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Flood Assessment and Control in Hargeisa, Somaliland: A Community-Based Perspective
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11 January 2024
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12 January 2024
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Abstract
Flooding during the rainy season poses a significant threat to the city of Hargeisa, impacting the well-being of both its residents and the local ecosystems. This research focuses on urban flood control, with a specific emphasis on finding sustainable solutions for managing large stream in Hargeisa. The study identifies five key dimensions, including infrastructure, transportation, environmental soil, life, and property, as critical factors in addressing the issue. By employing a comparative method and collecting data through closed-ended questions, the research aims to analyze and weigh eleven potential solutions, seeking to identify the most effective approaches.
The findings of the study indicate that constructing a dam emerges as a promising and sustainable solution, with a weightage of 70 percent. This highlights the potential of a dam in mitigating the impact of floods in the region. Additionally, considering the government's economic capacity, the implementation of check dams is identified as another viable option, with a weightage of 95 percent for reducing the flood power of the stream. These solutions offer practical and effective measures to address the recurring problem of flooding in Hargeisa.
To support future decision-making and planning, the research underscores the need for establishing a comprehensive rainfall data database. This database would store relevant information on rainfall patterns, enabling better understanding and prediction of flood events. The study emphasizes the importance of collaboration between local government authorities, environmental organizations, and stakeholders to develop and implement effective flood control strategies. This research provides a systematic approach that can inform and benefit regional and global researchers, policymakers, and municipal governments in their efforts to address urban flood control challenges, not only in Hargeisa but also in similar contexts worldwide.
Keywords:
Subject: Environmental and Earth Sciences - Water Science and Technology
Introduction:
The global perspective on flood control in urban environments recognizes the significant challenge of urban flooding and emphasizes an integrated approach. In my opinion Floods, while natural phenomena causing significant damage to the environment, people, and agriculture, also have benefits, such as providing water resources, supporting biodiversity, and contributing to agricultural productivity, especially in regions like the Horn of Africa, which is susceptible to various natural disasters. Public participation in flood prediction and management decisions in Brazilian cities, considering various drainage solutions and best practices, is essential for effective flood control, addressing public perceptions, and integrating expert knowledge with public understanding (Nascimento et al., 2008). Rapid urbanization in urban areas worldwide has led to increasing flood risks, necessitating a combination of flood control measures and comprehensive risk assessments to minimize economic losses and effectively manage flood risk through a holistic approach that considers various factors and integrates flood simulation and damage assessment (Li et al., 2016) .The integration of various tools, techniques, and data gathering methods enables a thorough assessment of flood risks, aiding in informed decision-making and the formulation of suitable flood management strategies (Rubio et al., 2020). With climate change and urbanization posing significant challenges, urban flooding, responsible for a substantial portion of climate disaster-related fatalities, necessitates sustainable stormwater management strategies, supported by urban flood models that employ quantitative and deep learning approaches, emphasizing the need for ongoing research to address comprehensive flood hazard mitigation (Qi et al., 2021).
Methodology:
This study employed a community-based participatory research (CBPR) approach to investigate flood assessment and control measures in Hargeisa.
Figure 1.
Study Area.
CBPR is a collaborative research approach that empowers community members to participate in all phases of the research process, from problem identification to data collection and interpretation (Nascimento et al., 2008).
A questionnaire survey was conducted with 83 community members residing in neighborhoods adjacent to the main valley that often experience flooding. The questionnaire explored respondents' perceptions of flood risks, their experiences with floods, and their preferred flood control measures.
Data Analysis:
The data collected was analyzed using descriptive statistics to summarize the respondents' responses. The frequency of flood occurrences, the perceived severity of flood impacts, and the most favored flood control measures were identified.
Results:
The findings reveal that floods have a significant impact on the lives and livelihoods of Hargeisa residents. Nearly 87% of respondents reported that floods have caused severe damage to their homes and property. Additionally, floods have disrupted transportation, damaged infrastructure, and exacerbated soil erosion.
Figure 2.
The extent of the flood's impact on transportation.
Figure 3.
the impact rate of soil erosion.
Figure 4.
The extent of the flood's impact on infrastructure.
The questionnaire also revealed that respondents overwhelmingly support stream control, dam construction, and tree planting as effective flood control measures. These measures were perceived as being more cost-effective and sustainable than traditional hard engineering approaches, such as concrete dams and levees.
Figure 5.
Planting more trees in the valleys and waterways inside and outside the city will reduce the potential for flooding.
Figure 5.
Planting more trees in the valleys and waterways inside and outside the city will reduce the potential for flooding.
Figure 6.
Streams are the main source of floods, if streams are controlled the floods will stop completely by constructing check dams.
Figure 6.
Streams are the main source of floods, if streams are controlled the floods will stop completely by constructing check dams.
Figure 7.
Making the valley one big dam is the most important solution for flood control.
Conclusion:
The findings of this study highlight the importance of community engagement in flood assessment and control efforts. Community members are often the most knowledgeable about local flooding patterns and can provide valuable insights into effective mitigation strategies. CBPR can foster a sense of ownership and responsibility among community members, leading to more sustainable and effective flood management initiatives.
Based on the study's findings, the following recommendations are proposed for flood risk management in Hargeisa:
- Develop a comprehensive flood risk management plan that incorporates community participation and a combination of hard and soft engineering measures.
- Implement stream control measures, such as check dams and channelization, to regulate water flow and reduce flood risks.
- Construct small dams to store excess floodwater and release it in a controlled manner.
- Encourage tree planting to increase infiltration capacity and reduce surface runoff.
- Improve drainage infrastructure to facilitate the efficient
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