Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
12Jan2018  8 a.m.    15.30    14.00    75.56    12.00
12Jan2018  9 a.m.    15.96    13.35    72.32   182.00
12Jan2018 10 a.m.    16.95    13.59    65.66   375.00
12Jan2018 11 a.m.    19.36    11.74    59.25   525.00
12Jan2018 12 p.m.    23.11     9.11    55.52   612.00
12Jan2018  1 p.m.    25.84     7.54    49.47   576.00
12Jan2018  2 p.m.    28.27    10.56    40.68   203.00
12Jan2018  3 p.m.    29.91    10.42    37.07   123.00
12Jan2018  4 p.m.    30.13    10.75    37.56   237.00
12Jan2018  5 p.m.    30.47    10.22    36.10    56.00
12Jan2018  6 p.m.    28.49     8.49    39.15    10.00
12Jan2018  7 p.m.    29.93     5.26    29.93     0.00
12Jan2018  8 p.m.    26.08     5.71    44.77     0.00
12Jan2018  9 p.m.    26.40     6.53    45.07     0.00
12Jan2018 10 p.m.    25.84     4.02    45.50     0.00
12Jan2018 11 p.m.    26.19     5.65    47.27     1.00
13Jan2018 12 a.m.    25.95     8.13    50.93     0.00
13Jan2018  1 a.m.    24.87    10.18    52.22     0.00
13Jan2018  2 a.m.    23.43     9.18    57.77     0.00
13Jan2018  3 a.m.    23.43     9.24    54.97     0.00
13Jan2018  4 a.m.    23.43    10.71    53.20     0.00
13Jan2018  5 a.m.    22.55    10.02    50.33     0.00
13Jan2018  6 a.m.    21.79    10.70    43.55     1.00
13Jan2018  7 a.m.    21.34     8.57    45.69     0.00

Accuml.
 Values             585.05   223.67  1189.54  2913.00
Num. Valid
 Values                 24       24       24       24
Avg. Values          24.38     9.32    49.56   121.38

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

Converted Values     -4.23   359.89    49.56   250.46

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

  xcompl = 0.5044   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =  -13.2652   
   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 =    0.3391   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.6609   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =    1.1686   
   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 =    2.2804   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =    3.0233   
   definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)

Daily Evap:    0.094 inches
   definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4