SuDS in London - a guide

maintain its integrity and function. Over
time, detritus collects in the upper part of
the joint material and surface pores. This
build-up can affect infiltration capability.
The performance and appearance of
permeable surfacing in areas where buses,
taxis and delivery vehicles stand may be
affected by leaking engine oil.
The maintenance regime of permeable
paving is largely dependent on the
construction of the surface course.
Brushing and joint material renewal is
required, the frequency being determined
by local conditions. The exact type of
jointing grit will vary depending on the
product system and contractors will need
to take account of this. Weeds will need
to be removed from joints, unless
wildflower establishment is part of the
design concept.
Useful design guidance
CIRIA C753 The SuDS Manual, Chapter 20
Interpave, the Precast Concrete
Paving and Kerb Association –
see www.paving.org.uk
De-paving the margins of an existing pathway to increase permeability
56 3 SuDS components