A monitoring well on the grounds of the factory shows the elevation of the water

Question

A monitoring well on the grounds of the factory shows the elevation of the water table where the contaminant was spilled is 275 feet. Approximately 1.8 milles down 9rad,ent from the factory is a housing community. Monitoring wells at the housing community show the water table to be at an elevation of 154 feet. The sediment is a silty sand, and the hydraulic conductivity was determined to be 28.34 ft/day. What is the velocity of the groundwater (ft/day) in the surficial aquifer between the factory and the housing community. Use the porosity values from above. Show all your work. velocity = hydraulic conductivity/porosity Times hydraulic gradient hydraulic gradient = difference in head between two points/Distance those two points How many years before the contaminant reaches the housing community? Show all your work.

Explanation / Answer

b. hydraulic gradient = 121ft/9504ft

velocity = (28.34 ft/day * 121ft/9504ft) / 0.5 = 0.72162 ft/day

3. time taken to reach housing community = 9504/0.72162 days = 13170.36 days = 36.08 years

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