Evaluation of Causes and Mitigation of Landslide in Harsu Area, Uraga Woreda, Guji Zone, Southern Ethiopia

Abstract

In Ethiopia, the magnitude of landslide occurrence and its resulting damage has been
increasing in recent times. The aim was to undertake comprehensive inventory of landslides,
evaluate the geological, and engineering geological condition, and state the main factors
causing landslides and develop hazard zonation map of study area. Analytical Hierarchy
Process method were used to analyse, evaluate and interpret laboratory data’s and produce
landslide hazard zonation map. The area is classified into four landslide hazard zones; the
high hazard zone covers about 22%, moderate hazard zone covers 36 %, the low hazard zone
covers 32% and very low hazard zone area covers 20% of the study area. From the inventory
data only 6% of the field slopes falls on the very law hazard class, 18% of the landslide falls
in law hazard zone, 31% of the landslide falls in the moderate hazard zone and 46% falls
High hazard zone. Based on the result analysed, mitigation measure were provision of
Gabion retaining structure, drainage improvement, bioengineering using vegetation and
develop proper land use plan.