Infiltration trenches

Infiltration trenches are excavations in the ground 2 to 3 meters long and 1 meter wide and deep, useful for reducing surface runoff and erosion. They are also used as part of rainwater treatment and collection systems, since the soil and porous materials of the trench can retain and filter pollutants from the rainwater before it infiltrates into the soil. When it rains, the water filters through the soil and reaches the surface of the infiltration trench, where it is absorbed and infiltrates into the soil through the porous materials. As it infiltrates into the soil, groundwater is recharged and available for future use. If the soil is clayey, rainwater can be stored and put to use.