Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
18May2018  8 a.m.    69.89     8.04    84.68   246.00
18May2018  9 a.m.    73.51     5.08    76.50   309.00
18May2018 10 a.m.    76.82     6.43    65.02   594.00
18May2018 11 a.m.    79.79     8.87    59.10   767.00
18May2018 12 p.m.    82.09     8.14    54.27   909.00
18May2018  1 p.m.    84.07     9.16    50.98   959.00
18May2018  2 p.m.    84.07     8.87    51.10   978.00
18May2018  3 p.m.    85.84     8.35    48.48   923.00
18May2018  4 p.m.    85.84     7.05    48.66   814.00
18May2018  5 p.m.    85.30     8.86    50.56   461.00
18May2018  6 p.m.    85.71     8.33    50.12   383.00
18May2018  7 p.m.    84.94     8.22    53.30   297.00
18May2018  8 p.m.    74.28     5.62    65.08    52.00
18May2018  9 p.m.    80.78     7.43    64.35     4.00
18May2018 10 p.m.    79.47     7.61    67.71     0.00
18May2018 11 p.m.    79.34     6.78    67.58     0.00
19May2018 12 a.m.    77.92     6.06    69.90     0.00
19May2018  1 a.m.    77.68     3.20    73.08     0.00
19May2018  2 a.m.    75.83     7.51    78.57     0.00
19May2018  3 a.m.    76.82     7.34    75.10     0.00
19May2018  4 a.m.    76.60     1.40    77.30     0.00
19May2018  5 a.m.    75.07     1.64    78.64     0.00
19May2018  6 a.m.    72.43     3.04    89.75     0.00
19May2018  7 a.m.    73.63     2.85    86.39     6.00

Accuml.
 Values            1897.73   155.88  1586.22  7702.00
Num. Valid
 Values                 24       24       24       24
Avg. Values          79.07     6.49    66.09   320.92

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

Converted Values     26.15   250.81    66.09   662.22

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

  xcompl = 0.3391   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =   19.4539   
   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 =    0.7522   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.2478   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =    9.1744   
   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 =   11.3038   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =    9.6947   
   definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)

Daily Evap:    0.366 inches
   definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4