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Detailed Design 9.3.3 Supporting information near a main river (including where the Detailed Design
Depending on the nature of the scheme
river is in a culvert), works on or near a
various investigations, tests and calculations
flood defence or for works in the flood
may need to be performed along with
plain of a main river; Ordinary
obtaining necessary consents:
Watercourse Consent (LLFA) for any
■
Ground investigation, including infiltration
structure with the potential to affect flows
monitoring as appropriate.
(Highways Authority); or with Sewerage
Undertaker for any connections to the
■ test results, soil testing and groundwater in an ordinary watercourse; highway drain
Design calculations which demonstrate
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
71 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.
Plan excerpt: proposed new Holyoaks Primary School, Redditch.
The detail design stage confirms the layout, character and function of
the SuDS, Including detailed levels, volumes, flow controls and
component design.
Croydon Council SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates Croydon Council SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates
