The model simulates a pumping test in glaciofluvial valley fill near a river. In the pumping test, the discharge rate of the well was 0.963 cubic feet per second for 36 hours. The initial estimates of aquifer transmissivity varied from 1.15 ft2/s to 1.45 ft2/s. In the original model, the aquifer was treated as confined and the same approach will be used here. Some other characteristics of the model are given in the table below.
Grid Spacing: |
Uniform 100 ft. |
Initial Head: |
0.0 ft. |
Transmissivity: |
Non-uniform spatially, 3 zones |
Storage Coefficient: |
Uniform spatially |
Closure Criterion: |
0.001 ft. |
Number of Time Steps: |
10 |
The Step Multiplier: |
1.414 |
Length of Simulation: |
36 hours |
Pumping Rate: |
0.963 ft3/s (432 gpm) |
River Stage: |
0 |
River Conductance: |
0.02 ft2/s |
River Bottom Elevation: |
-l0 ft. |
There were three observation wells. The observed drawdowns in the wells are shown in the table below. They are also included in a spreadsheet included with ModelMuse.
Time |
Drawdown (ft) |
|||
(min) |
(sec) |
Well 1 |
Well 2 |
Well 3 |
1 |
60 |
0.17 |
0.04 |
0 |
4 |
240 |
0.26 |
0.12 |
0.01 |
10 |
600 |
0.33 |
0.16 |
0.02 |
40 |
2400 |
0.48 |
0.22 |
0.08 |
100 |
6000 |
0.57 |
0.29 |
0.14 |
400 |
24000 |
0.79 |
0.51 |
0.3 |
1000 |
60000 |
0.99 |
0.7 |
0.5 |
2000 |
120000 |
1.19 |
0.86 |
0.68 |
3000 |
180000 |
1.33 |
0.98 |
0.78 |
