GATE Civil Engineering (CE) 2010 Solved Paper

A wall of diameter 20 cm fully penetrates a confined aquifer. After a long period of pumping at a rate of 2720 litres per minute, the observations of drawdown taken at 10 m and 100 m distances from the center of the wall are found to be 3 m and 0.5 m respectively. The transmissivity of the aquifer is