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INVESTIGATION OF THE SPATIAL AND TEMPORAL VARIATION OF SEDIMENT YIELD AND SURFACE RUNOFF IN OFFA WATERSHED

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TITLE PAGE

INVESTIGATION OF THE SPATIAL AND TEMPORAL VARIATION OF SEDIMENT YIELD AND SURFACE RUNOFF IN OFFA WATERSHED

BY

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

DECEMBER,2018



APPROVAL PAGE

This is to certify that the research work, "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " by ---, Reg. No. EE/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.

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

……………………………….
---
External Invigilator



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.



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.


PROJECT DESCRIPTION: This work "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " research material is a complete and well researched project material strictly for academic purposes, which has been approved by different Lecturers from different higher institutions. We made Preliminary pages, Abstract and Chapter one of "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " visible for everyone, then the complete material on "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " is to be ordered for. Happy viewing!!!


ABSTRACT

In this research, an hydrological modelling tool, soil and water assessment tool (SWAT) used to investigate the spatial and temporal variation of sediment yield in a watershed. The model was run for 31years using spatial data such as Digital Elevation Model, soil map, land use and precipitation, wind and solar radiation. The results showed that the maximum value ofsurface Runoff was estimated as 19100.034mm in the year 2005 while the minimum surface Runoff was 1000.671mm in the year 20017. The maximum value of sediment yield was estimated as 2340.532mm in the 2005 and the minimum value was estimated as 34.769mm in the year 2003.

TABLE OF CONTENTS
Title page                                                                                           
Certification                                                                                        ii
Dedication                                                                                           iii
Acknowledgement                                                                                iv
Abstract                                                                                              v
Table of content                                                                                  vi
List of Figures                                                                                      ix

CHAPTER ONE: INTRODUCTION
1.1     Introduction                                                                              1
1.2     Problem Statement                                                                     2
1.3     Aims & Objectives                                                                      2
1.4     Justification                                                                               3
1.5     Scope of Study                                                                           3
1.6     Description of Study Area                                                            3

CHAPTER TWO: LITERATURE REVIEW
2.0     Literature Review                                                                       5
2.1     Sediment Source Analytical Techniques                                         5
2.2     Sediment Yield Measurements                                                      6
2.3     Field Measurements of Sediment Yield                                           7
2.4     Sediment Yield Modeling                                                             7
2.5     Brief Description of Selected Hydrology Models                                       8
2.5.1  RIBASIM                                                                                    8
2.5.2  WEAP                                                                                        9
2.5.3  Realm Resource Allocation Model                                                 9
2.5.4  HSPF Model                                                                               10
2.5.5  AGNPS Model                                                                                       10
2.5.6 SWAT Models                                                                             11
2.6     SWAT Model Description                                                             11
2.7     Water Shed Hydrological Modeling.                                              11

CHAPTER THREE: METHODOLOGY
3.0     Methodology                                                                              13
3.1     Model Selection and Description                                                   13
3.2     Model Input Data                                                                       14
3.3     Digital Elevation Model (DEM)                                                      14
3.4     Soil Map                                                                                    15
3.5     Weather Data                                                                             16     
3.6     SWAT Model Set-up and Run                                                       16
3.7     Water Shed Delineation                                                               16
3.8     Land use map of the watershed                                                    17

CHAPTER FOUR: RESULTS AND DISCUSSION
4.0 RESULTS                                                                                       19
4.1 Temporal Variation of total means for surface runoff                          19
4.2 Temporal variation  of total means for sediment yield                         20
4.3     Temporal variation of annual means for sediment yield                   21
4.4     Temporal variation of annual means for surface runoff                     21

CHAPTER FIVE: CONCLUSION AND RECOMMENDATION
5.0 Conclusion                                                                                     23
5.1 Recommendation                                                                            23
References                                                             
LIST OF FIGURES


Figure

Description

Page No.

1.1
1.2
1.3
3.1
3.2
3.3
3.4
3.5
4.1
4.2
4.3
4.4

 

Map of Nigeria
Offa watershed
Kwara State Map
Technical workflow of the study
Digital elevation model of the study area
The Soil map of the study area

Watershed delineation

Land use map

Temporal variation of surface Runoff

Temporal Variation of annual means for sediment yield
Temporal Variation of annual means for sediment yield
Temporal variation of annual Means

4
4
4
13
15
15

17

17

18

19

20

21


CHAPTER ONE

    • INTRODUCTION

Water is an integral part of life, as human beings derived from the environment several services that are necessary for the survival, Water is one of the basic needs that human beings cannot live without; indeed water is life! Therefore, water-related (hydrological) ecosystem services provided by the environment (e.g provision, regulation and purification of freshwater) are quite valuable and important for human well-being. This underscores the importance of sound watershed management for continued provision of hydrological ecosystem services. From a hydrological point of view, a watershed includes all land contributing water (surface and ground water) to a reference point.     
  It is therefore obvious that land comprising of any watershed would generally be under other uses such as forests, agriculture and urban centers, which might commonly be considered ‘primary’ land uses. This means that watersheds provide other important ecosystem services, beside provision of hydrological ecosystem services. In some cases, enhanced provision of some ecosystem services may also lead to reduced capacity of watersheds to provide other services e.g. intensive cultivation to maximize food production may also lead to increase in soil erosion and consequently degradation of water quality.
Sediment yield is the amount at a point of interest in a particular period of time which occur due to heavy rainfall, are normally as tones per year or kilogram per year.
A large part of failure to achieve reasonable estimates of average annual sediment lies in particles of extrapolating relationship derived from field data with no consideration of appropriateness for future conditions.
Sediment yield is affected by many factors such as climate, soil, relief, vegetation and human influence. Runoff refers to as the part of water cycle that flow over land as surface water.
Runoff has been used as a variable representing climatic conditions and includes not only the water that travel over the land surface and through channels to reach a stream but also interflow, the water that infiltrates the soil surface and travels by means of gravity toward a stream channel.
In this study offa water shed is simulated to predict the surface runoff and sediment yield. The spatial and temporal variation obtained can be used as a decision support tool in the management of the water shed.

1.2   PROBLEM STATEMENT
Recent flooding issues in Nigeria as a result of excessive rainfall has resulted into runoff and sediment yield in the area. Therefore in order to manage the water shed sustainability, it is necessary to predict the variation of sediment yield and runoff in the area which can serve as a data base in managing the watershed.  

1.3     AIM AND OBJECTIVES
The aim of the research was to investigate the spatial and temporal variation of sediment yield and runoff in Offa watershed.Specific objectives achieved are:

  • Predict the surface runoff and sediment into watershed
  • Develop temporal variation map of sediment yield and runoff
  • Develop spatial variation map of sediment yield and runoff

1.4     JUSTIFICATION
The Spatial and temporal variation of sediment yield and runoff in the catchment area can serve as a decision support tools to water managers in the area to plan a sustainable management of the water shed.

1.5     SCOPE OF STUDY
The scope of the work was limited to the study of temporal variation of sediment using temporal data of 31years from 1986 to 2016. the analysis was based on preliminary modeling results obtained from digital elevation model (DEM) land use and soil map to predict the optimum variation of sediment yield and runoff generation in Offa water shed.

1.6     DESCRIPTION OF STUDY AREA
Offa water shed is located in offa local government area of kwara state Nigeria. It is one of the main water supply in its locality, it is about 43km from Ilorin the capital of kwara state it fall within the latitude 8.1393o N and 4.71740 E. The map  is shown in figure 1.1-1.3

Figure 1.2:Kwara State Map  

Figure 1.3: Offa Water Shed

Figure 1.1: Map of Nigeria
 

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.


CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " is also available. Order full work to download. Chapter two of "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " consists of the literature review. In this chapter all the related work on "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " was reviewed.

CHAPTER THREE: The complete chapter three of "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " is available. Order full work to download. Chapter three of "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " consists of the methodology. In this chapter all the method used in carrying out this work was discussed.

CHAPTER FOUR: The complete chapter four of "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " is available. Order full work to download. Chapter four of "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " consists of all the test conducted during the work and the result gotten after the whole work

CHAPTER FIVE: The complete chapter five of design and construction of a "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " is available. Order full work to download. Chapter five of "investigation of the spatial and temporal variation of sediment yield and surface runoff in offa watershed " consist of conclusion, recommendation and references.

 

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