IRJET - A Case Study on Flood Risk Management

A CASE STUDY ON FLOOD RISK MANAGEMENT
M. Ranjitham1, S. Bharani Devi 2, J. Dhanusuya3
1Assistant Professor, Department of Civil Engineering,
Bannari Amman institute of technology, Erode, Tamil Nadu, India
2,3Student, Department of Civil Engineering,
Bannari Amman institute of technology, Erode, Tamil Nadu, India
---------------------------------------------------------***--------------------------------------
Abstract:
Risk management has been considered as a well defined procedure for handling risks due to natural,
environmental or man-made hazards, of which floods are representative. Risk management can be carried
out on three different levels of actions. The first level is the operational level, which is related to operating an
existing system. The second level is a project planning level, which is used when a new or a revision of an
existing project is planed, and a project design level, which is embedded into the second level and describes
the process of reaching an optimal solution for the project. As the value system of a nation changes, and as
the natural boundary conditions are modified by human actions or global changes, an existing system will be
found not meeting the demands of the present society. The decisions for change depend on the changes in
options available for handling a flood situation, as well as on the changes in risk perception and attitudes
towards risk. On the third level, the actual cost of a design are evaluated and compared with the benefits
obtained from the planned project. In particular, on this level the residual risk is considered, i.e. the risk
which remains even after a project is completed and fullyoperational.
KEYWORD: man-made hazards, operational level, project planning level, design level.
INTRODUCTION
Flood risk is one of the most
devastating natural hazards that cause lack of
lives, damage to houses, resources and
environmental degradation in urban regions
over 3000 flood failures to place in a span of two
decades formed 1990-2010 and are chargeable
for the mise of 200 people and making 3 billion
humans homeless within the worlds. It is
predicted that on common nearly 200 million
people in more than 90 nations are exposed to
catastrophic flood activities every year and its
miles predicted to upward thrust in destiny
because of climate change and the consistent
demographic boom, in addition to of
urbanization (UNESCO, 2008). A crucial
difficulty for world natural hazards is the
technology of efforts, techniques, rules and
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 07 Issue: 02 | Feb 2020 www.irjet.net p-ISSN: 2395-0072
© 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1759

packages of the world wide governments at
diverse ranges to mitigate the flood occurrences.
The endurance occurrences of flood activities
except the measure under taken indicates the
lack of ability of flood manipulate measures to
properly manage floods. A sustainable flood
threat control calls for flood risk evaluation to
pick out forces and factors inflicting capability
flood risk. The quantity of medical books,
studies, reviews and research packages focused
on floods and their prevention is countless. In
the Web of Science Core Collection Database, we
recognized a total of 28,348 publications written
among 1900 and 2016 containing “flood(s)”
within the title of which fifty five% were posted
within the last 10 years. However,
notwithstanding growing know-how and
understanding at the challenge, the impact of
flooding continues to intensify. This impact is
measured by means of growing charges, with
the aid of feelings of inability to put into effect
powerful prevention measures and by way of
the belief, whether or not or now not its miles
justified, that the intensity and frequency of
flooding is increasing each year.
2 LEVELS OF ACTIONS
2.1 OPERATIONAL LEVEL
World-huge flood failure accounts for
approximately a third of all herbal screw ups,
via range and monetary loosed. The dying toll in
2013 was 10,000 people. The monetary damage
in 2013 due to flooding turned into 50 billion US
bucks. Climate alternates will boom the
probability of excessive occasions, while
populace growth and financial improvement,
especially in delta regions, will increases the
capacity effects of flooding. Government
authorities convey a big obligation. A stable
operational flood management infrastructure
will permit governments to reply correctly,
fending off damage and saving lives. Densely
populated regions are at a high chance for flash
floods, buildings, highways, driveways, and
parking masses boom runoff through lowering
the quantity of rain absorbed through the
ground. This runoff increases capability for a
flash flood.
2.1.1 INFORMATION AT RIGHT TIME AND
APPROACHES
Deltares has enormous quantity of
understanding in the subject of operational
flood management, linking disciplines including
hydrology, hydraulics, dikes era, arithmetic,
probabilistic and tender abilities in
communications and social sciences. As a result,
we are in position to create new ideas and
equipment that concentrate on our client’s
wishes, supplying actual, correct, reliable and
sensible facts that may be utilized in flood
situations. Together with our customers we
tailor our approaches to consist of and employ
present tools and information streams, and to
broaden new competencies.
Deltares additionally affords
recommendation about emergency response
measures, using forecasts and flood scenarios to
make sound and effective selection about which
measures to take. An important feature of our
consultancy paintings is our sound knowledge of
the wishes of both selection makers and
responders, inclusive of the addressing of
uncertainty within the statistics to hand.

2.1.2 FLOOD FORCASTING STRUCTURES
Providing expert consultancy services
and engaging in research worldwide. The Delft-
FEWS Software program has been applied in
over 35 countries and in lots of instances
(consisting of America, England & Wales and the
Netherlands), it's far the legit countrywide flood
forecasting device. Further to the improvement
of flood forecasting structures for predicting
river discharges and water tiers, Deltares has
additionally evolved a tool, DAM Live, to
evaluate the power and stability of flood
defences, which has been carried out in the
Netherlands and China. These gears permit
decision-makers to make sound and effective
selections. During a disaster state of affairs,
critical and brief selections are required. At
times like this, get right of entry to all the right
applicable data and the high-quality tailor-made
visualizations is vital. The Deltares interactive
information research laboratory (ID-Lab)
combines and displays all of the applicable
information for a selected task at a particular
second.
2.1.3 24/7 EMERGENCY RESPONSE
CONSULTANCY SERVICE
In several countries, Deltares has
additionally supplied specialist advice in the
course of predominant flood events, such as the
Thai floods of 2012. In the Netherlands, Deltares
additionally gives a 24/7 emergency response
consultancy service, with as much as a hundred
and fifty specialists, for the Dutch authorities.
Internationally, Deltares key professionals are
listed for emergency missions.
2.2 PROJECT PLANNING LEVEL
2.2.1 DAMS
Many dams and their associated
reservoirs are designed completely or partially
to useful resource in flood protection and
manipulate. Many huge dams have flood-
manipulate reservations in which the level of a
reservoir must be stored under a sure elevation
before the onset of the wet/summer time soften
season to permit a positive quantity of area
wherein floodwaters can fill. Other useful makes
use of dam created reservoirs consist of
hydroelectric electricity technology, water
conservation, and recreation. Reservoir and dam
construction and layout is based upon
requirements, typically set out with the aid of
the government. In the US, dam and reservoir
layout is regulated through the United States
Army Corps of Engineers (USACE). Design of a
dam and reservoir follows recommendations set
by the USACE and covers topics along with
design glide rates in attention to meteorological,
topographic, stream flow, and soil records for
the watershed above the structure.
The term dry dam refers to a dam that serves
merely for flood manipulate with none
conservation garage (e.g. Mount Morris Dam,
Seven Oaks Dam).
2.2.2 DIVERSION CANALS
Floods may be controlled with the aid of
redirecting excess water to motive-built canals
or flood ways, which in turn divert the water to
transient preserving ponds or different bodies of
water where there is a lower chance or impact
to flooding. Examples of flood control channels
consist of the Red River Floodway thatprotects

the City of Winnipeg (Canada) and the
Manggahan Floodway that protects the City of
Manila (Philippines).
2.2.3 FLOODPLAINS AND
GROUNDWATER REPLENISHMENT
Excess water may be used for
groundwater replenishment by using diversion
onto land that can absorb the water. This
method can lessen the effect of later droughts
with the aid of the use of the ground as a natural
reservoir. It is being utilized in California, in
which orchards and vineyards may be flooded
without unfavourable crops, or in other
locations desolate tract areas have been re-
engineered to act as floodplains.
2.2.4 RIVER DEFENCES
In many countries, rivers are
susceptible to floods and are regularly
cautiously managed. Defences which include
levees, bunds, reservoirs, and weirs are used to
save you rivers from bursting their banks.
A weir, additionally called a low head
dam, is most usually used to create millponds,
however at the Humber River in Toronto, a weir
turned into constructed close to Raymore Drive
to prevent a recurrence of the flood damage due
to Hurricane Hazel in October 1954.
2.2.5 COASTAL DEFENCES
Coastal flooding has been addressed
with coastal defences, consisting of sea walls,
seashore nourishment, and barrier islands.
Tide gates are used at the side of dykes
and culverts. They can be placed on the mouth of
streams or small rivers, where an estuary starts
off evolved or in which tributary streams, or
drainage ditches connect with sloughs. Tide
gates close at some stage in incoming tides to
save you tidal waters from moving upland, and
open in the course of outgoing tides to permit
waters to empty out thru the culvert and into
the estuary aspect of the dike. The starting and
closing of the gates is driven through a
distinction in water level on either facet of the
gate.
2.2.6 SELF-FINAL FLOOD BARRIER
The self-closing flood barrier (SCFB) is a
flood defences system designed to protect
human beings and assets from inland waterway
floods resulting from heavy rainfall, gales or
rapid melting snow.[citation needed] The SCFB
may be constructed to protect residential
houses and entire groups, as well as commercial
or different strategic regions. The barrier gadget
is constantly geared up to install in a flood
scenario, it is able to be hooked up in any period
and makes use of the rising flood water to
install.
2.2.7 TEMPORARY PERIMETER
OBSTACLES
When everlasting defences fail, an
emergency measure which includes sandbags or
inflatable impermeable sacks is used.
In 1988, a method of the use of water to
govern flooding became discovered. This was
done by using containing 2 parallel tubes within
a third outer tube. When crammed, this
structure shaped a non-rolling wall of water
which can manage eighty percentage of its peak
in outside water intensity, with dry floor at the
back of it. Eight foot tall water stuffed

limitations had been used to surround Fort
Calhoun Nuclear Generating Station during the
2011 Missouri River Flooding. Instead of
trucking in sandbag fabric for a flood, stacking it,
and then trucking it out to a hazmat disposal
web page, flood control can be finished by
means of using the onsite water. However, those
aren't fool proof. A eight feet (2.4 m) high 2,000
toes (610 m) long water stuffed rubber flood
berm that surrounded portions of the plant
turned into punctured by a skid-steer loader and
it collapsed flooding a portion of the ability.
2.3 DESIGNING LEVEL
2.3.1 CHECK DAMS
 These are small gravity dams,
usually constructed with rocks
and mortar or concrete, of
valuable height and width.
 These types of structures are
located in small or medium
sized gullies to stabilize
riverbeds slopes and prevent
soil erosion.
 Check dams, project gullies
from being eroded by rainfall
and runoff impact.
2.3.2 RETAINIG WALLS
These are rock or concrete block
structures built on steep slopes anywhere in the
watershed, where the erosion of the base
foundation threatens lands and homes.
2.3.3 BUNDING
Bunding is the general name used in
Jamaica for flexible structures of variable
thickness and length, composed of galvanized
wire mesh, stone, and wild-cane and riverbed
materials.
Bunding is used to prevent bank erosion and
landslips and to protect agricultural lands from
being flooded.
2.3.4 BUILDING REGULATION
 Approved document C, Site
training and resistance to
contaminants and moisture,
shows that after building in
flood susceptible areas, homes
may be built to mitigate some
of the outcomes of flooding.
 Elevated groundwater levels or
glide of subsoil water across
the web page may be alleviated
by the provision of good
enough sub-soil drainage.
 Sewer flooding due to backflow
or surcharging of sewers or
drains can be addressed
through the use of non-return
valves and anti-flooding
devices.
 Intrusion of groundwater
through flooring may be
addressed through using
waterproof production.
 Where there's a chance of the
access of water into floor voids,
provision to check out and
clean out sub-floor voids may
be considered.
3. FLOOD RISK MANAGEMENT ACT
The Flood and Water Management
Act was introduced on 8 April 2010 to

implement Sir Michael Pitt’s recommendations
following the widespread flooding of 2007 when
more than 55,000 homes and businesses were
flooded.
The Act requires
better management of flood risk, it creates
safeguards against rises in surface
water drainage charges and
protects water supplies for consumers. It gives a
new responsibility to the Environment
Agency for developing a National Flood and
Coastal Risk Management Strategy, and gives a
new responsibility to local authorities,
as Lead Local Flood Authorities (LLFA's), to co-
ordinate flood risk management in theirarea.
4. POSSIBLE SOLUTIONS
The following solutions can protect
buildings located in flood-prone areas and
prepare people, buildings and installations for a
possible flood:
 The buildings can be designed in such a
way that they can withstand a flood and
be used again after a thorough cleaning.
This requires waterproof construction
and well-considered materials,
equipment and infrastructure.
 The buildings can be sealed by means of
bulkheads and hatches.
 The buildings can be built on raised
ground.
 The buildings can be designed tofloat.
 Communication and information must
be regulated. Buildings must also be
evacuatable.
 The utilities within buildings can be
designed in such a manner that they are
able to withstand a flood.
 Making buildings self-reliant allows
them to be independent of the network
infrastructure.
 Also at the district level there are
options such as surface elevation,
floating areas, buildings on stilts,
temporary dams, autonomous or raised
infrastructure, and emergency refuges.
5. CONCLUSIONS
From the previous discussion it is clear
that the safety aspects must be considered by
the pharmaceutical industry not in the interest
of the employees or property but also in the
terms of the neighbouring environment as well.
The source of possible hazards, risk analysis,
control procedures, preventive measures and
contingency plan are the main five essentials for
ensuring a complete work atmosphere in
industry. Risk assessment is a powerful tool for
evaluating strategies to reduce disease and for
prioritizing future research needs. Because we
cannot inspect our way to food safety food
assessment should be an integral part of food
safety policy. Scientists, risk managers and
policy makers need to work together to develop
a food safety system that is both responsive and
proactive in addressing threats to our food
supply. Evaluation of risk management options
is the weighing of available options for
managing a food safety issue in light of scientific
information on risks and other factors, and may
include reaching a decision on an appropriate
level of consumer protection. In this current
consultation, the experts were being asked to
address a central issue in food safety. Risk
management, he observed, involve both, he
identification of the standards of acceptable risk
appropriate to different types of food hazards,

Research Organization, Bangalore,
Woodard, Colin (2001-09-
1983, Disasters in India — can remote
Response. Emergency Response
and the establishment of procedures to ensure
that the risks are kept within the limits set by
those standards.
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December,02, 2015 from:

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