Assessment Of The Impact Of Road Construction On Physical Land Degradation In Central Highlands Of Ethiopia The Case Of Two Selected Projects

Ethiopia provides a well-known example of a severely degraded African environment withrnconsequent implications for food insecurity and famine. Physical land degradation after roadrnbuilding has been observed in Central Ethiopian highlands through gully erosion. In thisrnresearch work by using a number of methods such as Field observation, gully measurement,rnGIS technique ,the 1997topomap and socio-economic questionnaires, the impacts of the roadrnon land degradation has been studied. It investigates how road building in the EthiopianrnHighlands affects the gully erosion risk by quantifying the catchement area before and afterrnroad construction, the number of gullies created, and its characteristics in two selectedrncases: Addis Ababa-Fiche and Addis Ababa-Ambo. Accordingly; since the building of thernroad, 17 new gullies were created immediately downslope of the studied road segmensts andrn8 other gullies at a radical change in its dimensions. The area drained to the gully headrnbefore road construction are smaller than after the road has been constructed. The averagerncatchement area is now 58.28 hectares and 74.52 on the road segments of Fiche and Ambornrespectively, which is significantly different (p

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