Investigation Into the Causes of Blocked Drainage, Canal and Culvert in Ilorin-West Local Government Area (A Case Studies of Agbo-Oba, Oja-Tuntun ad Sawmill)

TABLE OF CONTENTS

Title page                                                                                                                    i

Declaration                                                                                                                 ii

Certification                                                                                                               iii

Dedication                                                                                                                  iv

Acknowledgement                                                                                                      v

Abstract                                                                                                                      vii

Table of Contents                                                                                                       viii

List of Tables                                                                                                              xii

List of Figures                                                                                                            xiii

Appendix (List of plates)                                                                                            xiii

CHAPTER ONE

1.0       Introduction                                                                                                    1

2.0       Statement of the problem                                                                               3

3.0       Aim and objectives                                                                                        4

4.0       Justification                                                                                                    4

5.0       scope of the study                                                                                           5

6.0       Description of the project area                                                                       6

7.0       Research methodology                                                                                   6

CHAPTER TWO

2.0       Literature Review                                                                                           8

2.1       Introduction                                                                                                    8

2.2       Blockage Issues                                                                                              10

2.3       Types of Debris                                                                                              12

 

2.3.1   Overview                                                                                                         12

2.3.2    Floating Debris                                                                                               14

2.3.3    Non-Floating Debris                                                                                       15

2.3.4    Urban Debris                                                                                                  16

2.4       Types of Structures and Drainage Systems                                                    17

2.5       Causes of Blockage                                                                                        18

2.5.1    Overview                                                                                                        18

2.5.2    Modes of blockage                                                                                         19

2.6       Impacts of Blockage                                                                                       20

2.6.1    Overview                                                                                                        20

2.6.2    Hydraulic Impacts                                                                                          21

2.6.3    Economic Impacts                                                                                          22

2.6.4    Social Impacts                                                                                                22

2.6.5    Environmental Impacts                                                                                  23

2.7       Effect of Blockage                                                                                          23

2.7.1    Overview                                                                                                        23

2.7.2    Consequences of blockages on flooding                                                        25

2.8       Control Measure                                                                                             26

 

CHAPTER THREE

3.0       Methodology                                                                                                  27

3.1       Introduction                                                                                                    27

3.2       Research Design                                                                                             27

3.2.1    Population                                                                                                      30

3.3       Data Collection Procedures                                                                            30

3.3.1    Data collection instructions                                                                           30

3.3.2    Primary data                                                                                                   31

3.3.3    Secondary data                                                                                               33

3.4       Data Analysis and Presentation Techniques                                                  33

CHAPTER FOUR

4.0       Data Presentation and Analysis of Result                                                      35

4.1       Introduction                                                                                                    35

4.2       Results from Questionnaire                                                                            35

4.2.1    Results from Questionnaire Type One                                                           36

4.2.2    Results from Questionnaire Type Two                                                           36

4.3       Possible Causes of the Blockage                                                                    42

4.4       Results on Control of Blocked Drainage, Canal and

Study Area                                                                                                      44

 

CHAPTER FIVE

5.0       Conclusions and Recommendation                                                                46

5.1       Conclusion                                                                                                      46

5.2       Recommendation                                                                                           47

            Reference                                                                                                        50       

LIST OF TABLES

Table                                                    Title                                                          Page

4.1       Response rate in rate in Agbo-Oba, Oja-Tuntun and Sawmill                      35

4.2       Number of years spent by the respondent rate in

Agbo-Oba, Oja-Tuntun and Sawmill                                                             39

4.3       Possible causes of the blockage in Agbo-Oba, Oja-Tuntun

and Sawmill                                                                                                    42

4.4       Control of blocked drainage, canal and culvert                                              44

                                                                     

 

LIST OF FIGURES

Figure                                                     Title                                                        Page

4.1       Consideration for hydraulic design                                                               36

4.2       Years spent by the respondent                                                                        40

4.3       Frequency of road usage by road users                                                         41

4.4       The possible cause of the blockage                                                               43

4.5       Control measure in Agbo-Oba, Oja-Tuntun and Sawmill                            45

 

 

APPENDIXS (LIST OF PLATES)

Plate                                           Title                                                        Page

1.0    Drainage blockage along Agbo-Oba road                                             54

2.0    Drainage blockage along Sawmill road                                                56

3.0    Drainage blockage along Oja-Tuntun, kuntu area                                57

ABSTRACT

Drainage is an essential component of road construction. In most designs of the road, the first thing to be put in place is drainage system. The presence of blockage in drainage system tends to reduce the carriage capacity of drainage and thereby affect life span of the road. The research employed a research survey in order to obtain the information that would describe the causes of blocked drainage, canal and culvert in Ilorin-west local government road and its effect on the surrounding environment and the road users. Data collection techniques used includes questionnaires, photographs and observation. The results show that Ilorin-west local government road drainage system was not adequate to satisfactorily drain the runoffs due to the blockage caused by debris, illegal dumping of refuse, Non-channelization e.t.c. As a result, the surrounding environment was greatly affected by washing away some sections of the road and bridges, creation of gullies on land, washing away of the fertility of the land. The drainage facilities could be improved by frequent inspections, maintenance of gabions built for remedying of gullies and construction of water conservation structures e.g. water pans to hold and reduce the speed of water. Some drainage, canal and culvert system on Ilorin-west local government road should be redesign.