Central Valley Aquifer, Chapters A and B - MAE Class Websites
Central Valley Aquifer, Chapters A and B - MAE Class Websites Central Valley Aquifer, Chapters A and B - MAE Class Websites
168 Groundwater Availability of the Central Valley Aquifer, California A Water-level difference, in feet, simulated minus estimated (Williamson and others, 1989)— Equal to or less than -50.0 -49.9 to -25.0 -24.9 to 0.0 0.1 to 24.9 25.0 to 49.9 Equal to or greater than 50.0 0 50 100 Miles 0 50 100 Kilometers Shaded relief derived from U.S. Geological Survey National Elevation Dataset, 2006. Albers Equal Area Conic Projection Simulated water-level altitude, in feet. Spring, 1976— Model streams and canals EXPLANATION Active model grid boundary Model water-balance subregion Figure C18. The simulated A, Water-table altitude in spring 1976. B, Potentiometric-surface altitude in spring 1976, for the calibrated transient groundwater-flow model of the Central Valley. Residuals at observation points and areal differences between hand-drawn altitude maps also are shown. Maps showing the simulated water-table altitude and potentiometric-surface altitude in spring of 2000 are shown in and . -160 -120 -80 -40 0 40 80 120 160 200 240 280 320 360 400 440 480 Residual (Observed minus Simulated), in feet— -57.3 to -55 -54.9 to -50 -49.9 to -45 -44.9 to -40 -39.9 to -35 -34.9 to -30 -29.9 to -25 -24.9 to -20 -19.9 to -15 -14.9 to -10 -9.9 to -5 -4.9 to 5 5.1 to 10 10.1 to 15 15.1 to 20 20.1 to 25 25.1 to 30 30.1 to 35 35.1 to 40 40.1 to 45 45.1 to 50 50.1 to 55 55.1 to 60
B Potentiometric-surface difference, in feet, simulated minus estimated (Williamson and others, 1989)— 0 50 100 Miles 0 50 100 Kilometers Shaded relief derived from U.S. Geological Survey National Elevation Dataset, 2006. Albers Equal Area Conic Projection Figure C18. Continued. Equal to or less than -50.0 -49.9 to -25.0 -24.9 to 0.0 0.1 to 24.9 25.0 to 49.9 Equal to or greater than 50.0 Model Calibration and Sensitivity 169 Model streams and canals EXPLANATION Simulated potentiometric-surface altitude, in feet. Spring, 1976— -160 -120 -80 -40 0 40 80 120 160 200 240 280 320 360 400 440 480 Active model grid boundary Model water-balance subregion Residual (Observed minus Simulated), in feet— -57.3 to -55 -54.9 to -50 -49.9 to -45 -44.9 to -40 -39.9 to -35 -34.9 to -30 -29.9 to -25 -24.9 to -20 -19.9 to -15 -14.9 to -10 -9.9 to -5 -4.9 to 5 5.1 to 10 10.1 to 15 15.1 to 20 20.1 to 25 25.1 to 30 30.1 to 35 35.1 to 40 40.1 to 45 45.1 to 50 50.1 to 55 55.1 to 60
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B<br />
Potentiometric-surface difference, in feet,<br />
simulated minus estimated (Williamson<br />
<strong>and</strong> others, 1989)—<br />
0 50 100 Miles<br />
0 50 100 Kilometers<br />
Shaded relief derived from U.S. Geological Survey<br />
National Elevation Dataset, 2006. Albers Equal Area Conic Projection<br />
Figure C18. Continued.<br />
Equal to or less than -50.0<br />
-49.9 to -25.0<br />
-24.9 to 0.0<br />
0.1 to 24.9<br />
25.0 to 49.9<br />
Equal to or greater than 50.0<br />
Model Calibration <strong>and</strong> Sensitivity 169<br />
Model streams<br />
<strong>and</strong> canals<br />
EXPLANATION<br />
Simulated potentiometric-surface<br />
altitude, in feet. Spring, 1976—<br />
-160<br />
-120<br />
-80<br />
-40<br />
0<br />
40<br />
80<br />
120<br />
160<br />
200<br />
240<br />
280<br />
320<br />
360<br />
400<br />
440<br />
480<br />
Active model grid<br />
boundary<br />
Model water-balance<br />
subregion<br />
Residual (Observed minus<br />
Simulated), in feet—<br />
-57.3 to -55<br />
-54.9 to -50<br />
-49.9 to -45<br />
-44.9 to -40<br />
-39.9 to -35<br />
-34.9 to -30<br />
-29.9 to -25<br />
-24.9 to -20<br />
-19.9 to -15<br />
-14.9 to -10<br />
-9.9 to -5<br />
-4.9 to 5<br />
5.1 to 10<br />
10.1 to 15<br />
15.1 to 20<br />
20.1 to 25<br />
25.1 to 30<br />
30.1 to 35<br />
35.1 to 40<br />
40.1 to 45<br />
45.1 to 50<br />
50.1 to 55<br />
55.1 to 60
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