Flood Inundation Analysis of Lower Usuma River in Gwagwalada Town Abuja, Nigeria.
- Author David O. Balogun
- Co-Author Aliyu Ibrahim, Samuel Boyi, Augustine A. Okewu, Ibrahim T. Philip
- DOI
- Country : Nigeria
- Subject : National Biotechnology
Keywords : Flood Return Period, Flood Inundation, Hydraulic Modelling, Gumbel Distribution.
Abstract
Flood inundation analysis of Lower Usuma River in Gwagwalada town Abuja was studied. HEC-RAS hydrologic modelling system and GIS were used to determine flood inundation for 5, 10, 50 and 100 year return periods. Flood frequency analysis showed that the water surface elevation gradually rises with increase in return period from 5year to 100year return period and a gradual increase in flooded area from about 24.76% in 5year return period to 26.75% in 100year return period. Also an increase in valleys and channel width of the river, the width of the flooded area increases and water expanded in wider area. The study showed that Gumbel’s distribution is suitable for predicting expected flooding. Considering the likely impacts of severe flooding in Gwagwalada town along the Lower Usuma River, there is an urgent need for the State, Local and Administrative Authorities to ensure that appropriate town planning regulations are adhered.
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