Awell is pumped at q = 300 m3 /hr in a confined aquifer. the aquifer transmissivity is 25 m2 /hr and the storage coefficient is 2.5x10-4 . calculate the drawdown at a distance 200 m from the well after pumping for (1) 50 hr, (2) 200 hr.

(a). The draw-down at a distance 200 m from the well after pumping for 50 hr is 5.383 m.

(b). The draw-down at a distance 200 m from the well after pumping for 50 hr is 6.707 m.

Explanation:

Given that,

Energy

Transmissivity

Storage coefficient

Distance r= 200 m

We need to calculate the draw-down at a distance 200 m from the well after pumping for 50 hr

Using formula of draw-down

Put the value into the formula

We need to calculate the draw-down at a distance 200 m from the well after pumping for 200 hr

Using formula of draw-down

Put the value into the formula

Hence, (a). The draw-down at a distance 200 m from the well after pumping for 50 hr is 5.383 m.

(b). The draw-down at a distance 200 m from the well after pumping for 200 hr is 6.707 m.

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