Retention Systems Prevent Floods and Water Scarcity in Warsaw

When densely populated urban areas expand, aboveground as well as underground infrastructures are extended to suit the growing demands. Sewer systems are counted among the most important underground structures. In regard of such, dealing with extremely high and low water peaks has beco me a particularly pressing problem in recent years as climatic change may one-time bring droughts and another torrential rain. Temporary water storage capacities are therefore being enlarged or added in drainage systems. Since they present a by far more cost-efficient solution than an otherwise extensive enlargement of existing networks they are also applied for securing potable water supply, flood protection, sewer and treatment plant relief and for leveling different degrees of water pollution. Under the often constricted circumstances at the construction sites, light weight and compact components are highly advantageous, facilitating transportation and handling, a safe and simple joints speed up installation and make sure the whole system is leak-proof. Poland has been investing a lot in its infrastructure over the past years and a considerable number of projects have been realized with various types of tanks. HOBAS supplied for instance rainwater retention tanks but also emergency and special tanks. Particularly worth mentioning are projects realized in Warsaw, one of which was implemented in the course of redeveloping Jerozolimskie Avenue. Wastewater needed to be retained to make sure that no more than 50 liters run into the stormwater sewer per second – a limit set by the Municipal Water Supply and Sewage Company (MPWiK). Two new retention tanks with a total capacity of 440 m³ have been integrated to this end. The first is 90-m-long and DN 2400 in diameter and is equipped with a swirling chamber whereas the second, 22-m-long and DN 2000 in diameter, accommodates a horizontal sedimentation tank.