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Runoff control structures are designed to capture runoff during peak flows, and can function as temporary storage sites. These structures are typically built with a discharge component to slowly release water into the nearby waterway to avoid it overflowing from the storage basin. It can be artificially built, for example by excavating a large area so that it is lower than the surrounding land. Also, it may only require minor moderations to the existing landscape, such as constructing a raised barrier or mound around a flat, low-lying area (e.g. sports field, park, parking lot), or designing buildings on pillars to create a basin for storage underneath. Green spaces such as wetlands may also be utilized as temporary runoff storage structures. The structure can be utilized for other purposes when not needed, for example as a playground, football field, recreational area, etc.…

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Runoff control structures to temporarily store rainfall