Hynds Floatless Manhole System

The Hynds Floatless Manhole System is based on the installation of dispersion valves in manhole structures to relieve excess pore water pressures which may develop in soils subject to liquefaction during seismic events.
The design and ‘retrofitting method’ of installing this system is now available in New Zealand under license from Nippon Hume Corporation (Japan).

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