What Reasons that create bores?
Answers
Here's your answer!!
Rock layers at great depths are usually less permeable, and cannot soak up water. Thus water stays trapped in cracks, surrounded by rocks under pressure. When a borewell is dug, such water-bearing cracks are struck are various depths, and water juts out at high pressure into the borehole. This causes a sudden rise in water level in the borehole. The level gets stabilised over time; this stable level is called the static water level of the borewell. As the depth increases, the rock becomes even less permeable and the number of cracks decrease reducing the chance of finding water.
Borewells usually have casings, to prevent the borehole from collapsing. The casing pipe is made of galvanised iron or PVC, and part of it would be visible above the ground. It is installed till the depth at which hard rock layer starts, and is usually 4, 6, 12 or 24 inches in diameter. Diameter of the casing pipe would be half inch lesser than that of the borewell.
A “submersible pump” of appropriate power rating is inserted into the borehole, typically below the lowest crack from which water has jutted out into the borehole. This pump has a “delivery pipe” attached which comes up all the way up to the surface. The pump delivers the water from this pipe, which is collected by the borewell users.
HOPE IT HELPS!!
❤❤❤❤❤❤❤