Page 25 - Croydon

Overview 5.3 The objectives of the 5.4 SuDS design is considered 5.5 SuDS design is evaluated at each subsequent design stage Overview

evaluation process
at the beginning
The basic requirements of amenity and
All aspects of SuDS design should be
evaluated at each design stage.
biodiversity must be demonstrated at each
In the past, drainage was usually considered
Throughout the various design stages the
design stage.
emerging designs should be evaluated
at the end of the design process, with a
The management of flows and volumes and
against core design criteria relating to the
site layout. In many respects the pipe
four main objectives of SuDS design: piped drainage solution superimposed onto a the location of attenuation storage should be Health and safety must be considered at
each design stage, with confirmation that this
indicated to an appropriate level at the
quantity, quality, amenity and biodiversity. infrastructure was independent of the Concept, Outline and final Detail Design has been achieved through the ‘safety by
topography, geology and other hydraulic and stages. design’ principle (see section 8.5).
The objectives of the evaluation process are
environmental characteristics of the site.
to ensure that SuDS: Similarly, the design will demonstrate the use In the same way, effective, safe and cost-
Sustainable drainage, however, must be of appropriate source control measures, effective maintenance of the SuDS scheme
■ meet mandatory (NSTS) and LPA
requirements for water quantity and integrated into the site design. It should conveyance and other SuDS components and will be ensured through careful design at
reflect the topography, geology and drainage how these are arranged in a management every stage.
quality, amenity and biodiversity
characteristics of the site together with the train with discreet sub-catchments.
■ maximise opportunities for multi- character of the landscape.
functionality and amenity uses
SuDS Concept Design ensures that SuDS can
■ enhance biodiversity throughout the influence the layout of the development and

development is a key part of pre-application discussions.

■ integrate into the development’s layout
and design Design Note:
As SuDS components don’t manage water most of the time, avoid colouring them blue on
19 ■ are appropriate, cost-effective and robust plan. Blue is best used for denoting permanent water bodies, like ponds and wetlands. 20

■ are practical to maintain in the long term.
A wetland at Fort Royal Primary School, The ‘swale maze’ at Redhill School is usable as a
Worcestershire, enhances biodiversity within play and education space when it’s not raining
the school grounds. and even in small rainfall events.

Croydon Council SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates Croydon Council SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates