SuDS in London - a guide

Heat island
Describes urban built up areas that are
significantly warmer than surrounding rural
areas.
Highways Agency
The government agency responsible
for strategic highways in England, ie,
motorways and trunk roads. This function
is devolved to Transport Scotland,
Department of Economy and Transport
in Wales and the Northern Ireland
Roads Service.
Highways authority
A local authority with responsibility for
the maintenance and drainage of highways
maintainable at public expense.
Hydrodynamic vortex
Storm water management device that uses
cyclonic separation to control
water pollution. It uses flow-through
structures with a settling or separation
unit to remove sediment from surface
water runoff.
Hydrology
The branch of science concerned with
the properties of the earth’s water,
and especially its movement in relation
to land.
Impermeable
A material that does not allow liquids or
gases to pass through it.
Impermeable surface
A surface that does not allow water to
pass through it, thus generating a surface
water runoff after rainfall.
Infiltration (to the ground)
The passage of surface water into
the ground.
Infiltration basin
A dry basin designed to promote
infiltration of surface water to
the ground.
Inundation
An overwhelming amount of water
resulting in a flood.
Linear assets
Linear infrastructure such as pipes, roads,
rail, canals, etc.
LUL
London Underground Limited.
Media
Natural topsoils, subsoils and
manufactured soils.
Micropool
Pool at the outlet to a pond or wetland
that is permanently wet and improves the
pollutant removal of the system.
Mini-Hollands
TfL programme to transform three outer
London boroughs (Enfield, Kingston &
Waltham Forest) to prioritise walking and
cycling while improving the quality of the
urban realm.
Monetised costs & benefits
These are easy to understand and measure
financially, eg, the price of
land or reduced damage (tangible) costs to
property.
Monitoring plan
Sets out the approach, timing and
resources to monitor measures adopted.
Multifunctional space
An area that has more than one use, one
being to manage surface water.
National Standards for
Sustainable Drainage
A regulatory document providing
standards and guidance on the design,
construction and maintenance of SuDS
for approval and adoption by the SuDS
Approval Body.
143 Appendices