A Comparative Analysis of Drainage Morphometry on Hydrologic Characteristics of Kereke and Ukoghor Basins on Flood Vulnerability in Makurdi Town, Nigeria
Volume 5, Issue 3, May 2017, Pages: 32-40
Received: Jun. 30, 2017;
Accepted: Jul. 18, 2017;
Published: Aug. 15, 2017
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Oyatayo Kehinde Taofik, Department of Geography, Kwararafa University, Wukari, Nigeria
Bello Innocent, National Space Research and Development Agency, Abuja, Nigeria
Ndabula Christopher, Department of Geography and Regional Planning, Federal University, Dutsin- Ma, Nigeria
Godwill Geofrey Jidauna, Department of Geography and Regional Planning, Federal University, Dutsin- Ma, Nigeria
Ademola Sunday James, Department of Geography, Kwararafa University, Wukari, Nigeria
The synergistic enforcement of the hydrographic behaviors of Kereke and Ukoghor river basins on the river Benue have been identified as the major contributors of the replete episodic flood hazard of Makurdi town. It is on this note that this study aims at analysing and comparing two categories of morphometric parameters; areal and linear/relief which influence runoff/discharge volumes and time lag of Kereke and Ukoghor river basins hydrograpghs respectively. This analysis provides a better understanding of their hydrographic characteristics and vulnerability to the flood hazard. The potential hydrographic variables examined include: runoff, peak flow, time to peak, infiltration, and overland flow. This was achieved using topographical maps of Makurdi sheet 251 NW and 251 SW on scale 1:50,000 published by Federal Survey of Nigeria (1965). These morphometric parameters were evaluated using ArcGIS 10.2 platform. Results indicated that both basins are 5th order basins with dendritic pattern. Kereke and Ukoghor basins have basin area 261.28 km2 94.82 km2, basin length 26 km/10.79 km, basin perimeter 76.28 km/40.15 km, bifurcation ratio 3.51/3.09, length of overland flow 0.56 km/ 0.42 km, form factor 0.39/0.85, circulatory ratio 0.56/0.70, relief ratio 0.45/0.91, drainage density 0.91/1.20, elongation ratio 0.40/ 0.60 and infiltration number 0.53/1.32 respectively. A comparison of the results of linear/relief parameters indicate that Okoghor drainage constitute fast peak flow and concentration time of shorter duration and hence higher flood vulnerability than Kereke drainage basin. On the other hand a comparison of areal aspects of morphometry Kereke river basin constitutes more vulnerability to flooding in Makurdi town than Ukoghor river basin with regards to hydrograph volume regimes. The outcome of the study is fundamental for prioritizing proactive and sustainable urban flood management, appropriate land use planning and zonation especially along their flood liable areas, storm water management and other general urban environmental degradation management.
Oyatayo Kehinde Taofik,
Godwill Geofrey Jidauna,
Ademola Sunday James,
A Comparative Analysis of Drainage Morphometry on Hydrologic Characteristics of Kereke and Ukoghor Basins on Flood Vulnerability in Makurdi Town, Nigeria, Hydrology.
Vol. 5, No. 3,
2017, pp. 32-40.
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