difference between perinial lined wells and unperinial lined wells
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. Introduction
The middle section of the well is the first part to be built. It involves digging and lining the hole from the ground surface to the water table.
B. Lining: Purposes
The lining is a circular wall made of a strong, permanent material placed or built adjacent to the walls of the hole.
The lining has three purposes:
it retains the walls after completion; it keeps the hole from caving in;
it acts as a seal to prevent polluted surface water from entering the well;
it serves as foundation and support for the well top.
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