Performance Assessment of Road Drainage Systems of Burayu Town
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Date
2017-03
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Addis Ababa University
Abstract
The objective of the study is to assess the Performance of Drainage Systems of Road at Burayu
Town Administration. The study employed both primary and secondary data collection. The
primary data collection were observation (field visit), Interview, and photographs that show the
existing drainage structure conditions and information that were gathered from the residents
about the performance of the drainage structures during the rainy season. The secondary data
sources were land cover map and geological map. Hydrological analysis was carried out by
using Rational and SCS equations. Hydraulic parameters were determined from the design
documents data during construction and from the construction sites by measuring the
parameters where the structures are constructed by using Manning’s equation and GIS was used
for watershed delineation. The findings of the study that were investigated includes: In most part
of the town, runoffs run over road surfaces were due to soil erosion, flatness of the ditch channel,
poor waste management system and lacking of the drainage structure at some station. As there is
no adequate provision for garbage container in the town, residents dispose wastes in to the
drainage channels, culvert, open spaces, and rivers/ streams. The drainage channels are filled
with or blocked by silt and garbage, the blockage of drainage structures is due to flat areas and
siltation of drainage system which leads to failures on roadways. The computed discharge values
which were determined by both SCS methods and rational method were compared by dividing
the watershed area according to their area of application. At station 16+200 the discharges
were computed by SCS method for 60ha and also, computed by rational method by divided 60ha
into two parts 30ha/0.3km2 and compared the results. The hydraulic calculation was carried out
at station 16+200 by using Manning equation and checked by trial and error. Therefore, the
design and check discharges at station 16+200 are 17.0m3/sec and 21.5m3/sec respectively.
Therefore, new drainage structure will be needed at station 16+200. Therefore, this study
recommends improvement in the integration of road and drainage structures serve for the
intended purposes sustainably to the stakeholders.
Keywords: Drainage Structure, Urban Road, Flooding, Blockage, Maintenance
Description
Keywords
Drainage Structure, Urban Road, Flooding, Blockage, Maintenance