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Concept Design 7.5 Concept information required for SuDS evaluation 7.5.2 Preliminary water quantity considerations Concept Design
The information required at the Concept Design stage will depend on the type
At the Concept Design stage it is necessary
to show how runoff is collected and how it is
and scope of the proposed development.
stored within the development:
7.5.1 Pre-application discussion
Constructive discussion between the LPA,
■
■
Approximate storage volumes should be
The designer will confirm whether
the LLFA, Thames Water and the SuDS
provided for each location where flows
Approach 1 or Approach 2 is being used,
The design team will provide a Concept
designer will save the developer time and the
are attenuated.
Design for a pre-application design meeting,
cost of potential re-design, providing
managed.
or as preliminary design information should a
planners with reassurance that the project
pre-application meeting not be appropriate.
sub-catchments and along the
A reduction in the volume of rainfall
that is delivered will meet local planning ■ and confirm how volumes are being ■ Storage will be demonstrated within
Pre-application discussions with the LPA and expectations. discharged from the site will be management train, with the location of
LLFA provide an opportunity for the designer demonstrated by ‘interception losses’ and flow controls confirmed.
to confirm the preliminary requirements for long-term storage, where this is
the SuDS design, and for the evaluation team appropriate (Approach 1).
to understand the objectives and character The discussions will be informed by the ASA
of the SuDS proposed for the development. (Association of SuDS Authorities) NSTS for
Sustainable Drainage: Practice Guidance.
Design Note:
Ideally runoff should be stored in shallow landscape features. Where this is not possible,
http://www.susdrain.org/files/ deeper tank or pipe storage must be justified.
resources/other-guidance/lasoo_non_
49 statutory_suds_technical_standards_ 50
guidance_2016_.pdf Two shallow raingardens provide storage at Measham
A sunken SuDS courtyard with solar water feature Leisure Centre. Robust ground cover should persist
into a formal rill at Bromsgrove Civic Centre. (ASA were formally known as LASOO) through winter in order to protect soils.
Newham Council SuDS D & E Guide © 2020 McCloy Consulting & Robert Bray Associates Newham Council SuDS D & E Guide © 2020 McCloy Consulting & Robert Bray Associates
