Siphonic Drainage Systems

With a gravity flow drainage system, capacity is limited to one-third water, which adheres to the inner pipe wall, with a large two-thirds air core. Our HydroMax™ drainage system is different. Air is purged from the pipe so that it runs 100% full of water, enabling smaller diameter pipes to remove higher volumes of rainwater.

Designed to accommodate recent changes in storm patterns, as stipulated in BS EN 12056-3:2000. It uses the naturally induced siphonic principles to ‘suck’ the rainwater from the roof into small diameter pipes, creating a flow capacity up to ten times greater than that of an equivalent gravity-fed system.

Terrain HydroMax™ offers full compliance with BS 8490:2007 using Terrain FUZE BBA certified pipes and fittings.

We fully understand how important it is to have design freedom so our HydroMax™siphonic pipe work can be installed horizontally without a slope – giving you the freedom to decide where you want the downpipe locations to go.

This also enables a significant reduction in underground drainage, trenching, soil removal, treatment of backfill and often means no drainage is required under the building floor slab.