Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
11Jan2018  8 a.m.    52.56     2.79    94.54     4.00
11Jan2018  9 a.m.    38.16    15.15    84.57    41.00
11Jan2018 10 a.m.    32.32    26.67    81.34    21.00
11Jan2018 11 a.m.    29.14    25.24    73.71    43.00
11Jan2018 12 p.m.    27.82    24.02    72.55    76.00
11Jan2018  1 p.m.    26.73    25.59    72.98    73.00
11Jan2018  2 p.m.    25.07    27.46    73.64    82.00
11Jan2018  3 p.m.    25.95    24.54    74.75    54.00
11Jan2018  4 p.m.    27.18    24.40    69.56   105.00
11Jan2018  5 p.m.    25.84    21.79    59.61    91.00
11Jan2018  6 p.m.    24.53    19.30    63.03    12.00
11Jan2018  7 p.m.    26.83     6.61    42.38     0.00
11Jan2018  8 p.m.    21.56    23.09    64.80     0.00
11Jan2018  9 p.m.    21.34    21.03    68.23     0.00
11Jan2018 10 p.m.    20.79    17.68    67.55     0.00
11Jan2018 11 p.m.    21.13    18.18    68.53     0.00
12Jan2018 12 a.m.    20.80    18.49    65.42     0.00
12Jan2018  1 a.m.    20.03    17.35    65.78     0.00
12Jan2018  2 a.m.    19.26    17.72    66.64     0.00
12Jan2018  3 a.m.    18.61    16.23    67.68     0.00
12Jan2018  4 a.m.    17.60    14.14    71.76     0.00
12Jan2018  5 a.m.    17.49    13.16    74.26     0.00
12Jan2018  6 a.m.    16.63    14.10    73.97     0.00
12Jan2018  7 a.m.    15.40    15.74    72.93     0.00

Accuml.
 Values             592.77   450.47  1690.21   602.00
Num. Valid
 Values                 24       24       24       24
Avg. Values          24.70    18.77    70.43    25.08

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

Converted Values     -4.06   724.81    70.43    51.76

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

  xcompl = 0.2957   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =   -8.6132   
   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 =    0.3418   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.6582   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =   -0.6041   
   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 =    1.3443   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =    3.2719   
   definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)

Daily Evap:    0.077 inches
   definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4