Hillingdon SuDS Design & Evaluation Guide

Limited pipe capacity,
as well as blockage,
can cause local
flooding
Trees and plants are at risk
of drought, due to lack of
rainwater.
Overview
12
‘Flashy’ flows can
cause erosion of
watercourses
Quick conveyance of
rainwater from site can
increase the risk of
flooding elsewhere.
Recharge of
groundwater and
aquifers is prevented,
and ‘baseflows’ to
watercourses are lost.
Pollution can be
washed into
streams, rivers
and the sea.
Hydrocarbons and
tyre crumb are
examples.
Conventional drainage results in high rates and
increased amounts of runoff reaching streams
and rivers. Pollution from urban surfaces is also
washed into watercourses.
London Borough of Hillingdon SuDS D & E Guide
© 2018 McCloy Consulting & Robert Bray Associates