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RedR TSS gravatar image
RedR TSS

This is not as bad as the tsunami affected wells as there is no question of the aquifer being contaminated with salt water. The wells should be cleaned out by physically removing any debris and sludge and then dewatering using a pump. Petrol driven pumps are most widely available but a submersible pump driven off a generator is even better. Dewatering by hand using buckets is a perfectly good option if the inflow is low enough and would certainly help to avoid potential problem #1 below. Two points to watch out for are: #1. there is a risk of destabilising the walls of the well if the dewatering draws the well down too far - a lot of wells in Sri Lanka were lost permanently for this reason #2. the contaminated water from within the well should be discharged far enough away from the well that it can not seep back in

Quentin