EVALUATION OF URBAN DRAINAGE MANAGEMENT IN TABOR SUB CITY, HAWASSA

Abstract

Drainage management related problems in Hawassa City has become an eye burning issue during the rainy seasons in recent years. This study deals with the evaluation of urban storm drainage management in the Tabor sub city, Hawassa town. The data were collected from primary and secondary sources. The primary sources field survey, field observation, direct field measurement, direct field data collection using questionnaires and interviews, and a comparison of the design of the storm drainage systems were carried out. The data were analyzed the questionaries’ and field measurement using SPSS & Microsoft-excel. The results of this study show that the problem in the study area is caused by; ineffective storm drainage management systems, lack of proper drainage network linkage, lack of proper interconnection between the drainage infrastructures there by result flooding problem in the area and unfitting inlet spacing. Blockage of storm drainage canals due to the accumulation of silt and urban solid waste which created inadequate hydraulic capacity of drainage infrastructures to convey the generated floods. The storm drainage canals efficiency related problems technical, social and maintenance related problem were the main problems for the existed storm drainage canals to convey the generated floods. The study suggests that could be used to achieve sustainable and effective urban drainage management, which would support the government’s effort in upgrading the drainage management system into one department; urban drainage management services by preparing plans, feasibility studies and effectively manage the urban drainage infrastructure. This study strongly recommends improvement in the integration of urban drainage infrastructure, storm drainage and solid waste management.