Nomographs for the Rapid Analysis of Aquifer Tests

THE coefficients of transmissibility and storage are two important aquifer characteristics determined during many ground water investigations. The coefficient of transmissibility indicates the ability of an aquifer to transmit water ; in US Geological Survey usage, it is expressed as the rate of flow of water (in gallons per day) through a vertical strip of aquifer, 1 ft wide and extending the full saturated height, under a hydraulic gradient of 160 per cent at the prevailing temperature of the water. The coefficient of storage is the amount of water released from