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