Influence Of Hydrologic & Sediment Parameters In Modeling Stream Flow Of Osun River, Osun State Nigeria

1.4   Justification
Most rivers are ungauged especially in developing countries and therefore prediction of stream flow for sustainable water management is regarded as an alternative. Prediction of stream flow and sediment yield requires many hydrologic and sediment parameters. Also, calibrating and validating such models are quite cumbersome due to many parameters to deal with.
Therefore, it is very important to carry out sensitivity analysis of the modeling parameters to assist modelers in concentrating effort on most sensitive parameters that affect prediction of stream flow and sediment yield.
1.5   Scope of the Study
This research work is to carry out the sensitivity analysis of hydrologic parameters in modelling stream flow of osun river catchment. The analysis will be based on preliminary modelling results obtained from the modelling of the watershed. Parameters of interest are stream flow out and sediments yield with 31years meteorological data for the modeling exercises.
Model calibration and validation were not part of the scope covered in this research work.
1.6   Description of the Study Area
Osun is a river that flow southward through central Yoruba land in southern Nigeria into Lagos lagoon and Atlantic Gulf of Guinea. The Osun River is located within Osogbo Local Government Area of Osun State, Nigeria. It falls within Longitude 7˚46’15.74’’N and latitude 4˚33’25.13’’E. It is one of the several rivers ascribed in local mythology to have been women who turned into flowing waters after some traumatic event frightened or angered them. The map of the study area is as shown in Figure 1.1