Question

2) For a typical sand and gravel aquifer, estimate the one-year travel distance for water when the hydraulic gradient is 0.0004 m/m.

3)You are interested in the travel time for benzene that has contaminated an aquifer due to its leaking from an underground storage tank at a gasoline station. Here is what you know. The aquifer is sandy, the water table drops by 0.2 m over a horizontal distance of 600 m in the direction of groundwater flow, and benzene has a retardation factor of 4. How long will it take the water and the benzene to travel 600m? (two answers)