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HP2 - Special Studies

PURPOSE DRIVEN STUDY
                Puducherry region is situated on the Coramandal Coast, covering an area of 293 Sq.KM.  The main source of water supply for all purposes such as agriculture, drinking, domestic is groundwater, which is extracted from 3 major aquifers viz., Alluvium, Tertiary and Cretaceous and irrigation is supplemented by 84 Nos. of System and non-system tanks. Owing to the population growth, intensive agriculture and rapid phase of industrial development the demand for water has increased considerably which resulted in over exploitation of ground water, which ultimately lead to drastic depletion in groundwater levels and deterioration of water quality due to upward movement of chemical constituents present in deep seated aquifer.

                The worst affected area is the Northern part of Puducherry region where the potential aquifer (Vanur sandastone) is cretaceous aquifer. The presence of very thick and very hard arenaceous  limestone formation over the creataceous aquifer prevents the recharge in that area and affects the replenishment of groundwater potential in that area.  The Piezometric pressure head of the cretaceous aquifer was in the range of 15 to 20 mts during 1980 to 1990 and the present pressure head at present is around 30 to 65 mts.

                A “ Study to improve the ground water potential of drastically affected deep seat cretaceous aquifer (Vanur standstone) in Northern parts of Puducherry region through appropriate recharge techniques” is therefore proposed to be conducted in the North western part of Puducherry region of an estimated cost of Rs.97.45 lakhs for a period of 3 years, under HP-II.
                Under the study, it is proposed to pierce the hard limestone formation and facilitate the recharge of the deeper cretaceous aquifers artificially through appropriate recharge techniques.  Through the conduct of study, it is proposed to improve the potential of groundwater as well as the quality of groundwater in that area.

                By the implementation of this study, the continuous depletion of water level in the Northern parts of the region is expected to be halted.  The groundwater potential in the area is to be improved consequently.  The cost of extraction of groundwater by the farming community is expected to be reduced cost of construction of tubewells and lower horse powered submersible pumpsets.  In the long run, the sustainability of drinking water supply will also be maintained in that area.