A 45 cm diametre well penetrates an unconfined aquifer of 30 m thick. Under the
steady pumping rate for a long time, the drawdown’s at two observation
wells 10 m and 20 m from the pumping well are 5 m and 3.5 m respectively. What will be the
discharge (cubic metre), if the permeability of the aquifer is given as 20
m/day?

A

0.05

B

0.067

C

0.08

D

1.12