FP McCann Stormcleanser™ and Headwalls Integral to Stormwater Management on Essex Housing Development
Site: Housing Development, Cressing, Essex
Client: Bellway Homes
Civil Engineering Contractor: AD Bly
Products Supplied: 2100mm & 1500mm StormCleanser™
FP McCann has supplied two of its WRc approved precast concrete and stainless steel StormCleanser™ units to a new housing development in Cressing, Essex. Bellway Homes has recently completed the 118 homes site which includes both above and below ground stormwater management systems.
The 2100mm ID and 1500mm ID hydrodynamic separators are integral to the online site drainage network and are designed to provide an additional treatment stage prior to stormwater being discharged via the units into an open swale. The combination of manufactured treatment devices with natural SUDs provides an effective treatment path for stormwater, allowing the benefits of both systems to be realised – confidence in the approved treatment performance of StormCleanser™ with the biodiversity and amenity of swales and ponds. The industry leading performance of StormCleanser™ provided the option to use smaller chamber diameters to achieve the required treatment flow rate, resulting in significant cost savings compared to other manufactured treatment devices.
Installed by Hertfordshire based groundworks and civil engineering group AD Bly, the StormCleanser™ units have been supplied from FP McCann’s Ellistown precast concrete plant in Leicestershire. Pipe inlet and outlet openings have been pre-formed in the chamber as part of the manufacturing process. FP McCann’s StormCleanser™ was designed and delivered to site in its component parts for simple installation by the AD Bly groundworks team. This product can also be factory fitted complete within a standard precast concrete water management chamber. The stainless steel vortex insert has no moving parts and provides exceptional longevity of service due to its high corrosion resistance.
Surface rainwater and any pollutants enter the StormCleanser™ chamber via the inlet pipe where the internal layout then enables low energy vortex flow patterns to form. This allows floatable materials such as plastics and paper to gather at the top of the system and heavier sediment to settle at the bottom of the treatment chamber for removal by standard gully suction equipment. A baffle plate located above the sediment storage sump prevents the re-suspension of solids, providing scour protection during the most intense rainfall events. Treated water then flows out of the system into the main drainage network.
Additionally, FP McCann has supplied two standard precast concrete headwalls complete with safety handrails and grating, directly connected to the StormCleansers™ to provide outflow points into the open swale system.
Commenting on behalf of AD Bly, Egidijus Buivydas, Project Manager, says, “FP McCann delivered the 2100mm and 1500mm precast concrete StormCleanser™ chambers along with the internal stainless steel components. It was then a simple task for our drainage operatives to assemble the units safely and efficiently in-situ.”
FP McCann’s StormCleanser™ hydrodynamic separators will ensure that any surface rain water run-off into the swale system has been treated accordingly. The AD Bly groundworks team installed both StormCleanser™ units in a matter of a few hours.
StormCleanser™ can be installed in precast concrete drainage chambers ranging from 1200mm ID up to 4000mm ID accommodating pipe diameters from 150mm up to 900mm. Modular and bespoke designs are available for multiple inlet orientation with a choice of flow direction providing optimised performance to meet site specific requirements.
For sales and technical enquires, contact our Ellistown depot on: 01530240000 | sales@fpmccann.co.uk
