Page 27 - Haringey SuDS DESIGN & EVALUATION
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■ Slowly permeable, seasonally wet slightly Due to the urban nature of Haringey and the
acid but base-rich loamy and clayey soils density of proposed developments, the most
(most of the borough is of this soil type sustainable solutions are mostly green and
related to London Clay) blue roofs, porous paving and rain gardens
integrated into landscaping.
■ Loamy and clayey floodplain soils with
naturally high groundwater (Tottenham The requirement for solar PV panels is not an
Hale and Lea Valley) obstacle to greens or blue roofs and both can
integrate together. Tank and crate solutions Local SuDS requirements
■ Freely-draining, slightly acid loamy soils
are discouraged as maintenance and lifetime
(north Tottenham, parts of Tottenham costs can be prohibitive.
Hale)
A large area in the east of Haringey is within
■ Loamy soils with naturally high
a Source Protection Zone (SPZ), there are
groundwater (parts of Highgate).
areas of contamination in this area, which will
Rainfall in clay areas runs off quickly into the require site-specific solutions. Early
rivers as water is unable to penetrate into the engagement with drainage officers will
ground. The interaction between required for these sites.
groundwater and surface water is generally
prevented due to the presence of London Due to prevalence of London Clay in
Haringey, infiltration is not always possible
Clay.
however, soakage tests should be carried out
Local SuDS Specific Requirements on site to determine the existing rate of
infiltration.
Sustainable drainage systems (SuDs) have 22
been integrated into major projects across To allow LLFA to assess SuDs proposal
Haringey. The combination of urban creep Haringey’s Flows and Volumes Technical
and climate change has put increasing Assessment Pro-forma must be completed
pressure on the existing drainage system. prior to the submission of a planning
Equally, the polluted nature of runoff from application.
the drainage measures in our streets places Local LPA and Stakeholder Engagement
additional strain on the water environment in
rivers. Early consultation before the planning
process is started is strongly encouraged for
SuDs must continue to be incorporated to all types of development through pre-
alleviate the pressure on drainage systems
and rivers. Slowing and cleaning water can application discussions with the Local
Planning Authority (LPA). This is particularly
create a more resilient built and natural
environment over time. A number of the important in relation to major schemes where
SuDs need to be incorporated into the
higher Critical Drainage Areas are present in
Haringey, which require consideration in SuDs overarching design. Haringey’s pre-
application SuDs form should be completed
design.
prior to initial meetings.
London Borough of Haringey SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates
