Hillingdon SuDS Design & Evaluation Guide

9.3.3 Supporting information
Depending on the nature of the scheme
various investigations, tests and calculations
may need to be performed along with
obtaining necessary consents:
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Ground investigation, including infiltration
test results, soil testing and groundwater
monitoring as appropriate.
Design calculations which demonstrate
compliance with the design criteria for the
site including all hydraulic and structural
calculations for permeable pavements
and underground storage structures as
appropriate.
Completion of standard design
information forms as may be provided by
the LPA.
Details of any offsite works required,
together with any necessary consents in
place (or can be obtained).
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near a main river (including where the
river is in a culvert), works on or near a
flood defence or for works in the flood
plain of a main river; Ordinary
Watercourse Consent (LLFA) for any
structure with the potential to affect flows
in an ordinary watercourse; highway drain
(Highways Authority); or with Sewerage
Undertaker for any connections to the
public sewer. Discussions should be held
with EA for Infiltration within Source
Protection Zone areas or higher risk sites;
Local Authority and Inland Drainage
Board byelaws, comments and
constraints.
Proposed maintenance schedule and
confirmed management arrangements for
all non adopted drainage. Identify any
proposed split of the SuDS between
private (curtilage) and public (open space
or highway) land.
Detailed Design
72
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Confirmation that discharge consents are
in place (or can be obtained):
Environmental Permit (Environment
Agency) - an Environmental Permit may
be required for works in, under, over or
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Designers hazard and risk assessment- to
consider construction, maintenance and
operation by personnel and day to day
site use by public.
Details of any informative signage
proposed for SuDS.
London Borough of Hillingdon SuDS D & E Guide
© 2018 McCloy Consulting & Robert Bray Associates