More about ’why external drainage is required, if eco friendly
permeable driveway, path and road surfaces are used’. There’s a
few more things to say here. The North West of England should
take the lead in terms of building eco friendly driveways,
paths, roads and carparks Within any development, regardless of
the external surfacing, there’s an underground drainage system
to take away foul and waste water from the buildings (sinks,
toilets etc.), which connects to the public sewers and ends up
being carried away to processing plants for filtration etc. and
reuse. This underground system within and outside of the site is
the same sewer system external surface water from roofs, ground
etc. is discharged to – so even if there were no requirement for
a piped system to get rid of rain water there would still need
to be a system in place. The only visual difference being that
you wouldn’t see drainage channels, grates, gullies etc. on the
road surfaces if a site were discharged solely using eco
friendly permeable s