Page 77 - Updated SuDS Design & Evaluation Guide-Newham V3 Spreads

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Detailed Design 9.3.3 Supporting information ■ ■ Thames Water consent to discharge to Detailed Design

Depending on the nature of the scheme
public sewer if sewer connection is
various investigations, tests and calculations
required. Refer to Thames Water advice
may need to be performed along with
on the process required to apply for
obtaining necessary consents:
discharge consent.
■
Ground investigation, including infiltration
Proposed maintenance schedule and
monitoring as appropriate.
all non adopted drainage. Identify any
■ test results, soil testing and groundwater confirmed management arrangements for
Design calculations which demonstrate
proposed split of the SuDS between
compliance with the design criteria for the
private (curtilage) and public (open space
site including all hydraulic and structural
or highway) land.
calculations for permeable pavements
and underground storage structures as ■ Designers hazard and risk assessment- to
appropriate. consider construction, maintenance and
operation by personnel and day to day
■ Completion of standard design
site use by public.
information forms as may be provided by
the LPA. ■ Details of any informative signage
proposed for SuDS.
■ Details of any offsite works required,

together with any necessary consents in
place (or can be obtained).
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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
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; or highway
drain (Highways Authority). Discussions
should be held with EA for Infiltration
within Source Protection Zone areas or
Plan excerpt: proposed new Holyoaks Primary School, Redditch. higher risk sites; Local Authority and
The detail design stage confirms the layout, character and function of
the SuDS, Including detailed levels, volumes, flow controls and Inland Drainage Board byelaws,
component design. comments and constraints.

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