www.wwtonline.co.uk | WWT | AUGUST 2015| 15 www.wwtonline.co.uk | WWT | AUGUST 2015| 15
from Bath, the system will schedule
transfers at the most efficient time
to ensure security of supply while
minimising energy costs.
"The Optimiser soware that
Wessex Water has developed with
Tynemarch is an automated, online,
closed-loop optimal network control
system," says Modley. "It will control
the flows along the line of the trunk
main that we have built. It will ensure
water quality, security of supply and
manage the transfer of water along
the line of the main cost-efficiently."
Another innovation involves
the water sources at risk of high
nitrate levels, and the way existing
infrastructure around them is to
be used. The supply grid has been
designed to allow the existing nitrate
removal water treatment works and
low nitrate water supply sources to be
fully utilised, by the targeted blending
of the available low nitrate water
with sources at risk of exceeding the
nitrate standard. This has been done
by careful segregation or twinning
of pipework to allow for blending at
critical points.
"The grid allows us to make the
most of the assets and resources we
have got," says Modley. "It's about
maximising our resources rather than
having to build new boreholes or
treatment plants."
Construction is expected to be
completed in late 2016, allowing the
system to be tested comprehensively
in 2017 and commissioned by the start
of 2018.
A diagram of the Water Supply Grid projects
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.
