The water flowing in the unconfined aquifer is high quality potable water, which is collected by the percolation of the rain water and the rivers flowing on the earth surface. Whereas water flowing in the confined aquifer is saline due to solubility of the rock salt contains high concentration of iron, hydrogen sulphide or fluoride. The potable water in the unconfined aquifer goes on flowing down through the tube wells piercing impermeable layer and mixed with the saline water in the confined aquifers.
Figure-6
According to the figure 6 the bottoms of the tube well opens in the confined aquifers instead of unconfined aquifers or we can say that water is always pumping out of a tube well from saline water base. In that situation we are getting a mixture of potable water flowing downwards from unconfined to confined aquifers on the pump set and saline water. In the beginning we get suitable water; less saline for drinking purposes as well for irrigation till the supply of potable water from the upper unconfined aquifers continuous, but as soon as it finishes the concentration of the salinity increases due to the presence of mineral salt in the confined aquifers. We have made a uniform combination of water in the upper unconfined aquifers and lower confined aquifer by drilling vertical holes in the horizontal impermeable rock layer, as the consequences of it the potable water flows towards the sea by following the man made shortcut routes in the impermeable layer between the aquifers. Today we are facing the serious problem of the availability of drinking water and every creature including the human being has to drink the water highly concentrated with fluoride and other harmful rock salt which is responsible for the severe incurable physical deformities in their body.
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