Abstract:
Drainage system is designed to collect storm water runoff from the roadway surface
and right-of-way, convey it along and through the right-of -way, and discharge it to an
adequate receiving body without causing adverse on-or off -site impacts. Storm water
drainage problem is one of the major challenges facing many countries in Ethiopia in
general and Wolaita sodo town also faced the problem. This study has investigated the
challenges of assessment on the adequacy of the urban surface drainage system and its
impact on pavement performance in wolaita sodo town.The objective of this study is
to investigate the adequacy of existing urban surface drainage systems in Wolaita
soddo town. Furthermore, spatial analyses were conducted using Arc GIS,Google
Earth pro,Eagle Point and Auto CAD software‟s as analytical tools. The existing
depth and width of the storm water drainage channel were measured for all sub
catchments of the study area of the town and used to determine the existing urban
surface drainage capacity using topographic map of town. The hydrological analysis
was computed by the SCS method and rational method. The computed discharge
values, which were determined by both SCS method and rational method, were
compared by dividing the watershed area according to their area of application.The
existing urban surface drainage channel design discharge was increased from
1.75m3/s to 17.8m3/s .
This research seeks to provide valuable insights into the interplay between drainage
systems and pavement performance ultimate contributing to the development of
sustainable urban infrastructure.
