Module 5 Flood Risk Assessment
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Transcript of Module 5 Flood Risk Assessment
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FLOOD RISK SSESSMENT
Training Course onFactoring Hydro-Climatic Disasters in IWRM
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Explain the occurrence, impact and assessment offloods as a natural phenomenon.
Outlines the risk reduction measures and practicesthat can be used to build the resilience of the localcommunities for coping with Floods at thecatchment level.
Learning Objectives:
To understand types, factors and indicators offloods
To understand severity and risks associated withfloods
To establish a basis for flood management as a
GO L
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INTRODUCTION
Flood is a general and temporary
condition of partial or complete inundation
of normally dry land areas from:
o the overflow of inland waters, and
o the unusual and rapid accumulation of runoff
of surface waters from any source.
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FLOOD M N GEMENT
Flood management is a broad conceptthat focuses on reducing flood hazardsthrough a combination of policy,institutional, regulatory and physicalmeasures, while recognizing that floodscan never be fully controlled
This takes into account the beneficialuses of floods, which are difficult toquantify in human and economic terms
but which sustain natural systems thatalso have economic, social, cultural andecosystem values and functions.
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FLOOD RISK M N GEMENT
A change to proactive management of naturaldisasters requires an identification of the risk,the development of strategies to reduce thatrisk, and the creation of policies and
programmes to put these strategies into effect
Risk management is a fundamental activitygeared to the evaluation of schemes forreducing but not necessarily eliminating theoverall risk, as in many cases risk cannot beentirely eliminated
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FLOOD RISK M N GEMENT Steps associated with risk assessment and management
includes
Assessing the potential for a hazard to occur
Vulnerability analysis to provide an understanding of the
consequences should an event of a certain magnitudeand frequency occur.
Based on this initial work, various mitigation measures
evaluated to assess their ability for reducing risk
exposure Disaster management plans and specific mitigation
measures can be identified
Efforts then be undertaken to implement the selected
mitigation measures
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FLOOD RISK ND VULNER BILITY SSESSMENT
A basin floodmanagement plan has to
start with assessing the
present and future flood
risks. Flood risks arefunction of;
magnitude of the hazard,
degree of exposure to
the hazard and vulnerability of society
against damage due to
the hazard.
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UNDERST NDING FLOOD H Z RD ND FLOODING
This may require;
hydro meteorological analysis;
hydrologic and hydraulic simulation of
surface runoffs, floods and inundations; mechanism of flooding;
simulation and analysis projected conditionsof land use change, future developments
(e.g., urbanization, infrastructuredevelopment etc;
future trends of hydro-meteorologicalphenomenon due to climate variability or
change.
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INTEGRATED FLOOD MANAGEMENT-A NEW APPROACH
Integrated Flood Management(IFM)is aprocess that promotes an integrated,rather than fragmented, approach to floodmanagement.
It integrates land and water resourcesdevelopment in a river basin, within thecontext of integrated water resources
management (IWRM), and aims tomaximize the net benefitfrom floodplainsand to minimize loss to life from flooding.
14/01/20149
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IFM PERSPECTIVE
1
1
Structure
EconomicEfficiency Endurance
EnvironmentalSustainability
ManagementInstruments
EnablingEnvironment
InstitutionalFrameworks
Balance flood for livelihoods and flood as a resource
Principles
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SUPPORTIVE TECHNOLOGIES
A number of tools are available to array anddisplay information for
the use of technical experts,
to explain programmes of flood damage reduction
to the decision-makers, and to communicate real time forecasts and warnings
to the public.
These include; Geographic Information Systems (GIS)
Mapping
Visualization techniques
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PPRO CHES TO FLOOD CONTROL
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THANK YOU FOR YOUR ATTENTION