A total of 300 buildings located in the city of Rosario, Argentina, incorporated during their construction a system of retarders or rain regulators, which allow to pour about six million liters of rainwater into the rainwater network of the city progressively in the maximum peaks of rainfall.
This was achieved through an ordinance in 2008 that obliges buildings over 23 meters high or with a waterproofing area greater than 500 square meters to have this type of reservoirs.
Measures like this, together with the proposal of Green Terraces, are part of the strategy that seeks to reduce the impact that heavy rains have had in recent years on cities in the center of the country
This type of event, which for some families has become catastrophic when they lose their properties, makes the measure of retarders become an urgent need.
The regulation system basically consists of a reservoir (tanks, chambers, ducts or any transient tank) with the capacity to store 650 liters in buildings of 100 square meters, 1,200 liters in those of 200 square meters, 1,600 in those of 300 and so on.
The retarder receives part of the pluvial effluent collected in roofs and floors and derives it, according to the infrastructure equipment that exists, to the sidewalk cord, the trench or an existing rainwater or rainfall duct, through a regulated and progressive exit.
For now there are 300 buildings that have this system, of these 206 correspond to small buildings, 50 to intermediate and another 50 to complexes of half a block. With this it is possible to delay the rainwater system by 6,000 cubic meters of water in each rain.
