Case Studies

Berewood Phase II

SDS Aqua-Swirl protects residential development from runoff pollution.


The 500 acre “Newlands” residential development at Berewood, Hampshire, is the largest of its type in the UK and, once completed, will accommodate over 2,500 homes, supported by a range of amenities and around 100,000m2 of employment land.

Construction of the whole development began in 2012 and is scheduled to continue until 2021; this second phase commenced in late 2017.

Phases of consented land are being released to housebuilders only after the supporting infrastructure has been installed, for which SuDS are considered a priority. As each phase is launched, further SuDS will be installed, with developers integrating the existing surface water drainage scheme into each of the housing and commercial packages.

Most recently SDS has been required to provide pollution prevention services whilst helping to develop a new wetland resource of substantial ecological and amenity value.

How it works

SDS has worked closely with Consulting Engineers, Mayer Brown, to establish the key design criteria for the site’s sustainable drainage systems. This has resulted in the adoption of a “SuDS management train” approach, whereby a series of above- and below- ground drainage techniques are used to change the flow and quality characteristics of the runoff in stages.

In this latest phase, a network of 4 SDS Aqua-Swirl™ model AS-2 and 3 SDS Aqua-Swirl™ model AS-3 Hydrodynamic Vortex Separators has been installed.  Surface water runoff from the roads and the housing development construction site is first cleaned before entering one of seven separate ponds and swales that have been landscaped into the development.

SDS Aqua-Swirl™s were selected due to their ability to surpass Environment Agency required standards, thereby maximising pollution mitigation.


It has also been a requirement of the manufactured features of the scheme that they are capable of performing their role of controlling water not only upon final completion of the development but also during its periods of construction, i.e. with a substantially higher level of water-bound contaminants than might normally be expected.

Paul Stewart, Technical Director, Mayer Brown: “Specifying SDS Aqua-Swirl™ hydrodynamic separators gave us added flexibility to engineer high-performance water quality protection upstream of SuDS ponds for the latest phase of the Berewood development. SDS’s bespoke in-house manufacturing facilities, together with a wide choice of product sizes and outlet pipe diameters, allowed us to minimise the sizes of the devices we required. With the added benefit of the Aqua-Swirl’s lightweight plastic construction, we were therefore able to reduce excavation and construction costs significantly.

Berewood sits on the border of Winchester and Havant, close to the bustling market town of Waterlooville.

In creating a vibrant place to live, work and play, that people can be proud to be part of, Grainger describes this emerging new community as a fantastic place to live and visit.

What our other Customers say

SDS helped us to engineer a successful SuDS outcome at an extremely challenging brownfield location. SDS GEOlight® tanks were integral to the drainage solution, providing attenuation to meet the very low site discharge rate on a steeplysloping site with limited space and no opportunity to infiltrate. Using below-ground storage in conjunction with surface water drainage features facilitated environmental and wildlife benefits above-ground, while achieving sufficient surface water storage necessary to satisfy planning requirements at this sensitive location.

Ben Rayner, Principal Engineer, Stomor Group.

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