Determination of Peak Discharge for Selected Drainage Facilities in Ilorin Metropolis for the Purpose of Storm Water Management
No Thumbnail Available
Date
2020
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Nigerian Research Journal of Engineering and Environmental Sciences
Abstract
The research work was aimed at determining the peak discharge
of flow (maximum storm runoff) into some selected drainage
systems in Ilorin metropolis for the purpose of stormwater
management. The Ilorin municipality has been observed to have
drainage system inadequate in capacities to convey storm runoff
as a result of solid waste disposal into drainage systems which
leads to drain blockage and the excess runoff result in flood. To
obtain the value of excess runoff that leads to flood in the
drainage systems under study, the required drainage area (m2)
for the adequate conveyance of the determined peak flow was
compared with the existing drainage area (m2) the difference in
both areas results in the excess runoff which leads to flood. The
Rational method was used to compute peak discharge for the
study areas while the Manning’s equation was adopted to
compute the expected drainage channel area required for the
adequate conveyance of the peak discharge. The result showed
that the existing drainage area in most of the selected drainage
systems is less than the required area needed to convey the peak
stormwater discharge into the drainage system. The average peak
discharge obtained for all the drainage channels in the study
areas was 266.68 m3/s while the average area expected to convey
the discharge was 8.85 m2. However, the average area of the
existing drainage systems was 0.349 m2 which is relatively to as
compared with 8.85 m2 which represent the excess discharge that
leads to the flooding.
Description
Keywords
Peak discharge, Drainage, Stormwater management, Flood, Rational method
Citation
Oluwaseun, O.V., Bilewu, S.O. and Ayangbola, D.A.(2020). Determination of Peak Discharge for Selected Drainage Facilities in Ilorin Metropolis for the Purpose of Storm Water Management. Nigerian Research Journal of Engineering and Environmental Sciences. 5(1). 116-126