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Innovative Hydro Up- FloTM Filter Achieves Surface Water treatment ‘First’
by Sharon Lindsay Client: Fairview New Homes Ltd
Main Contractor: JL Knight Roadworks
Consultant engineers: Infrastructure Design Ltd
The Up-Flo™ filter modules in the chamber, showing the innovative penstock screw raising and lowering to assist easy maintenance access.
Flood Risk & Drainage
One of the first UK stormwater treatment solutions using Hydro’s innovative Up-Flo™ filtration technology has enabled developer Fairview New Homes to incorporate SuDS with two levels of treatment into the surface water drainage for a new access road.
Environment Agency planning requirements sought two levels of treatment for the new commercial access road in Faversham, Kent, but a SuDS solution using completely natural features was not possible. Developers Fairview New Homes and consultants Infrastructure Design Ltd worked with Hydro International to develop a unique solution for the site which combined a custom-modified Up‑Flo™ filtration unit with Hydro StormBloc® modular storage and infiltration blocks.
Jim Brand, Maintenance Manager of Fairview New Homes explains:
“Working closely with our engineering consultants and Hydro, we were able to put together a fit-for-purpose solution which met the maintenance requirements of Kent Highways, while satisfying SuDS principles.”
The access road is needed to service retail and light commercial units as part of the mixed-use redevelopment of the Eurocentre wholesale distribution centre, on the site which is bounded by the London to Dover main railway line.
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While much of the access road offers natural flow to a swale for treatment, around 100 metres of the road was below surrounding land.
“We needed to provide polishing treatment to remove finely dispersed pollutants, as it was adjacent to a source protection area,” points out Phil Tomes, of engineering consultants Infrastructure Design Ltd. “To create sufficient fall for a swale, we would have had to try and install it some three metres below ground level, which was not possible.
“We had to look at engineered solutions and the Hydro Up- Flo™ solution was ideal. The unit could be located in a chamber at sufficient depth to provide effective settlement, screening and filtration treatment for the water.”
Rainwater from the road passes initially through a bypass separator (the first level of treatment) before entering the concrete chamber containing the Up-FloTM Filter. The Up- FloTM Filter acts as a sump where sediments are allowed to settle. Any floatables are controlled by baffles on the Up- FloTM Filter module inlet. The water flows up through the fine sand filter medium in the six filter modules until it discharges through the outlet. The Up-Flo™ Filter unit thus provides the essential second level of treatment, removing coarser sediments and floatables and fine suspended solids.
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