Data Analysis to Evaluate the Influence of Drought on Water Quality in the Colorado River Basin

Droughts negatively affect basins by reducing the river streamflow and increasing ion concentrations due to lower dilution. This study examines the impact of droughts in the Colorado River basin in Argentina. For this purpose, data were collected during the period from 2015 to 2021 at eight monitori...

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Veröffentlicht in:Water (Basel) 2024-10, Vol.16 (19), p.2750
Hauptverfasser: Vallese, Federico Danilo, Trillini, Mariano, Dunel Guerra, Luciana, Pistonesi, Marcelo Fabian, Pierini, Jorge Omar
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container_issue 19
container_start_page 2750
container_title Water (Basel)
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creator Vallese, Federico Danilo
Trillini, Mariano
Dunel Guerra, Luciana
Pistonesi, Marcelo Fabian
Pierini, Jorge Omar
description Droughts negatively affect basins by reducing the river streamflow and increasing ion concentrations due to lower dilution. This study examines the impact of droughts in the Colorado River basin in Argentina. For this purpose, data were collected during the period from 2015 to 2021 at eight monitoring stations containing water from the river and drainage canals. The Standardized Precipitation Index (SPI) was used to analyze droughts from 1966 to 2020, and the Mann–Kendall test was used to evaluate the precipitation trends. In addition, water quality indices for human consumption (DWQI) and livestock (LWQI) were calculated by evaluating physicochemical parameters. The results show an intensification of drought since 2007, with an SPI of −1.5 in 2008, which affected the river streamflow regime and reduced the dilution capacity in the Casa de Piedra Dam. This reduction led to the deterioration of the water quality, with DWQI values indicating that 85% of the samples were not suitable for human consumption but were suitable for livestock consumption. In the drainage canals, most of the samples were of low quality for livestock consumption. The physicochemical analyses show that although some parameters (Na+, K+, CO32− + HCO3−, and Cl−) were at acceptable levels, others (electrical conductivity, SO42−, and Ca2+) exceeded the WHO’s limits, representing risks to human and livestock health. This study provides insights into how droughts and streamflow regulation affect the water quality in semiarid basins and highlights the broader applicability to other regions that present similar challenges under climate change scenarios.
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In the drainage canals, most of the samples were of low quality for livestock consumption. The physicochemical analyses show that although some parameters (Na+, K+, CO32− + HCO3−, and Cl−) were at acceptable levels, others (electrical conductivity, SO42−, and Ca2+) exceeded the WHO’s limits, representing risks to human and livestock health. 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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute
subjects Analysis
Argentina
Climate change
Climatic changes
Consumption
Dams
Drought
Droughts
Floods
Hydrology
Irrigation
Livestock
Precipitation
Public health
Rain
Rivers
Streamflow
Surface water
Water
Water quality
Water shortages
title Data Analysis to Evaluate the Influence of Drought on Water Quality in the Colorado River Basin
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