Coastal and river outfall pipes can be partially or completely buried by sand, shingle and mud. These materials can be deposited in a single tide or change with river currents so planned clearance is of little value. Tideflex all rubber check valves are an excellent alternative to flap valves for these outfall applications.
In order to mitigate flooding in Glasthule Village from sewer overflows during storm events, a CSO outfall to the sea was constructed as an interim measure. A CheckMate non-return valve was identified as the best product for installation on the CSO outfall pipe to prevent backflow from the sea entering the sewer system. The low headloss of the CheckMate valve meant that a pumped solution was not necessary.
The Forres (River Findhorn & Pilmuir) Flood Alleviation Scheme, completed in 2014, has to date prevented flooding of around 1000 properties at a saving of approx. £27 million. We are proud that our Tideflex valves form part of this important scheme.
*Updated and re-published 27 January 2016
Between 1995 & 2009, Clonmel Town suffered severe flooding on a regular basis from the River Suir and its tributaries. Tideflex valves made a crucial contribution to the design & construction of this important flood defence scheme, being installed where traditional flap valves posed a risk. The scheme, and the valves, performed admirably during the major floods over the 2015/2016 Christmas period, considered its first significant flood test.
The chalk geology of South-East England has had a unique influence on the history and engineering of the region. The rehabilitation of Thanet district's Victorian sewer system is a complex project undertaken to prevent further groundwater contamination from sewage. MeasurIT is providing a large number of 100mm Tideflex valves to help ease the transition from the old to the new.
Flap valves on the stormwater discharges to the tidal section of the Parrett River at Bridgwater were constantly blocked due to mud & silt. In 2013 Wessex Water decided that Tideflex duckbill valves would provide the solution, with their proven track record in being free draining and self-clearing. We have no doubt they will be happy with their choice for decades to come.
Scottish Water’s Loch Ryan project rationalised existing assets down to one major wastewater treatment works (WWTW) with a long sea outfall into the north channel of the Irish Sea. A Tideflex duckbill valve was the obvious choice for an outfall where access for maintenance would be an issue.
The coal harbour at Dun Laoghaire dates from the 18th Century and the outfall of the culverted watercourse seemed a simple solution. However, the outfall was constantly experiencing blockages due to sand and rocks being swept into the outfall chamber. A Tideflex duckbill valve was proposed by MeasurIT as the most practical solution and this has been working without incident since 2006.
Tideflex duckbill check valves act very efficiently as diffusers and are used on many different effluent outfalls. When the sea outfall at Llangrannog was replaced, a Tideflex valve diffuser was the natural choice.
Another common, but less well-known, use for the Tideflex Checkmate check valve is preventing insects, rodents and other small animals from gaining access to drainage systems, while still allowing flows out of the system.
This site in Douglas, Isle of Man required a robust solution to the problems of a large culvert exiting into a chamber in the sea wall which is exposed to high seas. We proposed and provided an array of 5 Tideflex check valves, which is still showing no signs of fatigue since installation in 2000.
Twenty-two 900mm Tideflex check valves have been operating problem-free on the Tees Barrage Fish Pass since 1995. This is another example of how Tideflex duckbill valves can be used to solve complex or unusual problems faced in design.
A 500mm CheckMate non-return valve installed in 2010 keeps rainwater separate from irrigation water yet allows rainwater to fill the irrigation ponds.
Draining seven acres of roof through a 1500mm PreCast Concrete pipe into the Conn's Water river estuary, this 1840mm Tideflex TF-1 check valve has been in service since 2010.