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There is overexploitation in Recife (PE)?

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Jonathan Carvalhaes Batista
Total Authors: 1
Document type: Master's Dissertation
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Instituto de Geociências
Defense date:
Examining board members:
Ricardo Hirata
Advisor: Ricardo Cesar Aoki Hirata

Groundwater overexploitation are been used in scientific literature and media in an unrestrained way. Nevertheless there are no technical definition of this term, usually this expression are used when the negative aspects of groundwater exploitation are perceived by stakeholders. Despite his technical indetermination the term puts groundwater exploitation in evidence, creating more awareness for the situation. Then the usage can be justified since those limitations are taken into account. Before careful analysis of pumping effects is possible to outline six aspects of overexploitation: (1) hydraulic, related to aquifer exhaustion; (2) water quality, decline of water quality to unacceptable levels; (3) economic, increase of pumping costs to an level in which others sources of water are more suitable; (4) ecologic, related to loss of base flow in rivers and others superficial water bodies and extinction of aquifer dependent flora and fauna; (5) loss of land stability due to water withdrawal; (6) ethic and social, related to unequal distribution of water resources. In this scenario, Recife is a typical example of partial groundwater supplied city, in Recife there was a very fast increase of wells, uncontrolled pumping, marked water level drawdown and decrease of water quality in some spots. Therefore in the last years all studies in characterized the area as overexploitated. This study analyzed the exploitation regime in Cabo Aquifer, in Recife, in face of the previous cited six aspects os overexploitation. For this purpose, were historical chemical analysis and water level logging were used, furthermore two sampling campaigns and one geophysical campaign were done. With these methods were not possible to characterize an overploitation scenario. However, were possible to delineate and area in which groundwater depreciation might be happening, nonetheless this depreciation are not related to groundwater pumping. Concerning the economic aspect the extra costs due to drawdown was estimated, notwithstanding, even with extra costs, groundwater exploitation where much more advantageous than water from public supply. Regarding the ethical aspect were shown that Cabo Aquifer users has high economic power, therefore any of those users are hindered to aquifer access. As management strategy was purposed that groundwater permission would be only gave to users who are involved in well monitoring programs, such monitoring data would be used to feed an flux model. In this way, this model could be an managing tool and also foresee future scenarios. (AU)

FAPESP's process: 12/12506-3 - Origin of metropolitan aquifer salinization in Recife
Grantee:Jonathan Carvalhaes Batista
Support type: Scholarships in Brazil - Master