Flood Risk & Drainage
www.managingwater.co.uk
There is no equivalent. Optimum H dra
Optimum Hydraulics Ta
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For further information call the Hydro-Brake or visit
www.hydro-int.com
For further information call the Hydro-Brake® hotline: 01275 337937 or visit
www.hydro-int.com
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w mechanism adaptation for
“Kent Highways specified maintenance requirements before agreeing to adoption of the installation”, continues Phil. “Kent preferred to avoid their crews having to physically enter the chamber through a manhole cover in order to change the filter medium bags in the Up-FloTM unit.
“To accommodate this requirement, the consultants asked us for some input,” states Marcus Mumford of Hydro’s design team. “We responded to the need by innovating a design modification, which demonstrates the versatility of the Up-Flo™ Filter unit. The modification can now be used by other Hydro customers to meet similar requests in future.”
“We adapted the design by mounting the modules containing the filter bags on a platform that could be raised and lowered with a screw-operated penstock gate mechanism. The design enables the filter bags to be exchanged at approximately ground level. Maintenance intervals are currently estimated as yearly or longer.”
To meet the surface water discharge constraints for the site, the final discharge from the filtration unit has to be infiltrated into the ground. Without room for a separate soakaway, a Hydro modular construction StormBloc® storage infiltration tank was used. Because it is loadbearing, it could be easily sited under public space in a shallow excavation and landscaped over. This provides around 180 cu.m. of storage attenuation and
infiltration, without occupying valuable surface area. Already used extensively in the US, The Hydro Up-Flo™ Filter is still a relatively new technology to the UK. It has a gentle action to facilitate sediment settlement, due to the rising water flow through the filter unit system. The drain down system eliminates virtually all possibility of blinding and clogging. The design ensures that maintenance is infrequent and simple, with bagged filter media from the modules being exchanged manually, and a standard gully vacuum unit employed to remove sediment from the sump.
During any extreme rainfall events, a bypass system, with baffles to exclude floatables, allows a temporary overflow to discharge. As well as its availability in concrete vault design which can be upsized to meet a range of maximum flows, other Up-Flo™ configurations are available, including single packaged units suitable for manhole–sized installations, and separate filter units for retrofit. Filter media can also be selected to meet specific water quality and pollutant requirements.
For more information about Hydro’s Stormwater management products please call 01275 337977, email enquiries@hydro-
int.com or visit
www.hydro-int.com.
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