Here you can find case studies referring to WaStop® being used to protect against surface water flooding.
Hirschthal, Switzerland – WaStop DN1200
Location: Hirschthal, Switzerland
Problem: During times of high river levels, flooding occurred in the town of Hirschthal. This flooding occurred when the river level was higher than the stormwater outfall. This lead to river water pushing back up the outfall pipe, and spilling onto roads and residential areas.
Solution: A DN1200 (NPS 48″) WaStop inline check valve was installed inside the stormwater outfall to allow stormwater to flow into the river but to prevent any backflow from flowing back up the stormwater outfall during high river levels. This gave the townsfolk peace of mind knowing that the town would not suffer from flooding cause by backflow.
Design: DN1200 Stainless Steel insert WaStop
Thanks to Canplast Switzerland for supplying this information. www.canplast.ch
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.
WASTOP PROTECTS Warsaw FROM the vistula
|The Vistula (Polish: Wisła) is the longest and largest river in Poland, at 1,047 kilometres (651 miles) in length. The drainage basin area of the Vistula is 194,424 km2 (75,068 sq mi), of which 168,699 km2 (65,135 sq mi) lies within Poland (splitting the country in half). The remainder is in Belarus, Ukraine and Slovakia.
The Vistula rises at Barania Góra in the south of Poland, 1,220 meters (4,000 ft) above sea level in the Silesian Beskids (western part of Carpathian Mountains), where it begins with the White Little Vistula (Biała Wisełka) and the Black Little Vistula (Czarna Wisełka). It then continues to flow over the vast Polish plains, passing several large Polish cities along its way, including Kraków, Sandomierz, Warsaw,Płock, Włocławek, Toruń, Bydgoszcz, Świecie, Grudziądz, Tczew and Gdańsk. It empties into the Vistula Lagoon (Zalew Wiślany) or directly into the Gdańsk Bay of the Baltic Sea with a delta and several branches (Leniwka, Przekop, Śmiała Wisła, Martwa Wisła, Nogatand Szkarpawa).
Large-scale floods in 2010 caused by heavy rain and rapid snowmelt in the mountains forced cities up and down the river to race to sandbag streets and buildings along its banks. In Krakow, the mayor declared a state of emergency after the river passed the high-water mark at 74 cm above average. The next day the river swelled to 300 cm above flood stage. The massive stone bulwarks lining the river held firm, though, and channelled most of the problem past the city and downstream to other cities, which suffered inundation. In some cases the water clearly revealed the naivety of local officials who had allowed wide development in the now soaked flood plains. About a month after wave upon wave had passed, Warsaw and the other cities dried out and returned to normal and the tamer river continued flowing, almost acting as if nothing had happened.
There are many stormwater outfall into the river which become channels for backflow during flooded river conditions. The flooded river pushes water back up the stormwater pipes leading the water directly into the suburbs. Instead of the stormwater pipes leading water to the river the exact opposite occurs which causes massive flooding.
Installing a WaStop on the outfall effectively prevents any flood waters entering the stormwater pipe and therefore stops flooding. The stormwater is still able to be released into the river but river water is kept off the streets and out of the houses in the surrounding areas.
Another successful installation with hundreds of people now protected against flooding. Thanks to our distributor in Poland, Rafnar.
Homeowners in Paddington, Australia, no longer suffer from flooding
Solutions for flood protection needs to function, simply and effectively. When we at Wapro invented WaStop inline check valve we had one thought in mind – instant automatic protection. Working on differential pressure, WaStop functions autonomously without human interaction, electricity or constant maintenance.
The home owners in Paddington, Australia, had constant flooding in their terraced house front porch after rain due to stormwater overflowing from the street. The area then had to be drained manually every time the flooding occurred. To give the home owners peace of mind, a WaStop inline check valve was installed into the homes drainage system. Keeping common sense and simplicity as keywords throughout development, Wapro is able to provide a solution which can be installed in minutes with just flexible couplings and a screw driver. Simple and effective.
Since the installation of WaStop, the home owners in Paddington are extremely happy with the outcome and that they no longer suffer from flooding, not even during heavy rainfall. Through the innovation of WaStop Inline Check Valve, we at Wapro have protected thousands of homes worldwide.
Holding back the flood.
WaStop installation in Paddington.
WaStop inline check valve protects Hull
ROAD FLOODING PROBLEM SOLVED IN CRACOW, POLAND
|The Municipality of Cracow had problems during heavy rainfall events for many years. The problem was flooding that occurred within one of the tunnels in the city center. The gravity sewer was pushingwater out of the drainage system and was causing flooding under the crossroad blocking the passage completely.
Having previously experienced the effectiveness of WaStop check valves Cracow Municipality decided to use 2 x DN315 WaStops to ensure backflow was prevented. This allow the road to be open even during heavy rainfall, something which the population of Cracow appreciated.
Thanks to Rafnar s.c. for this information. www.rafnar.pl
WaStop DN110 Lakes Entrance, East Gippsland, Victoria, Australia
|Location: Lakes EntranceCustomer: East Gippsland Shire CouncilEnd User: Eastern Beach Holiday Park
Problem: A camping ground had problems with flooding in a low lying area that was close to the tidal river. The flooding was due to the tidal river flowing back into the stormwater pit which overflowed onto the surrounding ground. Whilst the tide was high the stormwater pipes were filled with sea water reducing retention capacity. This lead to several flooded camping sites in the holiday park leading to an inability to rent out those sites during certain seasons which meant a loss of income for the holiday park owner.
Solution: A offline pit was dug beside an online pit to take ground water run-off. A WaStop was installed between the online pit and the offline pit to prevent backflow into the offline pit during high tides when the online pit fills with water from the tidal river.
WaStop Design: A standard WaStop DN110 was installed between the pits.
Thanks Hygrade Water Australia for supplying this information. http://www.hygradewater.com.au/
Dabrowa Gornicza, Poland DN300 & DN500
Dabrowa Gornicza suffered from flooding during periods of heavy rain. Storm water previously flowed back through the pipe networks towards the town exasperating the problems already occurring within the city.
The City purchased and installed two WaStop check valves on important storm water pipes to prevent the backflow of storm water into the city. The installation was completed quickly and since installation the valves have protected the city numerous times. Thanks to Rafnar s.c. for this information. www.rafnar.pl