CPD Specifier magazine - January to May 2014 issue Jan 2014 | Page 40

Stormwater Management

STANTON BONNA ELLIPTICAL
PIPES MINIMISE
FLOOD RISK FROM
GREENFIELD SITE
PROJECT
Barratt Homes ‘Greenacres’ housing development, Pontefract
BRIEF
Efficient attenuation system needed to restrict
stormwater peak flows to ensure minimal impact
on environment of housing development.
PRODUCTS SUPPLIED
Elliptical Pipes and Circular Pipes
KEY BENEFITS
High strength at low depth; Efficient hydraulic flow;
Watertight; Cost effective system; Sustainable solution

Stanton Bonna Elliptical Pipes provide
a sustainable solution to help manage
stormwater peak flow at a new housing
development.
The demand for new housing in Pontefract led
to an £8m investment by Barratt Homes which
included 48 properties on a 3.2acre site just off
Pontefract Road.
With the area being a greenfield site, the
developers, Barratt Homes had to ensure that
the local environment
was not impacted. The
brief was to ensure
stormwater peak flows
off site ‘mimicked’ the
existing situation.

They then selected Stanton Bonna’s elliptical
pipes since they offer the following benefits:
l perfect profile for low cover levels
l in situ secondary inverting is not required for
dry weather flows
l no extra jointing materials required due to
integrated watertight elastomeric gasket
l Stanton Bonna elliptical pipes were cost
effective due to their low cost and quick
installation
Luke Martin continued, “The use of elliptical pipes
was a lower
cost option
than box
culverts when
restricted to
keeping the
attenuation
within the
adoptable
carriageway”.

“We were really happy with the
products, service and
ease of installation..”
Martin Towey,
PJ Towey Construction Ltd

The site had its
challenges with the
landscape being
quite steep, limited depth was available for the
installation and the attenuation tank would need to
accommodate vehicle loading to Highways Agency
standards.

Elliptical pipe fitting with side entry manhole

The Stanton Bonna technical team worked closely
with the design consultants on the side entry
manhole fittings, a bespoke spigot fitting and end
walls to complete the design and layout.

Luke Martin, Engineer for Barratt Homes,
explained “...circular storage pipes would not have
a large enough cross sectional area to keep the
attenuation in the lower part of the site. We would
have needed very deep drainage with extensive
costs associated.”

A total of 31 x 2.4m lengths of elliptical pipe (DN
2650 x 1500) were supplied, including fittings
with end walls, a 600mm diameter spigot and
18 degree bend. A further 22 x DN 1600 circular
precast concrete pipes were supplied on request
in replacement of originally specified plastic pipes.

The project was originally specified with 2400
x 1500mm box culverts with dry weather flow
channels installed at the invert in three runs.

Stanton Bonna’s Site Support Technician, Chris
Taylor, assisted the contractors, PJ Towey
Construction Ltd, with on site training and support
before the products were delivered, as this was
the first time they had fitted this type of system.

Luke Martin and the consultant designers (Haigh
Huddleston) reviewed the project and systems
available.
0115 944 1448
40

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