HYDROLOGICAL AND HYDRAULICS INVESTIGATION FOR THE DESIGN OF BRIDGE ACROSS AJOWA RIVER AT WUCHALE TOWN AMHARA REGION SOUTH WOLLO ETHIOPIA

Bridges are constructed across the river to create way from one end to another end. The purpose of this study is to carry out hydrological analysis of the rivers, streams and flood paths which intersect with the proposed bridge, to estimate their different return floods magnitudes in order to size the openings of the proposed bridges. During the study the following tasks have been carried out analysis and interpretation of different topographic maps, soils map, satellite imagery and DEM (Digital Elevation Model) data collection of data and analysis for un-gauged rivers and streams, estimation of flood magnitudes by applying different rainfall-runoff models, Sizing of bridges, Provide designs type, size, and location of bridge Assess scour potential at bridge locations. The flood magnitudes at the bridge site are the function of geomorphology, geology, rainfall; soil and land use or land cover within the catchments of the rivers and streams crossing the road.