• 2025-10-31
• O.O. Ibitoye, O.O. Elemile, T. Omotoso
• Volume 1, Issue 2

Abstract

River flooding disasters occurred due to the sedimentation and riverbed elevation, thus made the water level exceed the flood control standard. There is little information about sediment deposition rates across the different types of weirs in the River Orisa. Thus, this research aims to assess sediment deposition rates under the influence of different types of weirs in the River Orisa, Omu-Aran. Forty-five (45) sediment samples were obtained from five sampling points across the river channel. The MGG/KL-DCB electromagnetic velocity/flow meter was used to measure in situ flow parameters and sediment deposition was determined using open channel flume. Descriptive statistics and ANOVA were used to analyze the data. The in-situ flow velocity for River Orisa ranges from 0.22 to 0.76m/s, the channel depth ranges from 0.18 to 1.85m, and the channel width varies from 3.49 to 56m. The measured deposition rates from the flume were 61.89±30.97, 36.71±14.65, 87.47±67.95, and 120.47±64.99 g/s for broad-crested, sharp-crested, trapezoidal, and V-notch, respectively. There are significant differences in the deposition rate across the different types of weirs in the study location. Therefore, sediment deposition rates are influenced by the weir types in River Orisa, which provides essential insights for hydraulic structure design and sediment management strategies.