Use the AHP and GIS method

Oct 13, 2025 by magicalceylontours.com 75 views

Prevents Flooding in Medan City: Mapping Flood Vulnerability With the AHP Method

Introduction

Floods are one of the most devastating natural disasters that can occur in urban areas, causing significant material and immaterial losses for the community. In Medan City, the Deli Watershed (DAS) is particularly prone to flooding, which can have severe consequences for the residents and the local economy. To effectively manage and prevent flooding, it is essential to have accurate information about the areas that are most vulnerable to flooding. This study presents an innovative solution by combining the Analytic Hierarchy Process (AHP) and Geographic Information System (GIS) methods to map flood vulnerability in Das Deli.

Background

Floods in Medan City are often caused by a combination of factors, including river distance, elevation, slope, aspects, land use and land cover, rainfall, drainage density, and types of soil. Understanding the relative importance of these factors is crucial in determining the level of flood vulnerability in each region. The AHP method is a powerful tool for decision-making that can be used to determine the weight and priority of various factors that contribute to flooding. By integrating the AHP method with GIS, it is possible to produce flood vulnerability maps that can be used to guide flood prevention efforts in Das Deli.

Methodology

The AHP method was used to determine the weight and priority of various factors that contribute to flooding in Das Deli. The factors considered in this study include:

*** River distance: The closer to the river, the higher the flood potential.** *** Elevation: Low elevation areas are more susceptible to flooding.** *** Slope: Steep slopes increase the speed of water flow, thereby increasing the risk of flooding.** *** Aspects: The direction of the slope facing towards the coming of water flow can increase the risk of flooding.** *** Tata Use and Land Cover: Incorrect land use, such as development in water catchment areas, can increase flood potential.** *** Rainfall: High rainfall is the main factor causing flooding.** *** Drainage Density: Low drainage network density can cause inundation and flooding.** *** Types of soil: Types of soil that are less permeable can exacerbate flooding because water is difficult to seep into the ground.**

The data from these factors were then integrated into GIS to produce flood vulnerability maps. The maps display information about the level of potential flood vulnerability in each region, allowing for more effective management and prioritization of flood prevention efforts in Das Deli.

Results

The results of the analysis show that high rainfall is the most influential factor in causing flooding in the Deli watershed. Other factors, such as river distance, elevation, and land use, also have a significant weight in determining the level of flood vulnerability. The flood vulnerability map produced identifies 25 villages in the Das Deli which have a very high flood potential. Field validation shows that this map has succeeded in mapping areas that are indeed flooded, such as the Kelurahan Sei Goat C2, Aur, Kampung Baru, and Titi Kuning.

Discussion

This study demonstrates the effectiveness of the AHP and GIS method in mapping flood vulnerability in the city of Medan. By providing more accurate information about flood-prone areas, mitigation efforts can be carried out more directed and effectively to reduce the impact of flood disasters in the future. The flood vulnerability map produced in this study can be used as a guideline for flood prevention efforts in Das Deli, helping to protect the community and the local economy from the devastating effects of flooding.

Conclusion

In conclusion, this study presents an innovative solution for mapping flood vulnerability in Das Deli using the AHP and GIS methods. The results show that high rainfall is the most influential factor in causing flooding in the Deli watershed, and that other factors such as river distance, elevation, and land use also have a significant weight in determining the level of flood vulnerability. The flood vulnerability map produced in this study can be used to guide flood prevention efforts in Das Deli, helping to reduce the impact of flood disasters in the future.

Recommendations

Based on the results of this study, the following recommendations are made:

Use the AHP and GIS method to map flood vulnerability in other regions of Medan City.
Develop a flood early warning system that can provide timely warnings to the community about potential flooding.
Implement flood mitigation measures such as flood-proofing buildings, improving drainage systems, and restoring natural floodplains.
Conduct regular field validation to ensure that the flood vulnerability map is accurate and up-to-date.

By following these recommendations, it is possible to reduce the impact of flood disasters in Medan City and protect the community and the local economy from the devastating effects of flooding.
Frequently Asked Questions (FAQs) About Flood Vulnerability Mapping in Medan City

Introduction

Flood vulnerability mapping is a crucial tool for understanding and mitigating the impact of flooding in urban areas. In Medan City, the Deli Watershed (DAS) is particularly prone to flooding, which can have severe consequences for the residents and the local economy. In this article, we will answer some of the most frequently asked questions about flood vulnerability mapping in Medan City.

Q: What is flood vulnerability mapping?

A: Flood vulnerability mapping is a process of identifying areas that are most susceptible to flooding based on various factors such as river distance, elevation, slope, aspects, land use and land cover, rainfall, drainage density, and types of soil.

Q: Why is flood vulnerability mapping important?

A: Flood vulnerability mapping is essential for understanding the risk of flooding in a particular area and for developing effective mitigation strategies. By identifying areas that are most susceptible to flooding, authorities can take proactive measures to prevent or reduce the impact of flooding.

Q: What are the factors that contribute to flood vulnerability?

A: The factors that contribute to flood vulnerability include:

Q: How is flood vulnerability mapping done?

A: Flood vulnerability mapping is done using a combination of the Analytic Hierarchy Process (AHP) and Geographic Information System (GIS) methods. The AHP method is used to determine the weight and priority of various factors that contribute to flooding, while GIS is used to integrate the data and produce a flood vulnerability map.

Q: What are the benefits of flood vulnerability mapping?

A: The benefits of flood vulnerability mapping include:

Improved understanding of flood risk: Flood vulnerability mapping helps to identify areas that are most susceptible to flooding, allowing authorities to take proactive measures to prevent or reduce the impact of flooding.
Effective mitigation strategies: By identifying areas that are most susceptible to flooding, authorities can develop effective mitigation strategies to reduce the impact of flooding.
Reduced economic losses: Flood vulnerability mapping can help to reduce economic losses by identifying areas that are most susceptible to flooding and taking proactive measures to prevent or reduce the impact of flooding.

Q: How can flood vulnerability mapping be used in practice?

A: Flood vulnerability mapping can be used in practice in a variety of ways, including:

Flood risk assessment: Flood vulnerability mapping can be used to assess the flood risk in a particular area and to identify areas that are most susceptible to flooding.
Flood mitigation planning: Flood vulnerability mapping can be used to develop effective flood mitigation strategies and to identify areas that require additional flood protection measures.
Emergency preparedness and response: Flood vulnerability mapping can be used to develop emergency preparedness and response plans, including evacuation routes and emergency shelters.

Q: What are the limitations of flood vulnerability mapping?

A: The limitations of flood vulnerability mapping include:

Data quality: The accuracy of flood vulnerability mapping depends on the quality of the data used, including the accuracy of the topographic data and the rainfall data.
Model complexity: The complexity of the flood vulnerability model can affect the accuracy of the results, particularly if the model is not well calibrated.
Scalability: Flood vulnerability mapping may not be scalable to larger areas, particularly if the data is not available at a sufficient resolution.

Conclusion

Flood vulnerability mapping is a crucial tool for understanding and mitigating the impact of flooding in urban areas. By identifying areas that are most susceptible to flooding, authorities can take proactive measures to prevent or reduce the impact of flooding. This article has provided an overview of flood vulnerability mapping, including the factors that contribute to flood vulnerability, the methods used to map flood vulnerability, and the benefits and limitations of flood vulnerability mapping.