The driller almost certainly arrived at this sandy layer immediately after pinching out a hard clay layer and sand was popping out below the clay roof. Then its far better not To place the strainer and preserve it open up at the bottom in the well so that it might behave like a Cavity sort Well. Cavity can be formed during the water bearing stratum

A flushing current collects the loosened drill cuttings and conveys them upwards. this technique is mainly applied for not easy to pretty hard rock and/or for penetrating massive boulders. it's important to take into account and evaluate all doable circumstances before selecting the sort of drilling process utilized. Different techniques have diff