Understanding Flood Vulnerability in the Deli Watershed

Oct 13, 2025 by pynkocean.com 104 views

Understanding Flood Vulnerability in the Deli Watershed

Flood vulnerability is a critical issue that affects many communities around the world, particularly in regions with high rainfall and dense population. In the Deli Watershed (DAS) of North Sumatra Province, understanding flood vulnerability is essential to mitigate the risks associated with flooding. This study aims to analyze the flood vulnerability levels of the Deli Watershed using the Weighted Overlay method, considering various parameters that affect the level of flood vulnerability.

Methodology

The Weighted Overlay method is a widely used approach in flood vulnerability analysis, which involves assigning weights and values to various parameters that affect flood vulnerability. In this study, the parameters analyzed include rainfall, land slope, soil elevation, soil type, land use, and river density. Each parameter is given a weight and value according to its classification. The overlay process is carried out using ArcGIS 10.8.1 software, which integrates remote sensing technology and geographical information systems (GIS) to analyze and present geographical data digitally.

Results and Discussion

The results of this study showed that almost all areas of Medan City, especially around the Deli River Basin, had a high level of flood vulnerability. Some of the main factors that cause this vulnerability include land slope, topographical humidity index, and land use. The area with a slope of 0-8% in most Medan City areas is categorized as very vulnerable to flooding. This is caused by a flat topography and high density of river flow, so that this area is at risk of becoming a water reservoir when it rains, which contributes to an increase in the risk of flooding.

Land Slope and Flood Vulnerability

The analysis of land slope shows that areas with a slope of 0-8% are highly vulnerable to flooding. This is because flat topography allows water to accumulate and flow easily, increasing the risk of flooding. In contrast, areas with a steeper slope are less vulnerable to flooding, as water flows quickly and does not accumulate.

Topographical Humidity Index and Flood Vulnerability

The topographical humidity index is another critical factor that affects flood vulnerability. The analysis shows that areas with a humidity index value of more than 14 are categorized as very vulnerable to flooding. This is because high humidity levels indicate a high risk of water accumulation and flooding.

Land Use and Flood Vulnerability

Land use is also an essential factor that affects flood vulnerability. The analysis shows that areas with land use for settlements and open land are classified as very vulnerable to flooding. This is because these areas are often densely populated and have limited drainage capacity, increasing the risk of flooding.

Case Studies

Two case studies were conducted to illustrate the flood vulnerability levels in the Deli Watershed. The first case study was conducted in the Sei Putih II area, Medan Petisah District, where the percentage of areas submerged in floods reached 41.16%. This area is highly vulnerable to flooding due to its flat topography and high density of river flow. The second case study was conducted in Tanjung Rejo Village, Sunggal District, where the area of inundation reached 67.05 hectares. This area is also highly vulnerable to flooding due to its flat topography and high density of river flow.

Implications and Recommendations

The flood vulnerability map produced from this study can be used as a tool to manage and mitigate flood risk in Medan City. Information about vulnerable locations can help the government and related parties in taking preventive steps and proper management, such as the construction of adequate drainage channels, land use arrangements, and controlling river flow. With these steps, it is hoped that the impact of the flood disaster can be minimized, so that the community can live more safely and more conveniently.

Importance of Flood Vulnerability Maps

The importance of flood vulnerability maps not only lies in the ability to predict flood-prone locations, but also on its ability to support better planning in the management of water resources and regional development. This analysis is expected to be a basis for better decision making, for the sake of safety and welfare of the community along the Deli River Basin.

Conclusion

In conclusion, this study has demonstrated the importance of flood vulnerability analysis in the Deli Watershed of North Sumatra Province. The results of this study have shown that almost all areas of Medan City, especially around the Deli River Basin, have a high level of flood vulnerability. The analysis of land slope, topographical humidity index, and land use has identified the main factors that contribute to flood vulnerability. The flood vulnerability map produced from this study can be used as a tool to manage and mitigate flood risk in Medan City. It is hoped that this study will contribute to better decision making and planning in the management of water resources and regional development in the Deli Watershed.

Q: What is flood vulnerability, and why is it important to analyze it?

A: Flood vulnerability refers to the likelihood of a flood occurring in a particular area. Analyzing flood vulnerability is essential to understand the risks associated with flooding and to develop strategies to mitigate those risks.

Q: What are the main factors that contribute to flood vulnerability in the Deli Watershed?

A: The main factors that contribute to flood vulnerability in the Deli Watershed include land slope, topographical humidity index, and land use. These factors can increase the risk of flooding by allowing water to accumulate and flow easily.

Q: How can flood vulnerability maps be used to manage and mitigate flood risk?

A: Flood vulnerability maps can be used to identify areas that are prone to flooding and to develop strategies to mitigate those risks. This can include the construction of adequate drainage channels, land use arrangements, and controlling river flow.

Q: What are some of the challenges associated with flood vulnerability analysis in the Deli Watershed?

A: Some of the challenges associated with flood vulnerability analysis in the Deli Watershed include the complexity of the terrain, the density of population, and the limited availability of data.

Q: How can the results of this study be used to inform decision making and planning in the management of water resources and regional development?

A: The results of this study can be used to inform decision making and planning in the management of water resources and regional development by identifying areas that are prone to flooding and developing strategies to mitigate those risks.

Q: What are some of the potential benefits of using flood vulnerability maps in the Deli Watershed?

A: Some of the potential benefits of using flood vulnerability maps in the Deli Watershed include reducing the risk of flooding, protecting lives and property, and promoting sustainable development.

Q: How can the public be involved in flood vulnerability analysis and management in the Deli Watershed?

A: The public can be involved in flood vulnerability analysis and management in the Deli Watershed by providing input and feedback on flood vulnerability maps, participating in public consultations, and supporting flood mitigation efforts.

Q: What are some of the next steps for flood vulnerability analysis and management in the Deli Watershed?

A: Some of the next steps for flood vulnerability analysis and management in the Deli Watershed include updating flood vulnerability maps, conducting further research on flood vulnerability, and implementing flood mitigation measures.

Q: How can the results of this study be used to support sustainable development in the Deli Watershed?

A: The results of this study can be used to support sustainable development in the Deli Watershed by identifying areas that are prone to flooding and developing strategies to mitigate those risks, promoting sustainable land use practices, and supporting the development of flood-resilient infrastructure.

Q: What are some of the potential applications of flood vulnerability maps in other regions?

A: Some of the potential applications of flood vulnerability maps in other regions include identifying areas that are prone to flooding, developing strategies to mitigate those risks, and promoting sustainable development.

Q: How can the public access flood vulnerability maps and information in the Deli Watershed?

A: The public can access flood vulnerability maps and information in the Deli Watershed through various channels, including online platforms, public consultations, and community meetings.

Q: What are some of the limitations of flood vulnerability analysis and management in the Deli Watershed?

A: Some of the limitations of flood vulnerability analysis and management in the Deli Watershed include the complexity of the terrain, the density of population, and the limited availability of data.

Q: How can flood vulnerability analysis and management be integrated with other planning and development initiatives in the Deli Watershed?

A: Flood vulnerability analysis and management can be integrated with other planning and development initiatives in the Deli Watershed by identifying areas that are prone to flooding and developing strategies to mitigate those risks, promoting sustainable land use practices, and supporting the development of flood-resilient infrastructure.