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This paper presents the preliminary results of hydraulic geometry relations for rivers of the Western and Southwestern regions of Paraná Sate, Brazil. The natural levee was adopted as reference in determining the bankfull stage. The drainage area of the gauging stations ranged from 969 to 12,124 km. The relationship between drainage area and discharge, width, depth and channel capacity, all measures at bankfull stage, reaching values of correlation coefficient (R) equal to 0.94, 0.89, 0.49 and 0.83 respectively. These results show a strong correlation between the variables of regional hydraulic geometry for the gauged stations included in a physiographic region characterized by uniform climatic and geological conditions. The equations to estimate discharge and dimensions of the channel at bankfull stage from the watershed area. The information obtained can drive technical projects for river restoration and direct evaluations of the conditions of degradation in river environments

Relações preliminares da geometria hidráulica regional para rios das regiões oeste e sudoeste do estado do Paraná