PROMOTING ACCESS TO AFRICAN RESEARCH

Nigerian Journal of Technology

Log in or Register to get access to full text downloads.

Remember me or Register



Flood inundation and hazard mapping of River Zungur Watershed using GIS and HEC-RAS models

A.B. Olasunkanmi, S Dan’azumi

Abstract


Zungur watershed located in the southern region of Bauchi State has no record of existing flood plain mapping. This research integrated HEC-RAS with GIS to estimate the flood zone of Zungur Watershed. HEC-GeoRAS, an ArcView GIS extension HEC-RAS, was used to delineate the areas prone to flooding at different discharges of 2 to 100 years return periods. Area inundated by 2, 5, 10, 25, 50 and 100-year floods were 186.71, 189.15, 193.59, 197.63, 200.09 and 205.32 km2 respectively with maximum inundation depths ranging from 5.37 m to 7.37 m for 2 to 100 years. Flood inundation mapping showed that Zungur, Dass, Bagel, Sabongida, Mun, Birim, Talagutta and Gwani Settlements are likely to be affected by 100-year flood and agricultural land is the most affected landuse. The result of this study showed that hydraulic simulation and GIS could be effective for floodplain mapping and management.

Keywords: River Zungur, Flood Inundation, Frequency analysis, HEC-RAS, GIS




http://dx.doi.org/10.4314/njt.v37i4.41
AJOL African Journals Online