Hillingdon SuDS Design & Evaluation Guide

Detailed Design
9.11 SuDS Components
Competent design and detailing of SuDS
components ensures that runoff is collected,
conveyed, cleaned, stored, controlled and
discharged from site in an effective manner.
The general principles of SuDS component
design are considered in the SuDS Manual
2015 Sections 11-23. The purpose of this
section is to outline some of the key
considerations, experiences and practical
detail solutions of commonly used SuDS
components garnered over many years by
the authors.
Source Controls providing storage
Providing storage throughout the site
(distributed storage components), means
that every opportunity for storage across the
site is exploited, greatly reducing the overall
volume and size of site controls.
Source controls remove most silt, heavy
metals and heavy oils from runoff, allowing
basins, wetland and ponds to be designed as
site assets.
■■
■■
green/ blue roofs
raingardens
123
The following classifications are not rigid, for
example a permeable pavement can be
considered as both source control and site
control where it provides the required site
storage:
Strutts Centre, Belper.
A retrofit downpipe shoe and
brick channel into a raingarden.
■■
■■
bioretention
permeable pavements
Collection and connection
Where runoff is collected from roofs,
conveyance to the SuDS component may be
required. Historic urban design shows us a
number of surface collection methods
including spouts, surface channels and rills.
How runoff is collected and conveyed under
crossing points such as footpaths and roads
is a primary consideration of any SuDS
design. Design details such as road gullies
can artificially increase the depth and cost of
SuDS.
■■
■■
■■
channels & rills
filter strips
pipe connections
London Borough of Hillingdon SuDS D & E Guide
© 2018 McCloy Consulting & Robert Bray Associates