Browsing by Author "Ahmed Mohammed"

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    Assessment Of Contractual Breaches and Delays in Road Construction Projects: A Case Study of The Arbereketi to Gelemso Road Project
    (Addis Ababa University, 2024-12) Ahmed Mohammed; Abraraw Chane(PhD)
    This thesis investigates the assessment of contractual breaches and delays in road construction projects, focusing specifically on the Arbereketi to Gelemso Road Project in Ethiopia. As infrastructure development is critical for economic growth, understanding the factors contributing to project inefficiencies is essential. The primary objective of this research is to identify the underlying causes of contractual breaches and delays, thereby providing insights for improving project management practices. Utilizing a quantitative and qualitative research approach, data was collected through questionnaires and document involving key stakeholders, including contractors, consultant and the Employer. The data is further Analysed statistically and thematically. The findings reveal that inadequate planning, frequent changes in project execution sequences, funding challenges, and regulatory issues significantly impede project progress, leading to cost overruns and extended timelines. The study concludes that effective contract management practices are vital for mitigating these challenges. Recommendations include prioritizing strategic planning, enhancing stakeholder communication, and implementing structured change management processes. By addressing these issues, stakeholders can improve the efficiency and sustainability of road construction projects in Ethiopia, ultimately benefiting local communities and contributing to national development goals Key Words: Road construction projects, Contractual breaches, Delays, Project management and Risk management
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    Assessment of Soil Erosion Risk in Lake Tana Sub-Basin Using Rusle and Gis, Upper Blue Nile, Ethiopia
    (Addis Ababa University, 2013-06-06) Ahmed Mohammed; Kebede Seifu (PhD)
    Land degradation in terms of soil erosion is a major environmental issue posing threat to sustainability livelihood in Tana Sub-Basin. This study attempted to assess soil erosion risk by using Revised Universal Soil Loss Equation and Geographic Information system and delineating deltas formed in the Lake Tana in spatial approach. Knowing extent and severity of the land is important as a decision support system to policy makers, resource managers as well as local communities and farmers. The result of this assessment showed spatial distribution of different soil erosion severity across the area and makes comparative assessment of the watersheds. In addition to this, soil erosion susceptibility was estimated through Revised Universal Soil Loss Equation (RUSLE). This model uses topographic factor, soil factor, rainfall erosivity factor, cover management and support practice factor as an input to map soil erosion risk areas. Satellite image of 1986 and 2011 year are used for the delineation deltas formed in the Lake Tana using PCA change analysis. Specifically, Satellite image of year 2011 is used for the development of Land Use/Land Cover to that is used for the development of Cover management and support practice factor. The research finds that More than 27% of the study area excluding the lake is highly susceptible to erosion risk and nearly 3% is very highly susceptible to erosion. In the same way, 20.77 % of the sub-basin is moderately susceptible to erosion in a range of 50-200t/ha/year. Nearly 50 % of the sub-basin is none to slightly susceptible to erosion. From the analysis of PCA change Gilgel Abbay river formed 588.4 ha delta while Gummera and Ribb rivers formed river delta by 11.91 ha and 14.77 ha respectively.