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Hydrogeologic Framework and Simulation of Ground-Water Flow and Travel Time in the Shallow Aquifer System in the Area of Naval Support Activity Memphis, Millington, Tennessee 

    Table 10. Results of sensitivity analyses of the calibrated flow model of the shallow aquifer system in the area of Naval Support Activity Memphis, Millington, Tennessee
Parameter tested
Change in parameter
Number of 
wells with 
residual error 
greater than 
3 feet
Root mean 
square error
Calibrated model
 
2
1.82
Induced recharge rate
x 0.5
x 2.0
37
38
10.46
14.87
Transmissivity of layer 1
x 0.5
x 2.0
30
33
8.99
6.78
Natural recharge rate
x 0.5
x 2.0
36
40
5.50
8.19
Vertical conductance of layer 1
x 0.5
x 2.0
19
24
3.29
4.34
Vertical conductance of layer 2
x 0.5
x 2.0
17
31
3.23
4.51
Transmissivity of  layer 2
x 0.5
x 2.0
5
20
2.13
3.64
Riverbed conductance
x 0.5
x 2.0
5
12
2.12
2.72
General head boundary conductance terms
x 0.5
x 2.0
5
5
2.37
2.15
Specified head boundaries instead of general head boundaries
 
5
2.32
 

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