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A two-dimensional infiltration model is presented to estimate infiltrated volumes and the humid area around rainwater infiltration trenches. The model, based on Richards’ equation, was originally developed by Tabuada et al (1995) to study humid areas around the irrigation furrows. The formula uses retention and non-saturated hydraulic conductivity curves. The purpose is to provide a tool to help size the trenches to control surface runoff at the source. The model was calibrated for two soils, one with higher clay and sit content, and the other with higher sand content. A validation was performed, considering the same initial condition of saturated soil. The results showed a reduction in surface runoff because of the use of trenches, but they supplied infiltrated volumes lower than those observed. This may have occurred due to uncertainties in the retention curves, as regards non-homogeneous distribution of the pore diameters. The infiltration capacity of the trenches for volumes applied equivalent to a given design rainfall was satisfactory in the sense that it reduced the surface runoff generated on the lot, even under initial conditions of saturated soil

Simulação Hidráulica de Trincheiras de Infiltração de Águas Pluviais