Journal of
Engineering and Technology Research

  • Abbreviation: J. Eng. Technol. Res.
  • Language: English
  • ISSN: 2006-9790
  • DOI: 10.5897/JETR
  • Start Year: 2009
  • Published Articles: 190

Article in Press

ASSESSMENT OF THE EFFECT OF POOR DRAINAGE SYSTEM ON ROAD PERFORMANCE: A CASE STUDY IN DIRE DAWA TOWN


  •  Received: 24 May 2019
  •  Accepted: 04 October 2019
Proper design, construction, and maintenance of road drainage structures are very essential especially for the urban drainage system because of it’s the adverse effect both on the road and the community in case flooding happen. The drainage system of the towns in Ethiopian commonly uses rational method for the estimation of design discharge which directly depends on rainfall intensity, runoff coefficients and catchment areas. The constructed or existed drainage structure was expected to carry the design discharge which generated from the catchment area and dispose safely to the out let points. The study has mainly focused in the assessment of the effect of poor drainage system on the road performance, specifically to assessing the current status of drainage system of the towns and its effect on the road, to evaluate the relationship of IDF curve intensity with different time period and compared with ERA IDF curve result, and to evaluate the hydraulic performance of the drainage system. The study was conducted in Dire Dawa Towns specifically in Keble 05, 03, and 02. A descriptive and exploratory way of expression has been used to assess the effect of poor drainage system and its effect on the road performance. The researcher uses both primary data source and secondary data sources, and the collected data has been analyzed and presented with Microsoft- excel, global mapper, HY-8, ARC-GIS 10.4,percentage values, graphs, and tables has been used. The rational methods for areas less than 0.5Km2 and SCS- methods for areas greater than 0.5Km2 has been to proposed the maximum discharge and HY-8 software also used for existed culvert analysis. The result shows that the current drainage status of the towns was poor, the computed proposed peak discharge and the existed working space of the drainage structure was compared and observed that the drainage structures are hydraulically insufficient. The prepared IDF curve for different scenarios (I30 year, I20 year, and I10 year) recorded rainfall has been compared and found that I30

Keywords: Poor drainage; Drainage; Road performance; Hydraulic Performance, IDF Curve