Central Valley Aquifer, Chapters A and B - MAE Class Websites

Table C6. Average area-weighted composite efficiency for each
water-balance subregion of the Central Valley, California, through
the simulation period.
Waterbalance
subregion
Climate Data
1960s 1970s 1980s 1990s 2000s
1 70 68 73 76 74
2 70 68 72 75 73
3 74 74 79 82 83
4 71 70 74 78 79
5 73 72 78 80 80
6 69 69 74 77 77
7 71 69 73 77 77
8 69 69 75 78 75
9 69 70 76 79 78
10 69 72 78 80 79
11 70 70 76 78 77
12 71 70 74 77 76
13 71 72 77 80 79
14 68 73 82 86 87
15 67 69 75 76 76
16 72 72 78 79 81
17 72 72 77 79 80
18 71 72 77 79 79
19 68 72 78 79 77
20 72 73 78 81 81
21 71 73 79 81 81
-
Reference Evapotranspiration (ETo)
eter-based
equations or simple, empirical equations. The main
data required for the parameter-based equations (such as the
small number of parameters (usually air temperature and solar
Model Development 151
-
-
-
where,
T
T
⎛
ETh = 0. 0023Ra⎜
⎝
max
min
T + T ⎞⎛T
−T
max min max min
⎟⎜
2× 178 . ⎠⎝
2
is the maximum daily air temperature [ ° C],
is the minimum
daily air temperature [ ° C], and
Ra is the extraterrestrial
solar radiation
2
(megaJoule/m /day).
to be one of the simplest and most accurate of the empiri-
-
the center of each 1-mi 2
⎞
⎟
⎠