Investigation on Storm Drainage Problem of Addis Ababa (Case Study at Gotera – Wollo Sefer, Saris - Gotera and Ring Road
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Date
2011-07
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Addis Ababauniversity
Abstract
Proper drainage system is required in developing urban areas. In Addis Ababa, drainage problem
become an issue during rainy season. This study deals with investigation of storm drainage
problem of Addis Ababa and a possible mitigation measure to overcome the problem. Despite
there are many places in the city facing storm drainage problem; Ethio china road (Gotera –
Wollo sefer), Saris Gotera road (Debrezeit road) and Ring roads are areas selected for this study.
Based on primary and secondary data collected, the problems in the areas are categorized as
construction, management and design problem. The method used to investigate management
problem is direct field data collection and site visit but the construction problem is analyzed
using field survey as well as comparison of design with what is implemented in the ground.
Design of the study area is evaluated by redesigning of the system using the computation sheet
used in American Federal Highway Administration (FHWA) urban drainage design manual and
Addis Ababa City Road Authority (AACRA) urban drainage design manual with some
modification. Design of storm drainage system evaluated in this research includes inlet spacing,
pipe sizing and inlet type selection. The Values of inlet spacing and pipe sizing obtained by
redesigning is compared with the original design.
The result of this paper shows that the problem in Gotera - Wollo Sefer and Ring road is caused
by insufficient drainage operation, over spaced inlet spacing and minimum pipe size is used. The
investigation in Saris – Gotera road also shows; the curb inlets are over spaced and constructed
with very small opening, the operation system of the drainage is in sufficient and curbs are not
constructed according to the design.
Finally, based on the result obtained a possible mitigation measures is recommended
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Keywords
Storm Drainage Problem