WaReg protects homes from flooding in Sweden - Case Study

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Courtesy of Wapro AB

Location: Backaryd, Sweden

Customer: Backaryds Vattenverk

Problem:

Backaryd Water Treatment plant backwash their filters regularly. During this process water is released into the town sewer network at a rate of 16 l/s. The towns sewer network is dimensioned to cope with 5 l/s so when it receives 16 l/s it becomes problematic for downstream residents. When the backwashing occurs, homes in the downstream area suffer from backflow into their basement through toilets, showers and floor drains.There is a few different methods to solve this issue. One being to increase the pipe size to accommodate the flow. This however is an expensive solution for a town of 365 people. The more effective and less resource demanding solution is to control the flow, attenuate the excess and only release what the downstream pipes are capable of handling.Solution:

A WaReg flow regulator was installed to regulate the flow out of the water treatment plant. WaReg releases a maximum of 5 l/s which is what the downstream pipes are able to handle without being in the risk zone for basement flooding. When the flow is exceeds 5 l/s WaReg regulates the flow and the excess water is retained in a attenuation pipe system. This allows the water treatment plant to perform their regular cleaning, and gives the home owners peace of mind that they won’t suffer again from basement flooding.

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