MIDDLE AND LOWER OGUNPA RIVER CHANNELIZATION PROJECT IN IBADAN, OYO STATE
The Ogunpa River, which transverses Ibadan City, was notorious for several recorded cases of floodings that devastated the residential areas, commercial and public infrastructure along its river basin in Ibadan township:
- In 1960 and 1963, scores of households became inhabitable due to high water level.
- In 1978, lives and properties were lost to flooding caused by torrential rains.
- The August 31, 1980 flooding, caused by heavy downpour exceeding four times the one of 1978, took the highest toll on lives and properties on record.
The Channelization Project, completed in 2005-2008, was purposed to mitigate the perennial floodings along Lower and Middle Ogunpa River once and for all.
It included:
- desilting of existing river course
- construction of reinforced concrete U-channel
- construction of reinforced concrete bed and grouted stone masonry slopes divided into cells by network of reinforced beams
- construction of culverts and spillway outlets
- construction of 5 Nos. vehicular and 3 Nos. pedestrian bridges, access roads and ramps
- construction of trash racks and cross cofferdams
- installation of control gate at reservoir outlet
Project in numbers:
Earthworks: 1,044,000 M3
Asphalt Concrete: 3,600 T Concrete: 89,700M3
Reinforcement and structural steel: 3,100 T
Crushed Aggregates: 271,000 T
Culverts: 795 LM
Bridges 140 M
- Client:
- National Committee on Ecological Problems
- Contract Value:
- USD 58 Million
