A Tideflex duckbill valve was proposed by MeasurIT as the most practical solution to the problem of a regularly blocked surface water outfall in a tidal area. The Tideflex valve has been working without incident since 2006.
Client: Dun Laoghaire-Rathdown County Council
Design Details: 1240mm Tideflex TF-1 valve with thimble plate in angled headwall
The coal harbour at Dun Laoghaire, Dublin dates from the 18th Century and the original outfall of the culverted watercourse seemed to provide a simple solution. The culvert ended in a chamber built into the headwall with two perpendicular curved exit points free-flowing onto the beach. However, the outfall was constantly experiencing blockages due to sand and rocks being swept into the outfall chamber by wave action of the incoming tide. A Tideflex duckbill valve on an angled steel backplate bolted to the wall (modified R7F) was proposed by MeasurIT as the most practical solution.
The original chamber exits were both sealed off with metal plates and a new exit point created in the endwall so that the Tideflex duckbill valve provides the only drainage point now. As the line pressure builds up in the upstream system, the valve opens and discharges, even when submerged. Due to its flexible and durable rubber duckbill design, the Tideflex valve is more than able to handle both the wave action and the debris of the sea. This solution has been working without incident since 2006.
Contact us to discuss a solution to your drainage outfall headache!
One of the old outfalls from the chamber in sea wall.
2 exits from the old outfall chamber configuration.
Tideflex non-return valve at low tide.
Tideflex check valve being submerged as the tide rises.