Impact of Highway Alignment on Urban Flooding in Minna, Nigeria

Abstract

This paper examines the causes of urban flooding along main road junctions in Minna. The hydraulic capacity of the drainage channels along the carriageway, as well, as the highway alignment were assessed. It was found that the hydraulic capacity of the drainage channels is adequate. The traverse slopes of roads approaching the junctions are lower than the highway standard. This results in retention of water on road surface and weakening the pavement structure. The longitudinal profile of roads shows that the junctions form a valley, without the provision of collectors at the junction. Thus, the flooding experienced at the junction are attributed to poor highway alignment,