This work presents a synthesis on the hydrogeology of the region of the
municipality of Abaetetuba and a proposal for alternative water supply for the local population
for the next 15 years. To this end, a set of hydrogeological data is used, involving a register
of wells, hydrogeochemical data, geometric aspects of aquifer layers, available underground
water reserves in the area and economic evaluation of the supply proposal, with the objective
of determining potential and the characteristics of the area's underground water resources.
Five (5) hydrogeological systems were identified in the Abaetetuba region: Alluvies, post-
Barreiras, Barreiras, Pirabas Superior and Pirabas Inferior, geometric aspects were studied
through profiles and lithological divisions. As underground water reserves calculated for
elevated aquifer systems there are 25,88 billion cubic meters of groundwater in the area, of
which 25,66 billion are permanent reserves and about 223,2 million cubic meters are
renewable. The proposal for the supply of drinking water to the municipality of Abaetetuba
will supply approximately 39.600 m3 of drinking water to meet the demand of the population.
Therefore, the construction of 11 wells in the Pirabas aquifer is necessary, with depths
around 200m, a total cost, including the pumping system, of R $ 3.805.229,12. This value
corresponds to a price per capita of R $ 19.01, considering an estimated population for 15
years from now (200.123 inhabitants) which is the useful life of a tubular well. Desiring only
the current population (159.080 inhabitants), the price per capita of the work would be R $
23,92. The economic evaluation shows that the final cost of the local water metro is around
R $ 0,25 / m3.
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