Monitoramento e modelagem hidrológica de plano de infiltração construído em escala real

Abstract

The purpose of this study was to monitor and later model the flow along an infiltration plane, built in real scale, for rain water management area of 3001 m2. Rainfall, inflow and water depth of flow over the inclined plane were monitored. The equipment employed for measurement was calibrated in triplicate through field measurements under conditions of controlled drainage of 9.3 m3 volume of water poured over the plane. 32 events were monitored of which only seven produced measurable water depth. The inclined plane was calibrated by PULS’ method considering constant and variable hydraulic conductivity obtaining mean R2 of 0.75 and 0.72. In the validation process, R2 of 0.71 was obtained for both cases. The drainage times of around 25 minutes were explained by the high rates of infiltration and the area of the plane. Observed average lag times was 5,9 min; times to peak 28,3min and flow time over the plane from 12,2 min. It was observed that the initial calculated water levels were superior to those observed, because there were flooded area, but the depth-area-volume ratio calculated by PULS did not adhere with observed data