Articles & Case Studies


Posted: Monday 28th September 2009

Drainage and fluid flow specialist ACO Technologies has designed and manufactured two new water features within the refurbished central courtyard at Her Majesty’s Treasury in London.

ACO used modified stainless steel drainage channels in reverse to deliver a constant depth sheet of water along a combined total outlet length of 18m.

Designed by Foster and Partners with landscape design by Gustafson Porter, the central courtyard refurbishment creates a ‘bridge over pond’ finished appearance through the installation of two separate pools either side of a solid horizontal walkway. Each opposing pond is fed by a 9m horizontal sheet of water that emerges at the courtyard perimeter and runs across 6m of shallow gradient slate to the collection pond at the central ‘bridge’.

Working in partnership with M&E contractor, ISC, ACO Technologies developed a delivery system capable of producing a constant 4mm outlet depth along the entire length of each outlet. This was required to produce a permanently wetted surface that would highlight and enhance the visual qualities of the slate surface beneath. In order for the courtyard to be used as a function venue, the system also had to have the ability to run dry and safely accommodate pedestrian traffic across the flow path.

Roger Brigham, design manager at ACO said: “The greatest challenge with the delivery system was to flatten the high points that would occur at the fluid entry points below the main horizontal outlet. With restrictions on both the number of entry points and the size of any holding chamber under the outlet, the system has to accurately control the flow patterns within the delivery chamber to ensure an even outlet profile.”

“As Europe’s largest producer of bespoke stainless steel drainage and fluid management

products we have been able to exploit the latest fabrication techniques to successfully work

within the tight tolerances demanded by this installation.”

For more information contact the sales team at ACO Building Drainage on 01462 816666, email or visit

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