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Transcription
14. it is satisfactory to fill the space with a good clay mud introduced through a pipe to the bottom of the casing in the same manner as when * walls are cemented. The life of a well depends to a very large extent upon the casing and sould and water-tight connections. Accordingly only casing of the best grade should be used, iffells that penetrate several of the artesian water-bearing sands allo'w water from the deeper sands that are under higher pressure to flow up through the well and out into sands in which the artesian water pressure is lower. Other wells allow artesian water to flow upward in the well and out into shallow beds of sand and gravel. The first instance is not strictly a waste of artesian water because the water so lost recharges other artesian sands and probably may be recovered by wells yielding water from those sands, but this exchange of water results in a loss of artesian water pressure from the lower sand. An example of such exchange of water between sands was found in well 12, drilled during August and September 1938 for Mr. Thabo. This well
