TECHNOLOGY |
Vortex flow controls come in all shapes and sizes
age tank, comprising nearly 140m3 of Stormcell with a Hydro-Brake Flow Control device at the outlet. Now developments in vor- tex flow control technology have enabled new standards in design versatility to be reached that can help achieve significant construction cost savings. Flow controls have three basic elements: the in- let, outlet and the volute (the actual housing of the device which can either be snail shaped or cone shaped). Traditionally there was a fixed relationship between these three components, with some models allowing a small level of sophistication by al- lowing a minor adjustment in the inlet or outlet.
In the Hydro-Brake Opti-
mum from Hydro Interna- tional all three elements are independently configurable, allowing engineers complete freedom to design each unit for absolute fit and to balance flow rates and surface water storage requirements to suit each project. The result is opti- mised hydraulic efficiency and a storage saving of up to 15% compared with earlier technol- ogy, or alternative devices. n
The vortex is an engineering “fascination”
the whole site the run-off is regulated by gravity and the storm water drainage strategy is achieved without the use of pump stations.
Environmental perfor- mance is a priority for devel- opers of the new Meltonwest Business Park on the rural outskirts of Hull, who have used Hydro-Brake Flow Con- trol technology to engineer a natural solution to surface water drainage. Hull-based developers the Wykeland Group chose a sustainable drainage solution to regulate the expected high surface water flows created by the increased impermeable surfaces on the 50-acre site discharging into an existing open watercourse.
Aiming to achieve pre- development flow rates, two Hydro-Brake Flow Control devices were installed to regu- late the discharge from two balancing lagoons. The two Hydro-Brakes are located at the outfall of each of the la- goons to help control the on- ward flow of the watercourse
as it continues its journey
away from the site and to- wards the River Humber. An acclaimed retrofit SuDS scheme based on stormwater storage and infiltration tech- nologies and Hydro-Brake Flow Controls has alleviated flooding problems at a busy town car park at St Ives in Cornwall, caused by the fre- quent heavy rainfall.
A SuDS installation along the bottom of the car park slope has provide both under-
ground infiltration and stor- age attenuation as a two stage process to protect the proper- ties and the watercourse fur- ther down the slope.
The primary protective in- stallation comprises a drain- age channel along approxi- mately 100m across the slope, interconnecting a series of infiltration pits where Hydro Stormbloc is installed. The outflow of the channel is con- nected to the second line of defence, an attenuation stor-
Alex Stephenson is director of Hydro International’s UK Stormwater Division, and chair of the British Water SuDS focus group.
www.hydro-int.com
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Elvetham Heath main pond looking up to inlet with HB
trant.co.uk July 2012 | WET News | 9
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