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Mesilla/Conejos-Médanos Basin: U.S.-Mexico Transboundary Water Resources
Article

Assessing Groundwater Withdrawal Sustainability in the Mexican Portion of the Transboundary Santa Cruz River Aquifer

1
Departamento de Geología, Universidad de Sonora, Hermosillo 83000, Mexico
2
Hydrologic Research Center, San Diego, CA 92127, USA
3
Water Resources Research Center, The University of Arizona, Tucson, AZ 85719, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Pankaj Kumar
Water 2022, 14(2), 233; https://doi.org/10.3390/w14020233
Received: 30 September 2021 / Revised: 17 December 2021 / Accepted: 3 January 2022 / Published: 13 January 2022
(This article belongs to the Special Issue Advances in Transboundary Aquifer Assessment)
The impact of climate uncertainties is already evident in the border communities of the United States and Mexico. This semi-arid to arid border region has faced increased vulnerability to water scarcity, propelled by droughts, warming atmosphere, population growth, ecosystem sensitivity, and institutional asymmetries between the two countries. In this study, we assessed the annual water withdrawal, which is essential for maintaining long-term sustainable conditions in the Santa Cruz River Aquifer in Mexico, which is part of the U.S.–Mexico Transboundary Santa Cruz Aquifer. For this assessment, we developed a water balance model that accounts for the water fluxes into and out of the aquifer’s basin. A central component of this model is a hydrologic model that uses precipitation and evapotranspiration demand as input to simulate the streamflow into and out of the basin, natural recharge, soil moisture, and actual evapotranspiration. Based on the precipitation record for the period 1954–2020, we found that the amount of groundwater withdrawal that maintains sustainable conditions is 23.3 MCM/year. However, the record is clearly divided into two periods: a wet period, 1965–1993, in which the cumulative surplus in the basin reached ~380 MCM by 1993, and a dry period, 1994–2020, in which the cumulative surplus had been completely depleted. Looking at a balanced annual groundwater withdrawal for a moving average of 20-year intervals, we found the sustainable groundwater withdrawal to decline from a maximum of 36.4 MCM/year in 1993 to less than 8 MCM/year in 2020. This study underscores the urgency for adjusted water resources management that considers the large inter-annual climate variability in the region. View Full-Text
Keywords: Santa Cruz River Aquifer; Mexico; water balance model; climate uncertainty; transboundary aquifer; transboundary aquifer assessment; Arizona; Sonora Santa Cruz River Aquifer; Mexico; water balance model; climate uncertainty; transboundary aquifer; transboundary aquifer assessment; Arizona; Sonora
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MDPI and ACS Style

Tapia-Villaseñor, E.M.; Shamir, E.; Cruz-Ayala, M.-B.; Megdal, S.B. Assessing Groundwater Withdrawal Sustainability in the Mexican Portion of the Transboundary Santa Cruz River Aquifer. Water 2022, 14, 233. https://doi.org/10.3390/w14020233

AMA Style

Tapia-Villaseñor EM, Shamir E, Cruz-Ayala M-B, Megdal SB. Assessing Groundwater Withdrawal Sustainability in the Mexican Portion of the Transboundary Santa Cruz River Aquifer. Water. 2022; 14(2):233. https://doi.org/10.3390/w14020233

Chicago/Turabian Style

Tapia-Villaseñor, Elia M., Eylon Shamir, Mary-Belle Cruz-Ayala, and Sharon B. Megdal. 2022. "Assessing Groundwater Withdrawal Sustainability in the Mexican Portion of the Transboundary Santa Cruz River Aquifer" Water 14, no. 2: 233. https://doi.org/10.3390/w14020233

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