Environmental Engineering Reference
In-Depth Information
Coastal
Flooding
River
Flooding
Current
responsibility
Environment Agency
Strategic Overview Role
Current
responsibility
Advice on maps, modelling
and plan in plates and
load information on
defence assets
British
Waterways
Water
companies
Information
on cards
and
discharge
structures
Information
on drainage/
sweeming
assets and
modeling
SURFACE
WATER
FLOODING
Information
on internal
drainage
board district
assets
Information
on secure
water
processing
models
Internal
Drainage
Boards
Information on local plaining
and development and
other infrastructure including
defence and disharge assets
Met Office
Local
Authorities
Local
Authority
Scrutiny
Committees
Load on the collation of source
information and production
Ensure that
actios within
the plan are
carriedout
Overly
assurance
role to ensure
acuracy and
consistancy
Surface
Water Management
Plans
Environment
Agency
Fig. 13.1
Key stakeholders with responsibilities in flood risk management. From Pitt (2007).
of the performance of the integrated urban drain-
age system.
Planning is also a key regulatory driver, andnew
planning guidance, in the form of PPS25 (2006),
sets out UK government policy on building and
construction development and flood risk. CIRIA
(Balmforth et al. 2006) outlined best practice ad-
vice for the design and management of urban
sewerage and drainage systems to reduce the im-
pacts that arisewhen the flows exceed the capacity
of the system and of ways to adapt the existing
system to accommodate the excess flows.
The EU Water Framework Directive has the
specific aim to mitigate the effect of floods and
droughts, and the EU Floods Directive (E 2007)
required that preliminary flood risk assessments
are completed to identify areas at risk, with the
subsequent development of flood hazard and flood
risk maps for areas at risk and the publication of
flood risk management plans by December 2015.
FRMRC has attempted to address many of the
shortfalls in knowledge that impede the develop-
ment of such risk maps, but first it is necessary to
understand the mechanisms of the types and
causes of urban flooding.
Urban drainage systems
In respect of urban flooding, reference is made to
the major and minor components of the drainage
system, where three components of a combined
system are defined:
. Minor system: - the underground sewerage or
drainage network that is designed for dry weather
flow and storm flows of a given return period and
duration. This includes gully inlets, local drain-
age, sewer pipes, culvertedwatercourses, CSO and
storage structures, pumping stations and outfalls.
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