Selecting Suitable Drainage Pattern to Minimize Flooding in Sangere Village Using GIS and Remote Sensing
Water shed analysis is a geographic information system (GIS) based technique designed to model the way surface water flows on the earth surface. This was the method adopted to select suitable drainage pattern to minimized flood in some parts of sangere. The process of watershed computes the local direction of flow and defines the stream network and the areas drained by particular system. The data used for these calculation (that is, aspect, slope and height differences) are derived from the digital elevation model (DEM) of the area, which was first generated from spot heights obtained from the ground survey using Total Station. ILWIS 3.3 software package was employed in the production of slope and aspect map from which watershed map was produced. The result shows the production of watershed for build up area and suitable drainage network. The research recommended watershed analysis for the control of flood in sangere and the construction of side drainages along the streets.
Keywords: Watershed, Aspect, Slope, Drainage, Flood.