Reference
WaReg prevents flooding in Uppsala
This collection well connects five pipes into one. In order not to overload the network downstream, Uppsala Vatten required the client to release a maximum of 50 l/s.
Heavy rain can cause the water supply network to become overloaded. This in turn can mean that the waterworks cannot keep up, causing the stormwater system to fill up, resulting in overflowing into the sewage system. The treatment plant then has to receive clean water to treat, which places an unnecessary burden on the treatment plant, resulting in increased costs. The treatment plant can also become overloaded with backwater in the water supply network and basements as a result (risk of basement flooding). In the worst case, a municipality may be forced to overflow wastewater into a river or the sea, which can result in fines.
The solution
There are a total of 5 inlets to the collection well, 3 DN315 from a cassette tank, 1 DN400 from an oil separator and 1 DN500 from roof water and yard water. A shut-off valve was installed on the outlet, a DN200, to allow for the possibility of shutting off in the event of an accident so that contaminated water cannot pass on. On the incoming line from the oil separator is a Wastop DN400 that prevents water from going back into the oil separator and ruining the process. After this well, a WaReg DN250 was installed to control the flow to 50 l/s regardless of the pressure head in the tank. WaReg starts regulating immediately in the event of excess pressure and releases the desired flow regardless of the pressure head. This made the choice of Wareg easy.
