Boundary Influence and Flow Characteristics of Orisa and Ala Rivers in Kwara and Ondo States, Nigeria

In this study, the effects of boundary influence on flow characteristics Rivers Ala and Orisa were investigated. Soil samples collected from three points each both rivers namely Glory Parish Area (GPA), Olusola Oke (OOA) Fiwasaye; Aran-Orin (AOA), Rore Omu-Aran Respectively. A MGG/KL-DCB Portable Electromagnetic Velocity Meter was used to measure in-situ readings discharge velocity at various points. The sediments sampling placed in Flume Hydraulic Laboratory Civil Engineering Department, Landmark University. then set with measured parameter (Discharge) for point apply determine slopes 0.008 0.056 respectively. velocities obtained different inserted into Manning’s Coefficient equation obtain characteristics. relationship between determined using Spearman’s rank correlation coefficient. All analyses done P-value less than 0.05 level significance. varied 0.0237± 0.0004 0.0587± m/s; 0.0542± 0.0701± 0.0003m/s 0.0789± 0.0005 0.0172± 0.1323m/s GPA, OOA Fiwasaye River 0.0751± 0.0007 0.1008± 0.0006m/s; 0.0628± 0.0839± 0.0004m/s 0.0421± 0.1076± AOA, River. results soil showed that inversely proportional Mannings’ coefficient all if geometry river channel is kept constant. This indicates areas high are prone flooding. Further studies should be carried out more confirm rivers.