Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
21Oct2018  8 a.m.    43.03     1.30    81.64    11.20
21Oct2018  9 a.m.    42.96     2.00    85.12   173.80
21Oct2018 10 a.m.    47.79     3.60    73.28   357.50
21Oct2018 11 a.m.    54.03     5.50    53.05   507.80
21Oct2018 12 p.m.    58.19     4.00    47.29   607.80
21Oct2018  1 p.m.    61.38     3.90    40.89   654.70
21Oct2018  2 p.m.    63.21     4.70    36.63   315.70
21Oct2018  3 p.m.    64.80     4.20    38.15   126.30
21Oct2018  4 p.m.    66.49     3.40    34.93   371.50
21Oct2018  5 p.m.    67.86     3.50    34.78   123.30
21Oct2018  6 p.m.    65.50     4.30    41.51    53.00
21Oct2018  7 p.m.    63.63     2.70    56.02    11.30
21Oct2018  8 p.m.    59.92     3.20    71.38     0.00
21Oct2018  9 p.m.    57.56     5.50    60.02     0.00
21Oct2018 10 p.m.    55.96     6.40    56.96     0.00
21Oct2018 11 p.m.    54.50     7.70    57.23     0.00
22Oct2018 12 a.m.    53.28     7.10    60.83     0.00
22Oct2018  1 a.m.    52.63     5.70    64.94     0.00
22Oct2018  2 a.m.    52.18     4.90    67.03     0.00
22Oct2018  3 a.m.    51.33     3.30    69.58     0.00
22Oct2018  4 a.m.    50.04     3.20    72.82     0.00
22Oct2018  5 a.m.    50.43     2.70    70.95     0.00
22Oct2018  6 a.m.    50.83     2.50    72.56     0.00
22Oct2018  7 a.m.    48.45     3.90    76.90     0.00

Accuml.
 Values            1335.95    99.20  1424.49  3313.90
Num. Valid
 Values                 24       24       24       24
Avg. Values          55.66     4.13    59.35   138.08

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

Converted Values     13.15   159.61    59.35   284.93

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

  xcompl = 0.4065   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =    5.4544   
   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 =    0.5996   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.4004   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =    2.2461   
   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 =    6.1245   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =    4.3503   
   definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)

Daily Evap:    0.122 inches
   definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4