module 5 flood risk assessment

8/13/2019 Module 5 Flood Risk Assessment

1/14

FLOOD RISK SSESSMENT

Training Course onFactoring Hydro-Climatic Disasters in IWRM


2/14

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


3/14

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.


4/14

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.


5/14

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


6/14

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


7/14

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.


8/14

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.


9/14

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


10/14


11/14

IFM PERSPECTIVE

1

1

Structure

EconomicEfficiency Endurance

EnvironmentalSustainability

ManagementInstruments

EnablingEnvironment

InstitutionalFrameworks

Balance flood for livelihoods and flood as a resource

Principles


12/14

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


13/14

PPRO CHES TO FLOOD CONTROL


14/14

THANK YOU FOR YOUR ATTENTION

module 5 flood risk assessment

Documents