El crecimiento de la comarca serrana a la vera del río Sauce Grande representa un desafío frente al abastecimiento poblacional de agua y el desarrollo económico. Los objetivos fueron evaluar algunas características del agua superficial para consumo humano y cría de peces en tres sitios del cauce principal y describir la variación estacional entre ellos. Se registraron, entre febrero y diciembre de 2015, temperatura del agua, pH, oxígeno disuelto (OD), turbiedad y sólidos disueltos totales (TDS) en E1, E2, E3 (nombrados hacia la naciente), y lecturas limnigráficas en E1 y E2, determinándose caudales. La temperatura del agua varió entre 6,7 y 22,5 ºC, resultando similar en los sitios muestreados, excepto en primavera de 2015 donde se registraron valores inferiores en E1. El pH se halló entre 6,2 y 7,2 y resultó E1> E2 y E3 en primavera y verano. El OD se halló entre 8,7 y 13,5 mg/L, aumentando en los tres sitios desde el período estival al invernal, y a la inversa. Los valores de TDS y turbiedad se hallaron en rangos de 113-346 mg/L y para NTU de 4,2-52,3. Para ambos resultó E1> E2 y E3, excepto turbiedad en febrero de 2015. Se obsevaron en E1 y E3, crecidas en febrero de 2015, con aumento pronunciado de turbiedad y marcada disminución de TDS y OD en E3, y agosto de 2015, donde no se observaron variaciones significativas de turbiedad y TDS. En septiembre de 2015 se observó en E1 aumento de turbiedad, disminución de TDS y mínimo pH en coincidencia con una crecida. No hubo diferencias significativas entre E2 (hoya) y E3 (vado). Los parámetros fisicoquímicos muestreados resultaron adecuados para la supervivencia de la vida acuática. Se requieren estudios costo-eficiencia para tratamiento de la turbiedad para consumo humano. Se recomienda continuar monitoreando E1 y E3 e incorporar nuevos sitios y parámetros de muestreo. Abstract The mountainous tourist region growth at Sauce Grande riverside represents a challenge to human water supply and the economic development. The aims of this study were to evaluate some characteristics of surface water for human consumption and fish farming at three sites in the main course, and to describe the seasonal variation between them. From February to December 2015 were recorded water temperature, pH, dissolved oxygen (DO), turbidity and total dissolved solids (TDS) at E1, E2 and E3 (towards the source of the river). In E1 and E2 were made limnigraphic readings and flow measurement. Water temperature ranged between 6,7 and 22,5 ºC, resulting similar at studied sites, except in spring 2015 where lower values were recorded at E1. Levels of pH were between 6,2 and 7,2 and were higher at E1 with respect to E2 and E3 in spring and summer. DO concentration was between 8,7-13,5 mg/L, increasing its values in all three sites from summer to winter period, and backward. TDS and turbidity values were found between 113-346 mg/L and 4,2-52,3 for NTU. For both parameters resulted E1> E2 and E3, except turbidity in February 2015. There were observed floods at E1 and E3 in February 2015 with pronounced increasing of turbidity and significant decrease in TDS and DO at E3, and in August 2015, when no significant variations of turbidity or TDS were observed. Increase in turbidity, decrease in TDS and minimum pH at E1 was observed in September 2015 matching with a flood. There were no significant variations between E2 (pond) and E3 (ford). The observed physicochemical parameters resulted suitable for aquatic life survival. Cost-efficiency studies are necessary for treatment of turbidity of water for human consumption. It is recommended to continue monitoring E1 and E3 and incorporate new stations and sampling parameters.
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