Vazão em canais fluviais pelo método do flutuador

The quantification of streamflow in river channels is crucial for water resource management, directly influencing the planning of agricultural irrigation, public water supply, and environmental monitoring. However, conventional methods can be expensive and require sophisticated equipment, making the float method a cost-effective alternative for streamflow estimation using simple and easily deployable materials. This study aimed to describe the theoretical and practical procedures for determining streamflow in natural fluvial channels using the float method. The research was conducted in the Piracolino River, in Vilhena/RO, following an experimental design based on the continuity equation, with defined transverse and longitudinal sections. Flow velocity was determined by tracking the displacement of a float between the designated sections, with data corrected using coefficients adjusted to the riverbed characteristics. The results indicated that, although less precise than more advanced techniques, the float method provided reliable streamflow estimates, yielding a calculated value of 2.95 m³/s. The primary limitation of this method lies in external factors such as riverbed irregularities and variations in float shape, which may affect measurement accuracy. Nevertheless, the method proves to be a viable approach for streamflow measurement in small to medium-sized rivers, enabling frequent and cost-effective hydrological monitoring.