Browsing by Author "Zerihun Muleta"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Evaluation of Recharge and Groundwater flow Dynamics in Beles Basin, Upper Blue Nile Basin, Northwestern Ethiopia
    (Addis Ababa University, 2023-10) Zerihun Muleta; Tenalem Ayenaw
    The demand for groundwater is growing, leading to the identification of this valuable resource as the focal point for investigation, administration, and preservation. The Beles basin's groundwater resources and groundwater dynamics have been both quantitatively and qualitatively analyzed in this work. Therefore, evaluating groundwater recharge and groundwater flow dynamics utilizing Wetspass,baseflow separation and chloride mass balance approaches was the primary goal of the current research project. The annual recharge of the basin is predicted to be 223.40 mm/year based on the results of the Wetspass model, which corresponds to around 13.86% of the annual rainfall that infiltrates into the aquifer. The model also shows that around 36.35% of the total annual precipitation is accounted for by direct runoff. Furthermore, the Main Beles River at Beles Bridge and the Gilgel Beles river catchments near Mandura town were selected as the primary rivers for assessing the recharge process within the Beles basin. Through baseflow separation, it was determined that the basin experiences an annual recharge of 203.52 mm/year, accounting for 12.63% of the total annual rainfall that replenishes the aquifer. Interestingly, the basin exhibits higher baseflow during the summer months due to increased precipitation and higher evapotranspiration rates. The baseflow index, which indicates the contribution of groundwater to rivers, is highest during the rainy season and lowest during the dry season. Lastly, the chloride mass balance method was employed to estimate groundwater recharge in the area. The findings revealed chloride concentrations of 0.74 mg/L in rainfall and 4.93 mg/L in groundwater. As a result, the CMB method determined that the groundwater recharge in the Beles catchment is approximately 241.9 mm/year, which corresponds to 15% of the annual precipitation that infiltrates into the groundwater reservoir. By examining groundwater level readings from 3 boreholes, 12 shallow wells, 16 hand-dug wells, and information from 89 springs, the groundwater flow dynamics is controlled by surface morphology and structures and flows from the northeast towards the west, aligning with the flow of the Beles River.
  • No Thumbnail Available
    Item
    The Role of Performance Audit on Performance Improvement and Accountability in the Audited Public Sectors of City Government of Addis Ababa
    (Addis Ababa University, 2019-06) Zerihun Muleta; Degefe Duressa
    The main objective of this research project is to assess the role of performance audit on performance improvements and accountability in some of the selected audited public sectors in the City Government of Addis Ababa. The study has employed descriptive research method. Survey method has used to conduct this descriptive research. Closed ended questionnaires using Likert 5 scales distributed to these some selected public sectors on which performance audits had conducted from the year 2016 to 2018. The data collected have analyzed using Microsoft excel which is appropriate for this descriptive statistics. For statistical interpretation, mean have used. Based on the data analysis made and results obtain the selected audited public sectors for this research on which performance audit conducted have positive or good perceptions on the performance audit. They also have positive or good perceptions on the auditors’ performance audit recommendations given by the performance auditors but improvements that they made in implementing performance audit recommendations were small or slight. The findings also show that activities performed by the legislature or ‘council’ from viewpoint of the audited public sectors were small or slight and the media participation in performance audit report from viewpoint of the selected audited public sectors were average or moderate. The study has concluded that performance audit has not resulted in significant role on performance improvements and on accountability in these selected public sectors on which performance audit has conducted. Audited public sectors should make performance audit recommendations implement and be result in performance improvements in these selected audited public sectors. Activities of the legislature and the media on audit report findings should also be more perform to increase role of performance audit on accountability.