Browsing by Author "A.S. AREMU"

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    EFFECTIVENESS OF GIS-BASED APPROACH FOR FLOOD HAZARD ASSESSMENT OF ONA RIVER, IBADAN, NIGERIA
    (2022-04-21) Habeeb Oladimeji Ganiyu; Adeniyi Ganiyu Adeogun; S.B. BAKARE; A.S. AREMU
    : Flooding is one of the most reoccurrence natural disasters globally and the plan to mitigate the effects of flood cannot be over emphasized. This study assessed the flood stage and flood extent of Ona River, Ibadan, Nigeria using Geographic Information System (GIS) in concert with Hydrologic Engineering Center-Geographic River Analysis System (HEC-GeoRAS). The results of the study revealed that the highest flood stage was predicted at 4.73 m, and 33% of the flood prone areas has a flood stage above 2 m based on the developed inundation map which implies that human and urban infrastructure are not safe. In the case of flood extent, the smallest flood extent was estimated at 694 m2 (Mount Zion Baptist church at Oke-Ayo and its environs) while the largest flood extent was estimated at 115,329 m2. It is recommended that an emergency rescue plan should be formulated to mitigate the effect of flooding in the affected areas such as Sweeco Foods, Tedaz Organic Home, Rehoboth Cathedral, a section of Oluyole Estate Road, Zartech Limited, 7-Up Bottling Company, Obasanjo Farm, and a section of Arapaja estate which are most prone to floods.