Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
20Mar2018  8 a.m.    43.97    19.01    78.83     3.00
20Mar2018  9 a.m.    43.88    15.84    76.46    35.00
20Mar2018 10 a.m.    44.53    17.27    75.66    94.00
20Mar2018 11 a.m.    44.42    20.57    73.34    99.00
20Mar2018 12 p.m.    45.64    17.43    69.07   223.00
20Mar2018  1 p.m.    47.82    14.68    63.57   513.00
20Mar2018  2 p.m.    49.48    13.53    60.94   829.00
20Mar2018  3 p.m.    50.90    12.43    53.98   599.00
20Mar2018  4 p.m.    51.89    12.91    55.20   656.00
20Mar2018  5 p.m.    52.21    14.33    49.71   610.00
20Mar2018  6 p.m.    52.66    13.39    46.04   412.00
20Mar2018  7 p.m.    53.10    10.51    48.97   190.00
20Mar2018  8 p.m.    57.72     6.72    35.23     9.00
20Mar2018  9 p.m.    51.01     3.73    48.73     0.00
20Mar2018 10 p.m.    48.60     0.90    54.59     0.00
20Mar2018 11 p.m.    41.54     0.64    74.31     0.00
21Mar2018 12 a.m.    44.31     0.46    69.98     0.00
21Mar2018  1 a.m.    44.20     2.55    83.66     0.00
21Mar2018  2 a.m.    39.25     2.06    83.60     0.00
21Mar2018  3 a.m.    40.01     0.69    82.55     0.00
21Mar2018  4 a.m.    36.28     2.44    90.44     0.00
21Mar2018  5 a.m.    40.35     1.55    81.40     0.00
21Mar2018  6 a.m.    34.20     0.05    94.28     0.00
21Mar2018  7 a.m.    36.50     0.54    85.61     0.00

Accuml.
 Values            1094.48   204.23  1636.15  4272.00
Num. Valid
 Values                 24       24       24       24
Avg. Values          45.60     8.51    68.17   178.00

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

Converted Values      7.56   328.61    68.17   367.31

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

  xcompl = 0.3183   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =    2.1160   
   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 =    0.5192   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.4808   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =    2.9501   
   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 =    3.3013   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =    3.9274   
   definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)

Daily Evap:    0.135 inches
   definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4