Objectives: To explore the relationship between discharge (Q), specific discharge (q), and average linear velocity (v) in homogenous aquifers.

1. The following problem is based on water flow through two
Darcy columns. The first column is
filled with a gravel that has a hydraulic conductivity of 10^{1}
cm/sec, and the second is filled with silty sand with a hydraulic conductivity
of 10^{-3} cm/sec. The
equipotential lines are shown on the top of the models represented as dashed
lines with their associated hydraulic heads.
Note that each column has a different distribution of equipotential
lines. The total length of the columns are 45 cm and a scale bare is shown
lower right corner of the back panel of the model. Using these models please answer the
following questions.

A. Based on the two Darcy’s columns provided quantify the
difference in groundwater discharge [cm^{3}/sec] between the Gravel
column and the Silty Sand column.

B. Assuming the gravel column has an effective porosity of 0.30 and the silty sand column has an effective porosity of 0.25. Determine which column has a higher average linear velocity and by how much.

C. Explain which of the following column would make a better aquifer.

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