In the figure, h1-h2=1ft and h1-h3=2.5ft. If the length of the soil sample is 2 ft, it’s crosssectional area 0.3 ft2 and the water flow is 3 in3/min, what is the permeability of the soil:

Geotechnical engineering, also known as geotechnics, is the branch of civil engineering concerned with the engineering behavior of earth materials. It uses the principles of soil mechanics and rock mechanics for the solution of its respective engineering problems. (Source: Wikipedia)