Paper Details

The study was carried out in 2022 to examining the percentage capacity loss of Agba dam reservoir in Kwara State. Agba dam reservoir measurements were made using Topcon Hyper V. Precision DGPS for positioning, Garmin GPSmap 78sc for navigation on the reservoir, Syqwest Hydrobox HD single beam echosounder and a transducer for depth measurement, and Hypack 2018 hydrographic software for observing and processing of raw data. During the bathymetric measurements, depth and location measurements was conducted simultaneously to detect the location of the point in both horizontal and vertical planes. It was ascertained that the reservoir storage capacity as computed using ArcGIS 10.8 software was estimated with respect to the design capacity for the three methods of interpolation where Insertion of Mesh Point (IMP) method was 2.412 MCM, Triangular Irregular Network (TIN) method was 2.326 MCM, Inverse Distance Weighted (IDW) method was 2.274 MCM against the Design Capacity of 3MCM and the IMP method gave the least error by statistical analysis of the three interpolation methods as 2.286 (MAE), 7.387 (MSE) and 2.718(RMSE) with the highest volume making it the most acceptable method in this perspective. Keywords: Capacity loss, Navigation, bathymetric, storage capacity, Design capacity, Acceptable method