An unconfined, gravel-sand aquifer has a porosity of 0.23, and a hydraulic conductivity of 1000 m/day. Two monitoring wells are 260 m apart, and the difference in their water levels is 0.3 m.
What is the Darcy velocity of the groundwater?
What is the average linear velocity of the groundwater?
How long would it take the groundwater to travel from one well to another?
How long would it take the hydrophobic contaminant trichloroethene (TCE), which has a retardation factor of 3, to travel between the wells?