stormwater tank

A large underground facility integrated into a city's sewer network, designed to collect the excess water left by heavy rainfall, often associated with storms. We can compare it to a gigantic cistern. Sewers channel the water toward large collectors connected to the stormwater tanks. These tanks can be placed in series or in parallel and contain several elements. The first is the central chamber, where the initial waters arrive, resulting from the sudden increase in flow caused by the high intensity of precipitation. These are wastewaters that need to be appropriately treated. Next comes the so-called retention chamber, which collects the water that the central chamber can no longer store. This is followed by a third chamber - the relief chamber -, which gradually discharges water, and finally the dry chamber is located, intended to regulate the outflow. The main objective of stormwater tanks is to reduce the risk of flooding in a city from water accumulation resulting from an episode of torrential rain or a high-intensity hailstorm. It is also known as a pluvial reservoir.