Hillingdon SuDS Design & Evaluation Guide

9.7.5 Water quality design checklist
Item
What is being checked
Method of Sensitivity of receptor and level of
discharge treatment required
Treatment Sufficient treatment in place protecting
site biodiversity and amenity assets and
the wider environment.
Evidence of source control, subcatchments
and management train.
Infiltration Presence of SPZ’s, contaminated land,
depth to seasonal high groundwater table.
Information presented for
assessment
Design statement to specify method of
discharge and sensitivity of receptor.
Layout drawing clearly indicating SuDS
components and management train.
Details of Indices approach and
infiltration screening assessment (as
appropriate).
Coordinated constraints plan. Evidence
of discussion with EA where appropriate
Detailed Design
Construction
Demonstration of how site runoff could be
Section of the drainage design
phase
managed during construction to minimise
the risk of pollution to the wider
statement outlining a potential approach
for construction runoff management.
environment due to silty construction
Contractors will be responsible for
runoff.
uptake.
Operation and
Operation and maintenance should be
Concise operation and maintenance
maintenance
plan
simple to understand and easy to
implement. Where available, SuDS design
should deploy natural treatment process
plan. Description of tasks and detailing
of where personnel are required to visit
site to remove hydrocarbon based
106
to breakdown organic pollutants passively.
pollutants (i.e. organic pollutants have
Contingency measures in the event of a
minor / major spillage
not been fully broken down passively as
part of SuDS treatment process).
Plan indicating potential for containment
and positioning of spill kits (as
appropriate)
London Borough of Hillingdon SuDS D & E Guide
© 2018 McCloy Consulting & Robert Bray Associates