HYDRAULIC ASSESSMENT FOR SIGHTING A CONCRETE WEIR ON OGBESE RIVER FOR IRRIGATION

• Obiora-Okeke, O. A

  Federal University of Technology, Akure, Nigeria

• Owolabi, S. H

  Federal University of Technology, Akure, Nigeria

• Adewumi, J. R

  Federal University of Technology, Akure, Nigeria

Weirs are constructed along river channels to create sufficient head for water pumps or diversion. Weir location requires gorge section with steep channel side slopes to prevent overtopping of the section during peak river flows. Hydraulic investigations were conducted to determine the capacity of an existing failed weir section and new weir location to accommodate a 2-year, 25-year, and 50-year return period flood. Aeronautical Reconnaissance Coverage Geographic Information System (ARC-GIS) and Hydrological Engineer Center - Hydrological Modeling System (HEC-HMS) was used for rainfall-runoff modeling to generate peaks river flows. Hydrological Engineer Center – River Analysis System (HEC-RAS) was used to simulate river flow cross-sections.  Watershed area was delineated in Digital Elevation Model (DEM) and ARC-GIS.  The predominant land use/cover is forested area which is 64.8% of the watershed area. Built-up area contributed 13.1% of the watershed area.  Sandy clay loam is the predominant soil type. 2-year return period river flow was accommodated in the banks of the new weir location but breached the right bank at the failed weir section.  25-year return period flood was accommodated within its banks of the new weir location but breached both banks at the failed section.  50-year return period flood minimally breached both banks of the new weir location.  The new weir location was therefore recommended with rip-rap construction 10 m from both the left and right bank new weir location

1. Obiora-Okeke, O. A, Federal University of Technology, Akure, Nigeria

   Department of Civil and Environmental, Engineering

2. Owolabi, S. H , Federal University of Technology, Akure, Nigeria

    

    

   Department of Civil and Environmental, Engineering

3. Adewumi, J. R, Federal University of Technology, Akure, Nigeria

    

   Department of Civil and Environmental, Engineering

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