$1.$ A $0\mathrm{.}6$ m well is constructed in a confined aquifer of $20$ meters thickness.$$ Assume the aquifer to be composed of$$ a mixture of sand and gravel.$$ The upper confining impermeable layer extends from the top of the aquifer to the ground surface and has a thickness of $40$ meters.$$ The original piezometeric surface is $10$ m below the ground surface.$$ Pumping has stabilized at the following drawdowns:$2\mathrm{.}5$ m at the observation well $25$ m away from the pumped well and $4\mathrm{.}0$ m at the observation well $3$ meters from the pumped well.$$ Calculate the discharge rate Qw$.$