This study arose from the growing water demand within the Asa River Basin due to population upsurge, the absence of existing water demand management strategies, the possibility of scarcity as a result of climate change, and the need for sustainable water resources management. The aim of the study was to assess water availability and water demand of Asa catchment using GIS-based hydrological model. The methodology involved the input of spatial and temporal data into Soil and Water Assessment Tool (SWAT) using Geographic Information System (GIS) as interface. After the model was configured, set up and run, the water balance components and water yield potential were predicted. The modelling results showed that evapotranspiration is the highest water balance component while the lowest is lateral soil flow. The spatial distribution of water yield potentials in the sub-basins of the study area showed that sub-basin 9 has the lowest water yield potential while sub-basin 84 has the highest. The total water yield potential of the study area is 1,296,676.5mm while the total area of the river catchment is 5,618.28km2. The available water resources in the catchment were estimated to be 7.2 billion m3. The projected total population of the domiciled local governments in the catchment for 2015 is 1,203,743 persons and the water demand for this population was estimatedas 1.3 billion m3. Comparing the water demand with the available water resources shows that the available water resources outweigh the water demand, which implies that there was no scarcity. However, there may be future scarcity due to the increasing population and climate change.
Title page
Certification
Dedication
Acknowledgement
Table of contents
List of figures
List of tables
Abstract
1.0 CHAPTER ONE:
INTRODUCTION 1-6
1.1 Background to the Study 1
1.2 Problem Statement 4
1.3 Aim and Objectives of the study 5
1.4 Justification for the study 5
1.5 Scope of Work 6
2.0 CHAPTER TWO:
LITERATURE REVIEW 7-24
2.1 Introduction 7
2.2 Water Resources in Nigeria 8
2.3 Water Management Practices and Policy in Nigeria 10
2.4 Water Allocation Guidelines and Principles 10
2.5 Water Resources Management Models for River Basin Simulation 11
2.5.1 MODSIM 12
2.5.2 MIKE BASIN 13
2.5.3 RIBASIM 14
2.5.4 REALM 15
2.5.5 WEAP21 16
2.6 Description of the SWAT Modeling and SWAT Components 18
2.7 SWAT Strength and Limitation 20
2.7.1 Limitation of SWAT Model 21
2.8 Previous Water Supply And Demand Studies 21
3.0 CHAPTER THREE:
METHODOLOGY 25-36
3.1 Introduction 25
3.2 Model Selection and Description 25
3.3 Model Data Requirements and Collection 27
3.3.1 Digital Elevation Model (DEM) 27
3.3.2 Land Use and Land Cover (LULC) 29
3.3.3 Soil Data 31
3.3.4 Weather Data 32
3.4 SWAT Model Set-Up and Run 33
3.4.1 Model Setup 33
3.4.2 Watershed Delineation 34
3.5 Water Yield Potential and Estimation of Available Water Resources 35
3.6 Water demand estimation 36
3.7 Population Forecasting 36
4.0 CHAPTER FOUR:
RESULT AND DISCUSSION 37-42
4.1 Prediction of Water Balance Component 37
4.2 Prediction of Water Yield Potentials in the Sub-basin of
Asa watershed 40
4.3 Estimation of Available Water Resources 41
4.4 Estimation of Water Demand of the River Basin 41
4.5 Comparison of Water Supply and Demand 42
5.0 CHAPTER FIVE:
CONCLUSIONS AND RECOMMENDATIONS 43-44
5.1 Conclusions 43
5.2 Recommendations 44
REFERENCES 45-51
Gis-Based Assessment Of Water Availability And Water Demand. (n.d.). UniTopics. https://www.unitopics.com/project/material/gis-based-assessment-of-water-availability-and-water-demand/
“Gis-Based Assessment Of Water Availability And Water Demand.” UniTopics, https://www.unitopics.com/project/material/gis-based-assessment-of-water-availability-and-water-demand/. Accessed 20 September 2024.
“Gis-Based Assessment Of Water Availability And Water Demand.” UniTopics, Accessed September 20, 2024. https://www.unitopics.com/project/material/gis-based-assessment-of-water-availability-and-water-demand/
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