Withdrawal well to the rescue from basement seepage

A corporate office in the heart of the city got flooded in the last years rain. So much so that we could still see the water seeping in during our visit in (End of) December. The Office had basement seepage apparently since the time of construction and water had to be dewatered continuously to construct a 22 ft double basement which is a parking place and generator space.

The corporate office tried to address the problem by water proofing, however that hasn’t resolved the problem.

After observing the prominent basement seepage locations and talking to couple of well-diggers who have dug wells in the vicinity, the withdrawal well locations and depth was finalized. 2 Withdrawal wells are dug so far and has hit water at 19 ft and 20 ft depth from ground level respectively. The details of the two withdrawal wells are as below:

Diameter	6 ft
Depth	35 ft
Water struck at	19 ft
Number of rings	6 ft rings: 26 in number 4 ft rings: 11 in number 3 ft rings: 1 in number 2 ft rings: 3 in number
Pumping frequency	Pumped 4 times a day with a 2 HP pump for 20-25 minutes, yielding a quantity of 4 – 4.5 KL each time (total 16 – 18 KL per day)

Diameter	6 ft
Depth	35 ft
Water struck at	20 ft
Number of rings	6 ft rings: 31 in number 4 ft rings: 10 in number 3 ft rings: 3 in number 2 ft rings: 3 in number
Pumping frequency	Not pumped so far as well digging is still in progress