Curva de permanência de nascentes da Microbacia Hidrográfica do Arroio Encantado - Cerro Largo/RS

Abstract

The lack of the hydrological data in hydrographic micro basins makes the management of water resources difficult and limits its uses by the population. Thus, there is a need to apply methods that make it possible to obtain information through data and its quantification for decision making. In view of this, Silveira (1997), developed an alternative methodology applied mainly to small hydrographic basins, which allows the creating of a reliable permanence curve. Thus, the present study proposed the application of the method developed by Silveira (1997) to obtain historical flows data and thus enable the construction of permanence curves for three springs of the Arroio Encantado Hydrographic Micro basin, in the city of Cerro Largo-RS. For this, three measurements of the flow of each spring were carried out, for the application of the method, and, subsequently, the permanence curves of these springs were constructed. The 90% and 95% permanence flows are widely used for the purpose of granting the right to use water resources. In this study the values found for the Q90% and Q95% were 0.42 m³/s and 0.25 m³/ s, respectively for the spring 1; 0.00098 m³/s and 0.00048 m³/s, for the spring 2 and 2.73-8 m³/s and 3.93-10 m³/s for the spring 3. Also, the results showed that Kb calculated values were: 0.5; 5.80 and 0.87 for springs 1, 2 and 3 respectively and the value of the Cinf parameter was 0.5 for spring 1 and 0.99 for springs 2 and 3. This work concludes that Silveira's (1997) method is a simple and fast methodology for providing hydrological data. In addition, this study contributed to the generation of previously non-existent data in the micro basins, collaborating for the correct management of the water of the Arroio Encantado.