Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
21Sep2018  8 a.m.    70.50     9.50    99.66     0.00
21Sep2018  9 a.m.    70.41     9.80   100.03    30.40
21Sep2018 10 a.m.    70.84     9.80   100.03    50.90
21Sep2018 11 a.m.    71.13     6.00   100.03    17.10
21Sep2018 12 p.m.    70.93     5.70   100.03    46.60
21Sep2018  1 p.m.    70.56     6.90   100.00    30.70
21Sep2018  2 p.m.    69.39     7.20   100.04     5.10
21Sep2018  3 p.m.    70.14    10.40   100.03    43.10
21Sep2018  4 p.m.    69.30    12.30    97.46    29.00
21Sep2018  5 p.m.    64.00    11.80    93.22    15.40
21Sep2018  6 p.m.    63.97    12.60    91.94     2.80
21Sep2018  7 p.m.    64.00    10.10    92.57     0.00
21Sep2018  8 p.m.    70.05     6.20    74.91     0.00
21Sep2018  9 p.m.    62.10    10.00    98.43     0.00
21Sep2018 10 p.m.    61.20    10.90    98.73     0.00
21Sep2018 11 p.m.    61.16     9.90    95.90     0.00
22Sep2018 12 a.m.    61.59     6.80    91.28     0.00
22Sep2018  1 a.m.    61.79     7.20    90.10     0.00
22Sep2018  2 a.m.    62.13     8.60    85.70     0.00
22Sep2018  3 a.m.    61.48     4.70    87.74     0.00
22Sep2018  4 a.m.    61.50     5.70    86.36     0.00
22Sep2018  5 a.m.    61.20     6.30    85.80     0.00
22Sep2018  6 a.m.    60.62     6.30    86.17     0.00
22Sep2018  7 a.m.    60.06     6.00    85.50     0.00

Accuml.
 Values            1570.06   200.70  2241.66   271.10
Num. Valid
 Values                 24       24       24       24
Avg. Values          65.42     8.36    93.40    11.30

 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS:
SRAD  == CAL / SQUARE CENTIMETER
WSPD  == KILOMETERS PER DAY
TAIR  == DEGREES CELSIUS
RELH  == PERCENT  

Converted Values     18.57   322.93    93.40    23.31

Now start computations towards evaporation in inches per day
Each intermediate calculation step will be shown.

  xcompl = 0.0660   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =   17.4615   
   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 =    0.6697   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.3303   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =   -0.7500   
   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 =    1.4339   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =    1.8628   
   definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)

Daily Evap:    0.004 inches
   definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4