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Since the time period fits the main industrial growth of the area it could be over-extraction or mining causing the lowering of the water table.
Increased use of water by a growing population can deplete the underground aquifer and lower the water table faster than it can be naturally replenished.Extended drought over the recharge zone can prevent an aquifer from replenishing its water supply.
the reasons are : 1)over population-increase in population has caused an increase in the amount of water used in agricultural fields, industries and domestic uses 2)sewage- the improper channelising of sewage water also results in an increase in polluted water that cannot be used anymore and so it is also like depletion
The water table is the term for how deep underground you have to dig to find ground water.
the cone of depression
the cone of depression
the cone of depression
the water table
Wells get water from the underground water table.
Rainwater from thunderstorms can make its way underground and raise the water table.
Percolation
Water table