Detailed Weather Data for Project: KEYS
Date Time TAIR WSPD RELH SRAD
19Mar2018 8 a.m. 52.32 10.85 51.36 11.00
19Mar2018 9 a.m. 51.01 13.58 77.18 192.00
19Mar2018 10 a.m. 52.66 15.11 78.96 419.00
19Mar2018 11 a.m. 51.01 22.30 81.34 346.00
19Mar2018 12 p.m. 49.35 20.64 82.43 87.00
19Mar2018 1 p.m. 47.93 22.59 76.93 105.00
19Mar2018 2 p.m. 48.25 21.46 71.74 174.00
19Mar2018 3 p.m. 47.82 24.72 76.64 228.00
19Mar2018 4 p.m. 48.04 23.28 77.37 120.00
19Mar2018 5 p.m. 47.82 21.84 74.99 62.00
19Mar2018 6 p.m. 47.37 20.90 75.28 24.00
19Mar2018 7 p.m. 46.51 21.03 82.87 13.00
19Mar2018 8 p.m. 52.21 7.79 45.43 16.00
19Mar2018 9 p.m. 46.94 15.85 76.82 0.00
19Mar2018 10 p.m. 47.28 17.22 73.09 0.00
19Mar2018 11 p.m. 46.83 18.49 71.75 0.00
20Mar2018 12 a.m. 46.94 19.30 76.70 1.00
20Mar2018 1 a.m. 46.83 16.40 75.54 0.00
20Mar2018 2 a.m. 46.29 18.01 74.13 0.00
20Mar2018 3 a.m. 46.17 18.94 77.98 0.00
20Mar2018 4 a.m. 45.41 17.87 75.72 0.00
20Mar2018 5 a.m. 44.53 16.59 77.61 0.00
20Mar2018 6 a.m. 44.20 15.47 80.19 0.00
20Mar2018 7 a.m. 43.86 17.77 77.31 0.00
Accuml.
Values 1147.60 438.00 1789.36 1798.00
Num. Valid
Values 24 24 24 24
Avg. Values 47.82 18.25 74.56 74.92
THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS:
SRAD == CAL / SQUARE CENTIMETER
WSPD == KILOMETERS PER DAY
TAIR == DEGREES CELSIUS
RELH == PERCENT
Converted Values 8.79 704.74 74.56 154.59
Now start computations towards evaporation in inches per day
Each intermediate calculation step will be shown.
xcompl = 0.2544
definition: xcompl = 1 - (RELH_avg/100)
TdC = 4.5534
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 = 0.5375
definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)
del_lambda2 = 0.4625
definition: del_lambda2 = 1 - del_lambda1
Qn = 0.5530
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 = 2.8668
definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))
Ea = 6.2245
definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)
Daily Evap: 0.125 inches
definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4
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