Evaluation Of Factors Responsible For Landslide In Haro Village And Its Surrounding North Shoa Centeral Ethiopia

As a consequence of frequent occurrences of landslides in Haro village and itsrnsurrounding, an investigation was undertaken to determine the factors responsiblernfor the landslide in order to produce a landslide hazard Zonation map using thern“Landslide Hazard Evaluation Factors (LHEF)” rating scheme as the mainrnmethodological tool. The geology of the area is mainly dominated by weathered andrnweak contact structural discontinuities of basalts, Limestone, Sandstone, gypsumrnand loose unconsolidated colluvial soils which are responsible for the instability ofrnthe slopes in the area.rnSix major inherent causative factors; Lithology, Structure, Slope morphometry,rnRelative relief, Land use land cover and Ground water conditions have beenrnrecognized for the purpose of generating a landslide hazard classification. For thisrnpurpose Landslide Hazard Evaluation Factor (LHEF) approach was employed. Byrnapplying the LHEF approach, these factors were analyzed facet wise based on thernchosen categories. Each category is then given a corresponding rating based on thernamount the factors contribute to the landslide activity. The ratings for each facet arernsummed up to give the Total Estimated Landslide Hazard Rating (TELHR). Finally,rnthe landslide hazard map, from 54 facets, has been generated and five hazardrnzones have been identified as; very low (18%), low (15%), moderate (15%), highrn(41%) and very high (11%).rnFrom the very high and high hazard zones, the potential unstable slopes werernidentified and the Engineering properties of rocks and soils have been determinedrnfor classification purpose. As the slope instability posses danger to the villages arerndue to the geological structures, weak contact of rock beddings, poor drainages,rnless vegetation cover and loose unconsolidated colluvial soils, slope stabilityrnanalyses and some possible methods of slope stabilization or remedial measuresrnare necessary and have been described and suggested, and which should include;rnavoidance, surface and subsurface drainages improvements, constructing simplernretaining structures and planting suitable trees.

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