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Evaluation of the surface waters of the Claromeco River basin for supplementary irrigation

María Elizabeth Carbone, María Cintia Piccolo and Gerardo Miguel Eduardo Perillo
Revista Geográfica
No. 137 (ENERO-JUNIO 2005), pp. 81-100
Stable URL: http://www.jstor.org/stable/40996700
Page Count: 20
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Evaluation of the surface waters of the Claromeco River basin for supplementary irrigation
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Abstract

The water quality of the superficial courses of the Claromeco River basin, located in the southeast of Buenos Aires Province, Argentina, was evaluated with the purpose of their possible employment for irrigation. Based on the results of electric conductivity and SAR (Sodium-adsorption-ratio), different sectors of the basin with similar water quality have been identified. The three courses that form the Claromeco River have good quality water for irrigation and can be used for the majority of crops. The four basic criteria for evaluating water quality were: a) total soluble salt content (salinity hazard); b) relative proportion of sodium cations (Na⁺) to other cations (sodium hazard), c) carbonate (CO₃²⁻) and bicarbonate (HCO³⁻) anion concentration as related to calcium (Ca²⁺) plus magnesium (Mg²⁺) concentration, and d) concentration of a toxic element (boron). The electric conductivity (ECW) in the courses of the basin varies between 0.57 and 1.41 dS m⁻¹, and the maximun values of SAR are less than 10.4. The courses of the middle basin have lower water quality for irrigation, but allow irrigation of the main crops of the area such as Zea mays, Triticum , Helianthus annus, Glycine max, Sorghum and Medicago sativa. En el presente trabajo se evalúa la calidad de agua para riego de los cursos superficiales de la cuenca hídrica del Arroyo Claromecó, localizado en el sudeste de la provincia de Buenos Aires, Argentina. De acuerdo a los resultados obtenidos en base a la conductividad eléctrica y la RAS (Relación de Adsorción de Sodio), se identificaron diversos sectores de la cuenca con similares condiciones de riego. Los tres cursos de agua que conforman el Arroyo Claromecó poseen buena calidad de agua para riego y pueden ser utilizados para la mayoría de los cultivos. Los criterios aplicados para la evaluación de las aguas de la cuenca son los siguientes: a) Contenido total de sales; b) Relación de adsorción de sodio c) Concentración de carbonato, calcio (Ca²⁺) y magnesio (Mg²⁺) y d) Concentración de elementos tóxicos como el Boro. La conductividad elétrica (ECw) hallada en los cursos de la cuenca oscila entre 0.57 y 1.41 dS m⁻¹, el máximo valor obtenidos de RAS no supera los 10.4. Las aguas de la cuenca media del Arroyo son las más apropiadas para riego. Los cultivos que pueden ser irrigados son los siguientes: maíz (Zea mays), trigo (Triticum), girasol (Helianthus annus), soja (Glycine max), sorgo (Sorghum) y alfalfa (Medicago sativa).

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