WaBack backwater stop solves flooding problems. WaBack stops potential backflow in pipelines and prevents storm water or overflow from forcing its way back into the building.
WASTOP ACCESS PROTECTS RESIDENTS IN LEWISTON NY, USA
|Location: Lewiston New York, USA
Client: City of Lewiston
Problem: The effect of combined sewers (combined wastewater and storm water) and an area prone to flooding from the Niagara River, a section of Upper Mountain Rd in Lewiston New York have experienced repeated flooded basements. On a visit with Jeffery Ritter of the City of Lewiston, Bob Wiltshire of Koester Associates discussed the applications for and advantages of the WaStop in line elastomeric check valve in preventing back flows and flooding. Jeff thought their just might be an application in Lewiston where the WaStop might be put to good use.
Solution: A packaged residential WaStop unit was installed in the Fall of 2013 at a residence. Previous floods had cause damage in excess of $4000 per occurrence to the basement furnishings at this location. Since the Wapro Access unit was installed there have been no more flooded basement situations. The home owner can now have peace of mind knowing that their property is protected with an innovative, dependable and uncomplicated valve.
Design: Wapro Access Chamber with WaStop module. Note the 8 foot deep extension tube installed as a riser from the Wapro Access chamber.
The Wapro Access Chamber is a complete inspection chamber Ø400 (NPS 16″) with DN110 – 160mm (NPS 4-6″) connections. Inside the chamber is a WaStop check valve to prevent backflow. The ‘easy-remove’ check valve makes the chamber easy to rinse. The check valve can be removed from ground level. Wapro Access Chamber can be installed in sewage, drainage and surface water networks.
Thanks to Koester Associates for supplying this information. www.koesterassociates.com
WaBack Protects Danish homes from Basement Flooding
Svendborg is an old, charming town on the southeastern of Fyn, Denmark, with a lively trading community and around 27 000 residents. Climate changes in recent years have led to an increased number of floods resulting in flood damage to a large number of homes and properties. An increasing number of people have begun to invest in equipment and solutions to secure their property against floods and torrential rain.
A small suburb in northwestern Svendborg around Nylandsvej suffered problems with basement flooding in numerous homes during heavy rain events.
The root of the cause is that pipelines in the street are not adequately dimensioned for the heavy rainfall and the increase hard surface area development has brought with it. The rain cannot be removed quick enough which leads to surcharged stormwater and sewer lines, leading to basement flooding. Until now, the insurance compensation covered the cost for flood damage. In the future, however, this insurance will diminish. The decision was therefore made take preemptive measure to prevent basement flooding. The home-owners group worked in cooperation with Danske Skybrudrådgivningen to investigate solutions for the project.
Thanks to Grønbech & Sønner A/S for their technical assistance this installation.
|Installation of WaBack non-return valve in Svendborg, Danmark.|
WaStop Protects Beautiful Town Square in Rivergaro, Italy
Rivergaro town square recently underwent renovation to give the townspeople a beautiful place to meet and enjoy the local fare.
The river Trebbia runs close by the square, and has, throughout the course of history, caused numerous floods in the original town square. During the design phase of the town square the local authorities in Rivergaro promised to develop a system to prevent that the public space becomes inundated during high water levels in the river. During the most recent flood of September 2015 shops, basements and businesses suffered major flooding due to backflow from the river through the storm water drainage pipes.
To alleviate this problem, it was decided to invest in flood protection. Four WaStop in sizes from DN600-DN800 were to be installed to protect Piazza Paolo and Meucci areas. WaStop was the valve of choice given that the valve is closed and protecting the city in is normal state, whilst allowing stormwater to exit the system on demand.
“These installations are a blessing for us, a necessary and important intervention” says the Deputy Mayor Mauro Rai. “We cannot say we are out of danger during floods but now we at least don’t have to worry about the Trebbia River. We created this beautiful square from an aesthetic point of view but also put great emphasis into making it secure, preventing the square from flooding again. The installation of these valves is one of many hidden jobs that are not visible to the public but which are invaluable.”
Shortly after installation the WaStop Inline Check Valves were put to the test, and provided 100% flood protection giving peace of mind to the local authorities, as well as the residents.
Thanks to Euronova for the information surrounding this installation.
Wastop installed in Rivergaro to protect the
WaStop chosen to protect Forest View from flooding
|Location: Forest View
Customer: The Village of Forest View
Originally Forest View had a combined sewer and stormwater system. As the area became popular development occurred which lead to more hard surface areas, which lead to higher runoff during rainy periods. This became such a problem that, in the 1960’s the sewer and stormwater system was split to ensure that high rainfall events didn’t overload the sewer system causing backflow into residential properties. The two split systems joined again just before the treatment plant. The construction of a dedicated stormwater outfall allowed a complete split of the two systems with separate storm and sanitary sewers.
Despite the split systems the area of Wenonah Avenue still suffered from flooding in the lower areas during high rainfall events. This was caused by under dimensioned storm sewers. Several options were available for solving the issue. Two solutions were seen as being effective in stopping the flooding, without causing issues to other nearby areas. One of these solutions would be to lay large pipes in order to store the water until the rainfall subsided and the system could drain. The negative side of this solution was the cost and the intrusive nature of the work. To thoroughly assess this potential solution a study was made of the soil in the designated area however it was deemed that the soil was not appropriate for this type of work so another solution was investigated.
Brad Clark, a Principal at Hancock Engineering, came in contact with WaStop inline check valves through a presentation given by Eric Johansson. He could instantly see the reliability of the cone shaped membrane and felt that would be less prone to clogging than other check valves. He could also appreciate the low headloss and pulsating flow which would mean his pipes would empty quickly and debris would be kept away from the outlet.
Solution: 12 WaStop Inline Check Valves in stainless steel sized between NPS 8″ – 12″ (DN200-300)
Thanks to: Fischer Harris and Hancock Engineering.
WaReg protects homes from flooding in Sweden
|Location: Backaryd, Sweden
Customer: Backaryds Vattenverk
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.
WaStop installation in Mönsterås – 15 years on …
|Mönsterås in Sweden was one of the early WaStop Inline Check Valve installations.
The issue faced was high sea levels during onshore winds. This caused the sea water to be forced up into the stormwater system, leading to back flow into the sewer system through the emergency overflow pipes. This in turn caused flooding in low lying houses upstream as well as surface flooding in low lying areas.
Two WaStop DN600 valves were installed in 2001 to prevent the sea water back flow. A flood bank was also built to prevent the sea level coming overland and causing surface flooding. Behind the WaStop valves a pump was installed to ensure that when high sea levels coincided with rain, the stormwater was still able to exit preventing surface flooding. The pump is automatic and starts when a specific level is reached.
The WaStop valves have been installed since 2001. They’ve been working perfectly with minimal maintenance and 100% functional operation time. This gives peace of mind for residents and the local council.
Five large wastop protect Osijek, Croatia
|The Drava River is one of the five largest tributaries of the Danube River, and flows through five different countries to its mouth downstream of Osijek. The Drava’s main tributary is the Mura River, and the two meet in Croatia to form a unique natural river mouth. The river has a history of flooding and causing extensive damage to the surrounding towns and farms. In an effort to mitigate the flooding in Osijek 5 WaStop Inline Check Valves have been installed. Three DN 1000 (NPS 40″) and two DN1500 (NPS 64″). These installations prevent back flow from the river into stormwater outfalls when the river is in flood conditions.
These 5 installations give peace of mind to the inhabitants that have lived with flooding for centuries and will protect future generations.
Hornsey, London, UK protected against sewer backflow
|Flood defence is a major part of Thames Water’s work across the south-east of the UK. While in most situations traditional flood control techniques can be used, there are some occasions when a problem can only be solved by alternative technologies. One such example is Cross Lane in Homsey, north London, where the sewer network can sometimes struggle to cope with the demands of a modern society. In this case, surcharges overwhelmed the existing pipes and were flowing up through manholes, causing flooding to roads and properties.
When Thames Water investigated the problem, the traditional solution would have been the installation of an anti-flooding device (FLIP) or a new pumping station and while this would resolve the flooding problem, the cost would have run to around £300,000 to protect what, in practice, was a small number of homes.
Aquatic Control Engineering (ACE) approached Thames Water to offer an alternative solution – the WaStop inline check valve. ACE supplied a valve that would fit snuggly inside a DN225 pipe and offer outstanding protection from back flow.
The main body of the WaStop was manufactured in stainless steel 316 which would protect it from possible corrosives in the water. Due to the potential high back pressure, the valve was fitted with a heavy duty cone designed to withstand 8MwC. While the valve is designed to offer outstanding protection it also opens with a low head pressure which means there is no foul water allowed back up the pipes. The ways in which the WaStop offered huge savings include short installation times and a reduction in civil engineering requirements. The installation of the valve was completed in around an hour by a small team from Thames Water.The WaStop check valve is designed to offer maintenance-free operation for 25 year, which means over its lifespan it will keep saving Thames Water money compared to the original proposal.As we see ever more frequent flooding events, the first rea I test of the installation cannot be far but we expect it to pass with flying colours and hope the installation will form the blueprint for similar situations across the country.Thanks to Aquatic Control Engineering in UK.
WaBack Mini protecting Oslo basement