Mitigate the effects of flooding with an effective and reliable strategy

Mitigate the effects
of flooding with
an effective and
reliable strategy
www.hydro-int.com

Discover the strategic
steps you should take
with Hydro International
to improve your flood risk
mitigation strategy.
www.hydro-int.com2

Flooding is
an inevitable
fact of modern
urban planning
Climate change, changing
weather patterns and
construction of impermeable
areas is exacerbating natural
flood cycles.
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Flood damage is costly
A study published by
Nature Climate Change suggests
coastal flooding will cost the UK
€236BNevery year by 2100.
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On a personal level, the
average cost of repairing a
flood-damaged home in 2018 is
£30,000
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Evidence suggests that
flooding is worsening in terms
of severity and cost to the
economy. And the traumatic
effect on the individuals
affected too.
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The following five steps provide
a strategy for mitigating the
effects of flooding. We consider
costs, water storage, time to site,
and the current state of the local
environment.
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Identify
issues
1
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Isolate pluvial (surface) and
fluvial (riverine) causes of
flooding as well as potential
groundwater contributions.
Where appropriate, consider
factors like erosion, storm surges,
high tides and storm damage to
coastal defence structures.
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Surveys and models are
essential to determine
appropriate solutions
— particularly where
several factors interact.
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Assess
surroundings
2
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Assessing the surrounding
environment of at-risk areas
enables identification of
whether and how it can be
employed as part of a risk
mitigation strategy.
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Consider fluvial flooding. Natural flood
management schemes can be implemented
upstream, including:
Planting Improved soil
management
Restoration
of wetlands
The use of fallen
trees as dams
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Pluvial flooding is caused by overload of drainage systems,
often exacerbated by impermeable paving. In urban areas,
sustainable drainage systems (SuDS) are used to:
Slow the speed
of runoff
Divert collected
rainfall back into the
natural environment
Ease system
capacity
constraints
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SuDS solutions to
consider include:
Swales and
retention ponds
Permeable
paving
Flow control
systems
Underground
storage systems
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Balance
time, costs
and ease
of build
3
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Your ideal solutions will
balance overall cost of
the project with ease of
build and time to site.
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Achieving that balance
requires collaboration with:
Clients Regulators Key members of
the supply chain
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Collaboration needs
to be established at
the earliest stages of
the project.
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Consider
technologies
4
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Technologies that achieve
the principles of sustainable
drainage can also play a
significant role in diverting
and attenuating flooding.
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Vortex flow control systems
offer large-scale protection at
watercourse level, holding back
excess floodwaters in temporary
flood storage areas. When used
in drainage projects they provide
control and balancing of flow rates
and volumes across a catchment.
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Engineered
options include:
Embankments
and levees
Demountable
barriers and grass
floodwalls
Below-ground
storage
In-pipe storage
in oversized
collection
systems
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Pitfalls
5
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Flood mitigation measures can
create other problems:
Measures to hold water upstream
of an urban area may increase the
incidence of upstream flooding
Urban barriers may increase
the water speed and amount
of downstream erosion
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Advanced optioneering ensures
potential knock-on effects are
identified and eliminated. Running
computer simulations with the
proposed solutions in situ will help
to determine all onward effects.
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Design engineers and contractors
alike need to deliver a project that
fundamentally mitigates the effect of
flooding. With other responsibilities and
concerns such as time to market, budget
allocations and even climate change, it
is crucial to stay one step ahead.
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Your strategy must be built around
effectiveness and reliability. This
will help to plan for flooding
while remaining compliant with
environmental and regulatory
requirements all at the same time.
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When planning a strategy to mitigate the
risks of flooding, design engineers need
to scope out potential risks that their
environments pose, what could cause
flooding and what products or systems
would negate these risks best.
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Mitigate the effects of flooding with an effective and reliable strategy

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