Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
19Sep2018  8 a.m.    76.82     1.90    77.55    50.10
19Sep2018  9 a.m.    79.45     2.20    73.02   246.00
19Sep2018 10 a.m.    82.58     4.90    65.18   446.10
19Sep2018 11 a.m.    85.17     5.60    59.63   611.50
19Sep2018 12 p.m.    88.59     5.30    51.55   725.30
19Sep2018  1 p.m.    90.10     7.30    48.22   746.80
19Sep2018  2 p.m.    91.33     7.30    45.44   767.20
19Sep2018  3 p.m.    92.32     8.70    42.47   714.60
19Sep2018  4 p.m.    92.52     9.80    41.39   565.10
19Sep2018  5 p.m.    93.24     8.80    38.57   422.00
19Sep2018  6 p.m.    93.04     7.50    38.82   258.70
19Sep2018  7 p.m.    91.58     4.90    44.02    80.50
19Sep2018  8 p.m.    87.78     2.60    52.71     0.00
19Sep2018  9 p.m.    84.25     1.50    58.95     0.00
19Sep2018 10 p.m.    82.63     2.20    62.19     0.00
19Sep2018 11 p.m.    81.27     2.70    64.59     0.00
20Sep2018 12 a.m.    79.68     2.70    69.05     0.00
20Sep2018  1 a.m.    82.58     5.60    62.38     0.00
20Sep2018  2 a.m.    82.11     5.70    63.70     0.00
20Sep2018  3 a.m.    80.02     4.40    70.08     0.00
20Sep2018  4 a.m.    78.35     2.50    74.37     0.00
20Sep2018  5 a.m.    77.36     2.70    77.59     0.00
20Sep2018  6 a.m.    76.73     3.10    80.11     0.00
20Sep2018  7 a.m.    76.08     3.90    82.53     0.00

Accuml.
 Values            2025.59   113.80  1444.11  5633.90
Num. Valid
 Values                 24       24       24       24
Avg. Values          84.40     4.74    60.17   234.75

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

Converted Values     29.11   183.10    60.17   484.40

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

  xcompl = 0.3983   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =   20.7451   
   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 =    0.7793   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.2207   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =    6.4939   
   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 =   15.8238   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =   10.8038   
   definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)

Daily Evap:    0.293 inches
   definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4