A field permeability test is performed by measuring the quantity of water necessary to keep a boring casing (pipe) filled. The distance from the top of the casing to the bottom (in the ground) is 10...

A field permeability test is performed by measuring the quantity of water necessary to keep a boring casing (pipe) filled. The distance from the top of the casing to the bottom (in the ground) is 10 ft. The groundwater table is below the bottom of the casing. The casing has an inside diameter of 6 in. In a 10-minute period, 1 gallon of water was used to keep the casing filled. What is the coefficient of permeability for the soil at the bottom of the casing?