Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
09Oct2018  8 a.m.    68.95     9.50   100.03     0.00
09Oct2018  9 a.m.    70.12    10.90   100.02     9.20
09Oct2018 10 a.m.    70.90    11.90   100.02    37.90
09Oct2018 11 a.m.    70.09    10.70    95.07    92.20
09Oct2018 12 p.m.    64.49     7.40    99.80     7.20
09Oct2018  1 p.m.    64.72     6.00   100.04   111.30
09Oct2018  2 p.m.    66.43     8.20    98.95   137.20
09Oct2018  3 p.m.    67.19     7.80    94.82    51.30
09Oct2018  4 p.m.    66.36     8.20    96.79    18.60
09Oct2018  5 p.m.    66.20     7.90    99.67    16.10
09Oct2018  6 p.m.    65.39    10.10    99.99     0.40
09Oct2018  7 p.m.    66.34     6.60    98.81     1.00
09Oct2018  8 p.m.    59.90    11.20    64.21     0.00
09Oct2018  9 p.m.    65.52     3.20   100.04     0.00
09Oct2018 10 p.m.    65.35     3.50   100.04     0.00
09Oct2018 11 p.m.    65.52     6.40   100.04     0.00
10Oct2018 12 a.m.    65.03     7.80   100.04     0.00
10Oct2018  1 a.m.    61.75    12.60    99.65     0.00
10Oct2018  2 a.m.    60.80    13.30    98.62     0.00
10Oct2018  3 a.m.    60.46    16.10    96.46     0.00
10Oct2018  4 a.m.    59.18    16.30    91.83     0.00
10Oct2018  5 a.m.    57.49    17.50    90.01     0.00
10Oct2018  6 a.m.    55.45    17.90    89.68     0.00
10Oct2018  7 a.m.    53.40    17.50    88.27     0.00

Accuml.
 Values            1537.05   248.50  2302.90   482.40
Num. Valid
 Values                 24       24       24       24
Avg. Values          64.04    10.35    95.95    20.10

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

Converted Values     17.80   399.84    95.95    41.48

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

  xcompl = 0.0405   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =   17.1301   
   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 =    0.6604   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.3396   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =   -0.5437   
   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 =    0.8462   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =    1.3636   
   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