How to Prepare a Risk Map?
From Howtopedia - english
Contents |
Preparation of Risk Maps
Introduction
This document addresses the risk maps that resulted from the experience carried out in the emergency preparedness project in Peru. The methodology will have to be revised according to other more comprehensive risk reduction experiences and strategies that are being implemented institutionally but that lack instruments such as the one described here.
Conceptual approach
Risk map prepared by a member of the community
Outline for the preparation of risk maps by using geographic information systems
How are threat maps prepared?
1. Initial inputs
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Low: |
Expresses minimal values and does not constitute a potential threat |
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Medium: |
Expresses intermediate values and could constitute a potential threat |
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High: |
Expresses high values and constitutes a threat |
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Very high: |
Expresses very high values and constitutes an extreme threat |
For example
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A community which is located on a steep slope and receives a lot of precipitation in thesummer months is considered at a value of 4, whereas the same community in a slightly flatarea, but also receiving precipitation is considered at a value of 1. |
5. Validation of the landslide map in workshop and preparation of the final version.
How are vulnerability maps prepared?
1. Initial inputs
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• Completion of the vulnerability forms. • Preparation of a database. • Preparation of the vulnerability map taking into consideration three aspects: • Accessibility to vehicles and transportation, telephone and radio communication. • Basic services in houses, such as electrical power, potable water, sewers, and construction materials of the houses (wood, thatch, tiles, and corrugated iron) • Capacity of local institutions (parishes, schools, municipalities, mothers' clubs, health stations, self-defence committees)
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Low: |
Expresses minimal values and does not constitute a potential threat |
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Medium: |
Expresses intermediate values and could constitute a potential threat |
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High: |
Expresses high values and constitutes a threat |
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Very high: |
Expresses very high values and constitutes an extreme threat |
For example
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One of the vulnerability variables is the difficult access to communities. Roads are unpaved andonly four are suitable for motor vehicles, which gives those communities that only have unpavedunsuitable roads a value of 4. Another community located in a slightly flat area and also receiving precipitation is considered at avalue of 1. |
4. Producing the vulnerability map
What are risk maps used for?
• Risk maps allow the identification of the location of the risks and threats.
• They offer authorities and organisations ideas, shared with the community and experts, to make decisions and know what the existing dangers and threats are.
• All local stakeholders take part, analyse, and allow us to understand their perception of the situations.
• Maps allow registering historical events that have negatively affected the community.
• They help to prepare for emergencies.
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For more information: |
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