PROCESSOS HIDROLÓGICOS SUBSUPERFICIAIS INFLUENCIADOS POR CORTES DE ESTRADAS RURAIS NA BACIA HIDROGRÁFICA DO RIO GUABIROBA, GUARAPUAVA, PARANÁ, BRASIL

Abstract

Although rural roads allow the development of rural communities, they alter the natural hydrological response of the river basin. This study was carried out in the Guabiroba River Basin, Guarapuava-PR, Brazil, in order to verify how subsurface hydrological processes are influenced by rural road cuts. For that, field surveys were carried out to identify the types of interception of the flow in subsurface. Rainfall (mm), groundwater level (cm) and flow (l / s) were also monitored at the interception sites. As a result, three main types were identified: return flow, pipe flow and saturated troughflow. The pipe-type flow responded by more than 60% of the intercepted flow volume, however, the height of the water table level and the dwell time was higher in the return flow. The saturated troughflow contributed 20% of the volume of intercepted flow. It is concluded, therefore, that the types of subsurface interception and the differentiated mechanisms of these can alter the natural hydrological dynamics of the basin, provoking a shorter response time than through infiltration and displacement in the soil. Thus, studies on rural roads are fundamental for the development of rural communities from a geographical point of view.