Stormwater harvesting works by capturing rainwater that flows over surfaces such as rooftops, roads, and pavements during a storm. This runoff is directed through a system of drains, pipes, or channels into storage areas like tanks, ponds, or underground reservoirs. Before storage, the water typically passes through filters or sediment traps to remove debris, sediment, and other pollutants.
Once stored, the water can be used for non-potable applications such as irrigation, flushing toilets, or certain industrial uses. In some systems, excess water can be slowly released into the ground to recharge aquifers or into stormwater basins to manage flow and reduce flooding. The process helps reduce the volume of runoff entering storm drains, which can decrease erosion and pollution in nearby waterways.
