In 1858, Joseph Bazalgette built a new sewerage system for London. It extended 82 miles
and required 670,000m³ concrete. Victorians didn't talk about sustainability but they
certainly knew how to build things that last. New legislation requires owners to manage
their sustainable drainage systems to function over the lifetime of a development, which
means building with materials that endure. That wouldn't have bothered Bazalgette and
it shouldn't bother you.
For more about sustainable drainage systems in concrete visit www.concretepipes.co.uk
Sustainable
Drainage
Systems.
Ask a man
who built one.
20 | NOVEMBER 2015 | WWT | www.wwtonline.co.uk
Potential savings of up to
£137.99 per linear metre*
*Figure quoted is the difference between Class S (Plastic Flexible Pipe) and Class
N (Concrete Rigid Pipe) costs, based on a DN1800 pipe. Potential cost savings
are based on normal ground conditions, including granular bedding costs of £15
per tonne and cost of material being taken off-site to landfill at £6 per tonne (figure
shown is independent of pipe costs). The bulk density of granular bedding material
is assumed to be 2.0 and for excavated material is assumed to be 2.1
For further details on the materials cost calculator visit the CPSA website:
www.concretepipes.co.uk/calculators/material-cost
Did you know?
Using the correct pipe bedding
class could save you a fortune
Plastic Flexible Pipe with full granular
surround (Class S Bedding)
Concrete Rigid Pipe
(Class N Bedding)
