p.m. 68.61 6.70 31.36 4.10
20Oct2018 8 p.m. 59.52 3.10 62.20 0.00
20Oct2018 9 p.m. 62.78 5.40 46.29 0.00
20Oct2018 10 p.m. 61.52 5.50 40.31 0.00
20Oct2018 11 p.m. 56.41 2.90 54.65 0.00
21Oct2018 12 a.m. 53.35 1.90 68.64 0.00
21Oct2018 1 a.m. 51.57 1.70 70.41 0.00
21Oct2018 2 a.m. 48.33 2.60 81.38 0.00
21Oct2018 3 a.m. 46.87 2.70 83.02 0.00
21Oct2018 4 a.m. 46.11 4.60 83.36 0.00
21Oct2018 5 a.m. 45.18 5.30 75.63 0.00
21Oct2018 6 a.m. 44.13 6.80 77.66 0.00
21Oct2018 7 a.m. 43.34 4.70 82.20 0.00
Accuml.
Values 1367.60 121.60 1499.30 3483.00
Num. Valid
Values 24 24 24 24
Avg. Values 56.98 5.07 62.47 145.13
THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS:
SRAD == CAL / SQUARE CENTIMETER
WSPD == KILOMETERS PER DAY
TAIR == DEGREES CELSIUS
RELH == PERCENT
Converted Values 13.88 195.65 62.47 299.47
Now start computations towards evaporation in inches per day
Each intermediate calculation step will be shown.
xcompl = 0.3753
definition: xcompl = 1 - (RELH_avg/100)
TdC = 6.8993
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 = 0.6096
definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)
del_lambda2 = 0.3904
definition: del_lambda2 = 1 - del_lambda1
Qn = 2.4708
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 = 5.9158
definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))
Ea = 4.7192
definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)
Daily Evap: 0.132 inches
definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4
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