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TITLE PAGE

INFLUENCE OF HYDROLOGIC & SEDIMENT PARAMETERS IN MODELING STREAM FLOW OF OSUN RIVER, OSUN STATE NIGERIA

BY

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EE/H2013/01430
DEPARTMENT OF ----
SCHOOL OF ---
INSTITUTE OF ---

DECEMBER,2018

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APPROVAL PAGE

This is to certify that the research work, "influence of hydrologic & sediment parameters in modeling stream flow of osun river, osun state nigeri" by ---, Reg. No. EE/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.

By
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Supervisor                                                  Head of Department.
Signature……………….                           Signature……………….        

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External Invigilator

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DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.

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ACKNOWLEDGEMENT

The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
My appreciation goes to some of my lecturers among whom are Mr. ---, and Dr. ---. I also recognize the support of some of the staff of --- among whom are: The General Manager, Deputy General manager, the internal Auditor Mr. --- and the ---. Finally, my appreciation goes to my elder sister ---, my lovely friends mercy ---, ---, --- and many others who were quite helpful.

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TABLE OF CONTENT
COVER PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
TABLE OF CONTENT

1. INTRODUCTION
2. BACKGROUND TO THE STUDY
3. PROBLEM STATEMENT
4. AIMS AND OBJECTIVES
5. JUSTIFICATION
6. SCOPE OF THE STUDY
7. DESCRIPTION OF THE STUDY AREA

CHAPTER TWO
2.0     LITERATURE REVIEW
2.1     HYDROLOGY
2.2     BRIEF DESCRIPTION OF SELECTED HYDROLOGY MODELS
2.3     SWAT INPUT DATA AND MANAGEMENT ASSUMPTIONS
2.4     SWAT MODEL DESCRIPTION
2.5     SENSITIVITY ANALYSIS IN WATERSHED HYDROLOGICAL MODELING
2.6     PREVIOUS STUDIES ON SENSITIVITY ANALYSIS OF HYDROLOGIC MODELING

 

CHAPTER THREE
METHODOLOGY
3.0     MODEL SELECTION AND DESCRIPTION
3.1     MODEL INPUT DATA
3.2     WEATHER DATA
3.3     MODEL SETUP AND RUN
3.4     WATERSHED DELINEATION
3.5     SENSITIVITY ANALYSIS OF HYDROLOGIC PARAMETERS

CHAPTER FOUR
4.0     RESULTS AND DISCUSSION

4.1     RESULTS

CHAPTER FIVE
5.0     CONCLUSION AND RECOMMENDATION
5.2     CONCLUSION
5.3     RECOMMENDATIONS

CHAPTER ONE
1.0     INTRODUCTION
1.1     Background to the study
The water is the most important natural resource especially in the arid or semi-arid zones that face high population growth, scarcity of freshwater, irregularity of rain- fall, excessive land use change and increasing vulnerability to risks such of drought, desertification and pollution. Thus, the availability and the sustainable use of this resource become the core of the local and national strategies and politics in these regions.
Hydrology is the main governing backbone of all kinds of water movement and hence of water-related pollutants. Understanding the hydrology of a watershed and modeling different hydrological processes within a watershed are therefore very important for assessing the environmental and economical well-being of the watershed. These models can offer a sound scientific framework for watershed analyses of water movement and provide reliable information on the behavior of the system.
The degradation of hydrological resources has made it essential to encourage management practices based on knowledge of spatial and temporal changes in the quantity and quality of water, in order to ensure the suitability of water supplied for different uses. This can be assisted by using hydrological and water quality models to simulate a wide range of processes in hydrographic basins, such as the production of water and sediments and the dynamics of point and nonpoint sources of pollution.
Hydrological models are powerful tools to represent water-resource availability and behavior in drainage basins under many applications, such as climate change, flood, drought, runoff and nutrient movement (Abbaspour et al., 2015). They can assist in the planning and decision-making processes for environment protection and the guarantee of water availability for future uses (Da Silva et al., 2015; Fatichi et al., 2016).
The ability of hydrological model to produce satisfactory predictions is necessarily correlated to adequate sensitivity analysis and model calibration (Song et al., 2015). Hydrological models, such as SWAT, incorporate several parameters (climatic, hydrological and others) obtained theoretically and through field data collection. Some of these contribute greatly to model outputs (sensitive parameters), while others have minor relevance (non-sensitive parameters) (Van Griensven et al., 2006).
Osun is a river that flow southward through southern Nigeria into Lagos lagoon and Atlantic Gulf of Guinea. 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. Osogbo GPS coordinates are 7˚46’15.74’’N and 4˚33’25.13’’E. Due to the potential of Osun river basin as a major source of water supply, this study will develop a plan that will allow for the sustainable management and treatment of the water in the catchment area.

 

1.2    Problem Statement
Osun River Catchment main source is one of the major sources of water supply, drinking and commercial purposes. It therefore important to know sensitive hydrologic parameters that contribute and hinder the stream flow out and sediment concentration in the catchment area.

1.3   Aims and Objectives
The main aim of this project is to investigate the use of modeling tool for sensitivity analysis of stream flow hydrologic and sediment parameters. Specific objectives achieved are:

1. Simulation ofthe hydrological process of the watershed using temporal and spatial data.
2. Prediction of the stream flow and sediments yield of the watershed.
3. Determine the influence of the hydrologic and sediment parameters on stream flow and sediment yield prediction.

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 onpreliminary 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.

1.7                                                      Project Organisation
The work is organized as follows: chapter one discuses the introductory part of the work,   chapter two presents the literature review of the study,  chapter three describes the methods applied,  chapter four discusses the results of the work, chapter five summarizes the research outcomes and the recommendations.

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