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

Water-
balance
subregion
Model Development 153
Table C7. Average reference evapotranspiration (ETo) by month for the Central Valley, California, for 1961–2003 based on temperature
data using the Hargreaves–Samani equation.
January February March April May June
1 1.13 1.79 2.43 3.68 5.00 6.32
2 1.24 1.93 2.61 3.91 5.15 6.32
3 1.39 2.15 2.91 4.22 5.34 6.55
4 1.36 2.18 2.92 4.22 5.35 6.58
5 1.28 2.08 2.81 4.14 5.32 6.54
6 1.28 2.14 2.77 4.06 5.19 6.34
7 1.15 1.96 2.65 4.00 5.24 6.45
8 1.29 2.14 2.84 4.04 5.17 6.22
9 1.24 2.09 2.79 4.01 4.98 5.94
10 1.63 2.33 3.11 4.16 5.26 6.40
11 1.53 2.43 3.16 4.24 5.35 6.44
12 1.53 2.37 3.16 4.28 5.37 6.48
13 1.75 2.54 3.29 4.39 5.57 6.72
14 1.72 2.40 3.18 4.33 5.43 6.57
15 1.61 2.32 3.15 4.39 5.51 6.60
16 1.70 2.50 3.30 4.49 5.76 6.99
17 1.70 2.51 3.30 4.52 5.72 6.79
18 1.90 2.70 3.46 4.64 5.77 6.80
19 2.10 2.62 3.33 4.38 5.38 6.48
20 2.21 2.73 3.41 4.34 5.38 6.53
21 2.28 2.70 3.31 4.19 5.13 6.24
Water-
balance
subregion
July August September October November December
1 6.79 5.98 4.71 2.62 1.34 0.91
2 6.69 5.96 4.75 2.79 1.51 1.06
3 6.97 6.23 4.98 3.02 1.78 1.35
4 7.14 6.36 5.05 3.06 1.79 1.40
5 6.92 6.15 4.86 2.94 1.68 1.18
6 6.52 5.89 4.80 2.96 1.74 1.14
7 6.74 6.00 4.76 2.82 1.60 0.98
8 6.53 5.82 4.69 2.94 1.80 1.25
9 6.09 5.45 4.54 2.88 1.75 1.10
10 6.65 5.87 4.89 3.15 1.96 1.41
11 6.93 6.16 4.99 3.20 2.10 1.72
12 6.77 6.02 4.92 3.18 2.01 1.48
13 7.16 6.40 5.30 3.46 2.20 1.73
14 6.67 5.91 4.86 3.26 2.03 1.52
15 6.74 6.04 4.93 3.34 2.05 1.42
16 7.36 6.65 5.32 3.47 2.23 1.73
17 7.20 6.61 5.23 3.51 2.26 1.76
18 7.11 6.52 5.30 3.60 2.38 1.93
19 6.58 5.99 4.98 3.40 2.24 1.83
20 6.63 6.02 5.02 3.38 2.29 1.95
21 6.33 5.76 4.88 3.32 2.28 1.96
-
-
used to satisfy the residual demand.