vulnerability & risk hazard mapping

VULNERABILITY & RISK HAZARD MAPPING

RISK ASSESMENT

What is a Risk Assessment ?

• A methodology to determine the nature and extent of risk by analyzing potential hazards and evaluating existing conditions of vulnerability that together could potentially harm exposed people, property, services, livelihood and the environment on which they depend

Hazard Exposure Vulnerability Impact

Hazard Risk Terminology

Hazard Likelihood and intensity of a potentially destructive phenomenon (earthquake, floods)

Determined by nature

exposure Location and value of things that are important to us(lives , property)

Determined by people

vulnerability Likelihood that assets will be damaged or destroyed when exposed to a hazard event

risk Likelihood that things we value will be harmed

Considerations for Hazard Risk Assessment

• What is intended purpose of the hazard/risk assessment? e.g building codes, land use planning, disaster management training etc.

• Who are the end users? e.g engineers, urban planners, disaster managers, local community, financial planners etc.

• What data sets exist to support the assessment? e.g land use, building types, historical event catalogue etc.

Styles of Hazard Risk Analysis

Vulnerability

Vulnerability is dependent on

The exposure to the hazardThe sensitivity to the impactThe resilience to recover from the consequences

No simple, universally accepted method to assess vulnerability (yet)

Vulnerability: The inability to anticipate, cope with and recover from a natural disaster, such as a flood or storm :

Example: income as indicator for vulnerability

Vulnerability formula

In which:V = VulnerabilityE = ExposureS = SensitivityC = Coping Capacity (or Resilience)

Approach Towards Risk Assessment & Management • Multi Hazard Risk Assessment Frame Work

Risk = f (Hazard, vulnerability )

Risk = f (Hazard, vulnerability, capacity )

Risk = f (Hazard, vulnerability, preparedness )

3D- Approach

Hazard MappingCase study

Vulnerability & Hazard Warning Mapping Tool

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Several GIS layers are being prepared in a buffer of 20km across the Indus River from Chashma down to delta where it merges with sea. In addition to this the Nowshera and right bank of Indus river in Sindh is also being covered

GIS Layers:

Settlements RoadsEmbankments Railway line Bridges Agriculture land

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Draft Web Portal

•Pre-Disaster (Preparedness)

• Interactive GIS tool• Risk mapping at

district level • Vulnerability

assessment • Evacuation plans• Safest route

identification •Post Disaster (Response)

• Damage assessment

• Damage Need Analysis

• Information dissemination

Draft Web Portal

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Draft Web Portal

Flood hazard mapping

• Flood Forecast• Flood Early Warning

• Hazard Mapping• Visualize Layers

• Download Maps

Downloads• Maps

• Other products

Use rri simulated output for hazard mapping and perform gis analysis for damage assessment

Mapping – Download Maps• Flood Forecast

• Flood Early Warning

• Hazard Mapping• Visualize Layers

• Download Maps

Downloads• Maps

• Other products

Use rri simulated output for hazard mapping and perform gis analysis for damage assessment

Download – Maps

• Flood Forecast• Flood Early Warning

• Hazard Mapping• Visualize Layers

• Download Maps

Downloads• Maps

• Other products