CDRA 3: Develop Exposure Data Base

Summary

This instructional video from the Department of the Interior and Local Government Central Luzon highlights the importance of developing an exposure database for Comprehensive Disaster Risk Assessment (CDRA). The video guides viewers through creating exposure maps and collecting data on elements at risk, such as population, urban areas, critical facilities, and infrastructure. Emphasizing the use of GIS software, secondary data, and interviews, the video provides practical steps for generating accurate maps and calculating exposure scores to support disaster risk management efforts in local communities.

Takeaways

• 😀 The exposure database is crucial in the Comprehensive Disaster Risk Assessment (CDRA) process, as it serves as the basis for hazard analysis.
• 😀 Ensuring high-quality data is essential for accurate analysis, as 'garbage in, garbage out' applies to exposure data.
• 😀 The main outputs of this stage include exposure maps and attribute information on the elements at risk, such as population and urban areas.
• 😀 Exposure maps should be generated using accurate and updated data, often through Geographic Information Systems (GIS) software.
• 😀 Secondary data from surveys, studies, and census data should be prioritized over expensive new data collection methods.
• 😀 When creating exposure maps, overlay hazard maps with land use maps to identify areas and structures exposed to specific hazards.
• 😀 Five key exposure units to consider are: population, urban use areas, natural resource-based production areas, critical point facilities, and lifeline utilities.
• 😀 For population exposure, use updated household maps or socio-economic data to calculate the number of people at risk.
• 😀 Urban use area exposure should include residential, commercial, and industrial zones. Using building and replacement cost data is critical for analysis.
• 😀 For natural resource-based production areas, use land use and resource maps, and calculate the value of affected production areas based on average output per hectare.
• 😀 Critical point facilities (CPFs) and lifeline utilities, such as roads, water, and power distribution, are integral to understanding vulnerability, requiring maps of infrastructure and updated data on affected areas.

Q & A

What is the importance of developing the exposure database in the CDRA process?

The exposure database is critical because it provides the foundational data for analyzing hazards. The maps and information generated in this step help assess areas and structures at risk, guiding disaster risk management efforts.

What types of data should be included in the exposure database?

The exposure database should include exposure maps and attribute information. This includes data on elements at risk such as population, urban use areas, natural resource-based production areas, critical point facilities, and lifeline utilities, along with their location, sensitivity, and adaptive capacity.

Why is it important to ensure the quality of data used in the exposure database?

Ensuring the quality of data is essential because inaccurate or outdated information will lead to poor analysis, resulting in incorrect risk assessments. This can compromise disaster preparedness and response strategies.

What are some sources for gathering data to build the exposure database?

Data can be sourced from both primary and secondary sources. Primary sources include interviews and field surveys, while secondary sources include recent studies, census data, and existing maps.

What role does GIS software play in the creation of exposure maps?

GIS software is used to overlay hazard maps with land use maps, helping to visualize which areas are exposed to specific hazards. This tool helps generate accurate spatial data and provides a clearer picture of vulnerability.

How can the exposure of population areas to a hazard be mapped?

Population exposure can be mapped by overlaying hazard maps with residential area maps. GIS software can help categorize areas by susceptibility, and information like population density and residential allocations are used to assess exposure.

What is the significance of urban use area exposure maps?

Urban use area exposure maps show which parts of the built environment—such as residential, commercial, and industrial areas—are at risk from hazards. These maps help prioritize areas for mitigation and resource allocation.

How are the affected values of urban use areas determined?

Affected values of urban use areas are determined by calculating the affected building area and multiplying it by the estimated replacement cost. This can be done using maps and data from local engineering or building offices.

What data is needed to assess the exposure of natural resource-based production areas?

To assess exposure in natural resource-based production areas, you need data on land use, crop types, production output, and the number of farming dependents. This information can be obtained from agriculture offices and other local authorities.

What is meant by 'critical point facilities' and why are they important in the exposure database?

Critical point facilities (CPFs) are essential services such as schools, hospitals, and power plants. They are important because their disruption can have significant social and economic impacts. Mapping CPFs helps assess their vulnerability to hazards and plan for their protection.

How can exposure maps for lifeline utilities be created?

Exposure maps for lifeline utilities, like roads and water networks, are created using updated maps of infrastructure. Roads, water, and power distribution networks are overlaid with hazard maps to identify exposed areas, and data on construction costs helps estimate the affected value.