19. (gms) The objective of this exercise is the create a MODFLOW model of the Happy Valley site shown below. We will use a one-layer grid and assume uniform aquifer properties. The values for the sources/sinks will be given below.
Click here to download a zip archive containing a set of files associated with this project. Open the GMS project file named happy valley.gpr. Note that the project file references a background image that has been pre-registered. Use this as a base map to build your model.
Click here to download a copy of the solution.
Create and run a MODFLOW model using the conceptual model approach in GMS. As you build your model, consider the following data/instructions:
Assume that recharge and K are constant:
Recharge: 0.0008 m/d
K: 15.0 m/d
For the top and bottom elevations, import the following scatter point data contained in the following two files that are included in the zip archive you downloaded:
Import these files as scatter point sets and use them to interpolate your top and bottom elevations.
Assume the following properties for the lake:
Sediment thickness (ave): 3 m
Sediment K (ave): 0.6 m/d
Stage: 287 m
Assume the river bottom sediments have the following average characteristics:
width: 3 m
thickness: 2 m
K: 0.5 m/d
Use the following elevations:
Use the following pumping rates
Q (W1): -1000 m^3/d
Q (W2): -1500 m^3/d
Rotate your grid so that the major axis (x-axis) is aligned with the main river channel (roughly southwest to northeast). Use 90 cells in X and 60 cells in Y.
Build your model and make sure you have a reasonable looking solution. Your solution will be graded as follows:
a. Conceptual model and coverage setup/organization (2 pts)
b. Computational grid (dimensions, location, etc.) (2 pts)
c. Recharge and K (2 pts)
d. Grid elevations (top, bottom, starting head) (5 pts)
e. Representation of lake (6 pts)
f. Representation of river (8 pts)
g. Wells (3 pts)
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