Detailed Weather Data for Project:  KEYS

Date       Time       TAIR     WSPD     RELH     SRAD
13Jan2018  8 a.m.    20.80     6.85    45.20     3.00
13Jan2018  9 a.m.    21.13     7.60    46.42    45.00
13Jan2018 10 a.m.    22.12     7.71    44.16   202.00
13Jan2018 11 a.m.    23.22     7.72    43.49   447.00
13Jan2018 12 p.m.    24.98     6.57    41.29   380.00
13Jan2018  1 p.m.    27.50     7.36    37.99   525.00
13Jan2018  2 p.m.    29.70     7.43    36.46    83.00
13Jan2018  3 p.m.    31.35     4.31    32.80    57.00
13Jan2018  4 p.m.    32.77     3.90    31.82   255.00
13Jan2018  5 p.m.    33.98     2.18    25.22   119.00
13Jan2018  6 p.m.    30.25     5.04    29.01    12.00
13Jan2018  7 p.m.    44.42     1.88    35.18     1.00
13Jan2018  8 p.m.    29.14     6.31    31.33     0.00
13Jan2018  9 p.m.    28.92     6.29    33.47     0.00
13Jan2018 10 p.m.    28.81     6.29    36.46     0.00
13Jan2018 11 p.m.    29.14     4.19    35.79     0.00
14Jan2018 12 a.m.    29.57     3.85    36.33     0.00
14Jan2018  1 a.m.    29.70     2.69    37.56     0.00
14Jan2018  2 a.m.    28.92     4.15    40.00     0.00
14Jan2018  3 a.m.    28.81     3.99    40.67     0.00
14Jan2018  4 a.m.    29.03     1.87    40.98     0.00
14Jan2018  5 a.m.    28.71     3.45    43.24     0.00
14Jan2018  6 a.m.    28.60     4.77    45.19     0.00
14Jan2018  7 a.m.    28.49     5.00    46.96     0.00

Accuml.
 Values             690.06   121.40   917.02  2129.00
Num. Valid
 Values                 24       24       24       24
Avg. Values          28.75     5.06    38.21    88.71

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

Converted Values     -1.80   195.33    38.21   183.05

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

  xcompl = 0.6179   
   definition: xcompl = 1 - (RELH_avg/100)

  TdC =  -14.3169   
   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 =    0.3758   
   definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1)

  del_lambda2 =    0.6242   
   definition: del_lambda2 = 1 - del_lambda1

  Qn =    0.5843   
   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 =    3.3559   
   definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8))

  Ea =    2.8629   
   definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg)

Daily Evap:    0.079 inches
   definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4