Water Supply Source Evaluation in Unmanaged Aquifer Recharge Zones: The Mezquital Valley (Mexico) Case Study

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Hernández-Espriú, Antonio and Arango-Galván, Claudia and Reyes-Pimentel, Alfonso and Martínez Santos, Pedro and Pita de la Paz, Carlos and Macías-Medrano, Sergio and Arias-Paz, Alberto and Breña-Naranjo, José (2016) Water Supply Source Evaluation in Unmanaged Aquifer Recharge Zones: The Mezquital Valley (Mexico) Case Study. Water, 9 (1). p. 4. ISSN 2073-4441

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Official URL: https://doi.org/10.3390/w9010004




Abstract

The Mezquital Valley (MV) hosts the largest unmanaged aquifer recharge scheme in the world. The metropolitan area of Mexico City discharges ~60 m3/s of raw wastewater into the valley, a substantial share of which infiltrates into the regional aquifer. In this work, we aim to develop a comprehensive approach, adapted from oil and gas reservoir modeling frameworks, to assess water supply sources located downgradient from unmanaged aquifer recharge zones. The methodology is demonstrated through its application to the Mezquital Valley region. Geological, geoelectrical, petrophysical and hydraulic information is combined into a 3D subsurface model and used to evaluate downgradient supply sources. Although hydrogeochemical variables are yet to be assessed, outcomes suggest that the newly-found groundwater sources may provide a long-term solution for water supply. Piezometric analyses based on 25-year records suggest that the MV is close to steady-state conditions. Thus, unmanaged recharge seems to have been regulating the groundwater balance for the last decades. The transition from unmanaged to managed recharge is expected to provide benefits to the MV inhabitants. It will also be likely to generate new uncertainties in relation to aquifer dynamics and downgradient systems.


Item Type:Article
Uncontrolled Keywords:Aquifer; groundwater exploration; water supply; well logs; geophysical prospection; TDEM; pumping test; unmanaged recharge; wastewater irrigation; Mezquital Valley
Subjects:Sciences > Geology > Geodynamics
Sciences > Geology > Hidrology
ID Code:62813
Deposited On:03 Nov 2020 08:26
Last Modified:03 Nov 2020 09:03

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