Mapping Surface Hydrological Patterns in the Southern Part of Niger State from Digital Elevation Model

Abstract

Determination and mapping of the morphometric parameters of a drainage channel is an essential task for water quality assessment, flood modelling and flood prevention; since these parameters affect catchment flow pattern and eventually drain-basins. The SRTM Digital Elevation Model covering Southern Part of Niger State was used to determine the drainage channels, drainage basins and topographic wetness index (twi) around the study area as a surrogate to flood vulnerability in the area. The results obtained from the study identified Shiroro drainage basin (1104.045 Km2) and Mashegu / Borgu (151.516 Km2) as the largest and smallest basins respectively in the study area. It also pointed out the possibility of flood in certain Local Government Areas (areas with high wetness index such as Paikoro, Chanchanga, Borgu and Mashegu).