Authors : Adeyokunnu, A. T.; Adejumo, K. S.

Volume/Issue : Volume 11 - 2026, Issue 10 - October

Google Scholar : https://tinyurl.com/y7utsxhj

DOI : https://doi.org/10.38124/ijisrt/26Oct1456

Note : A published paper may take 4-5 working days from the publication date to appear in PlumX Metrics, Semantic Scholar, and ResearchGate.

Abstract : Floods are the most common natural phenomenon due to relatively higher flows and that temporarily submerges land and habitation endangering both life and properties. River Ogun flood annually with paucity of information on the extent and mitigation approach. In this study, floodplains mapping within River Ogun Lower Basin was done to reduce flooding menance in the area. Catchment delineation of River Ogun requires the imagery of the whole river Ogun catchment and elevation data obtained from Goggle earth. This data were remote sensed and taken to GIS environment. The river was characterized into three basins based using GIS hydrological tool (Upper Basin, Mid-Basin and Lower Basin). The hydrographical delineation entails the flow region of River Ogun, its tributaries and tributaries flow network and pattern. The input for the hydrographical delineation are the Google earth remote sensed elevation data. The Lower basin of River Ogun was identified as the region with highest flow influx. Different maps were derived from the delineation of the lower basin catchment area. The summary of the data were used to generate the following maps which includes contour map, topography map, drainage pattern map, elevation collection points map, land-use map, digital elevation measurement (DEM) and floodplain map. The maps generated can be used as a drainage master plan, Land use monitoring, Channel Improvement and Floodplain zoning to reduce the development-induced impact along the area.

Keywords : Floodplain, Mapping, GIS, River Ogun Basin and Model.

References :

1. Adeyokunnu, A.T. and Oyelami,A.K. (2024). Development of Model to Alleviate Flooding in Oko ErinArea, Kwara State, Nigeria. International Journal of Advances in Engineering and Management. 6 (9): 67-74.
2. Biswat, Asit K. "Edmond Halley, F.S.R., Hydrologist Extraordinary". JSTOR. Royal Society Publishing.
3. Caliper Corporation (2019). Geographic Information System Software Features.
4. Djokic and Maidment (2012). Introduction to HEC-RAS and Floodplain Mapping http://www.ce.utexas.edu/prof/maidment/CE374KSpr12/Ex 4/Ex4.htm
5. HEC-RAS River Analysis System (2010). “Hydraulic Reference Manual”, Version 5.0.1, U.S. Army Corps of Engineers, Hydrologic Engineering Center, Davis, California.
6. Mays, L.W. (2005). “Water Resources Engineering”, John Wiley and Sons Inc., New Delhi, India.
7. Mohammed L, (2015). Hydrodynamic Simulation of River Yamuna for various return level floods, thesis, Department of Civil Engineering, Faculty of Engineering and Technology, Jamia Millia Islamia, (Central University), New Delhi.
8. Ndolo Goy and Julien, (2014). CIVE 401 HEC-RAS Presentation. http://www.engr.colostate.edu/~pierre/ce_old/classes/CIVE %20401/index.html US Army Corps of Engineers. HEC-RAS
9. Nwachukwu, C.J. (2018). Preliminary Flood Risk Vulnerability Assessment of Parts of Eastern          Niger Delta using Landsat and GIS Data. M.Sc, Thesis, Federal University of           Technology, Owerri.
10. Parhi, P.K. (2013). HEC-RAS Model for Manning’s Roughness: A Case Study Open Journal of Modern Hydrology.
11. Tate, E.C. and Maidment, D. (1999). Floodplain mapping using HEC-RAS, Center for Research in Water Resources, Bureau of Engineering Research, University of Texas, Austin, TX.
12. Timbadiya, P.V., Patel, P.L., and Porey. P.D. (2012). Calibration of HEC-RAS model on prediction of flood for lower Tapi river,India, J. of Wat. Reso. And Prot.,3:805-811.
13. Vijay, R., Sargoankar, A. and Gupta, A. (2007). Hydrodynamic Simulation of river Yamuna for riverbed assessment: A case study of Delhi region, Environment Monitoring Access.
14. Zadeh, A.H., Ahmadi, M.Z., Sharifi, M.B. and Masoudian, M. (2005). Flood zoning using the HEC-RAS hydraulic model in a GIS environment, Journal of Environment Hydrology, vol. 13, paper 2.