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. 


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


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


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


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


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


5.0 Conclusions and Recommendation 46

5.1 Conclusion 46

5.2 Recommendation 47



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


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


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



Nigeria is the most populous country in Africa. At the census of November 1991, Nigeria had 88, 514,501 with an inhabitants and a population density of 95.8 per 59 km.

The average annual growth rate between 1963 and 1991 is 1.7% (Baiye E; 1991). According to 2006 census figure, Nigeria had a population of 140 million people. The major hazard experienced in Nigeria includes flooding, erosion, deforestation, land degradation and climatic drought.

Flooding in Kwara state has been due to natural or artificial occurrences of blocked drainage, canal and culvert due to solid waste, wash away of the top soil, debris like trees, and leaves present in the water channel. Flooding has been experienced in different part of the state especially in Ilorin west local government area of the state, which has claimed life, damaged properties of the people that reside in the geographical area and as well as damaged the road pavement to greater extent.

Drainage is the process of removal of surface or subsurface face by water from a given area by natural or artificial means. (Adeyemi, 2005). The term is commonly applied to the removal of excess water by canals, drains, ditches, culverts and other structure designed to collect and transport water earlier by gravity or by pumping. A drainage project may involve large scale reclamation and protection of marshes, underwater lands or lands subject to frequent flooding (Microsoft- Encarta 2009).

Canal is an artificial waterway for navigation and irrigation, etc. it is a long narrow arm of the water penetrating an inland. Canals are man-made channel for water conveyance (Supply), or to services water transport vehicles. A true canal is a channel that cuts across drainage, making a navigable channel connecting two different drainage basins. Most commercially important canal of the first half of the 19th century were a little of each using rivers in long stretches and divide crossing canal in others. This is true for many canals still in use (Donald Lang mead, 2013).

A culvert is a conduit used as an artificial channel under a road way or embankment to maintain flow from natural channel or drainage ditch (Oshunkey, F.E (1992). A properly design culvert will carry the flow without causing damaging, backwater, excessive construction or excessive outlet velocities. Culverts usually have span less than 6m per cell (\www., (Albert transportation (2004)).

Blocked drainage, canal and culvert are caused as a result of high population of people living in a geographical area without the proper management of waste disposal, falling trees. Virtually every Nigerian is vulnerable to flooding either by natural or artificial.


Ilorin-west local government area has been experiencing severe blocked drainage, canals and culvert over the years, which has makes life very hard for the residential in the area and result to loss of life and property.

It has rendered some people homeless and jobless; it is dangerous for the possibilities of infliction by diseases such as cholera, typhoid, fever, malaria etc. as a result of enhancing stagnant water. It also forces many occupants to relocate due to air pollution and others factor causes by blocked drainages, canal and culverts


The aim of this project work is to investigate into the causes of blocked drainage, canal and culvert in Ilorin-west local government area of Kwara state in Nigeria.


1. To look into the factor that causes blocked drainage canal and culvert.

2. To find out the hazards which blocked drainage canal and culvert causes to human environment. 

3. To find out the various control measures needed to bring blocked drainage under control.

4. To suggest a proper drainage, canal and culvert management.


The construction of drainage, canal and culvert in the country is given much of structural or engineering consideration with little or no environmental impact assessment of the operations after the design and construction. The environmental problem results from operation which are usually devastating.

Hence, this study significantly addresses the following issues.

⦁ Identify the environmental hazards associated with the drainage, canal and culvert.

⦁ Evaluate the magnitude or significance of the hazard and effect.

⦁ Identify changes in downstream hydrology.

⦁ Identify changes in downstream morphology caused by altering the flow pattern.

⦁ Examine control techniques to eliminates or lesson the severity of the effect and to manage the hazards.

⦁ Develops plan and procedures to manage the environmental changes due to the operation of the drainage, canal and culvert.


This project focus on the investigation into the causes of blocked drainage, canal and culvert; its effect and the possible control measure within Ilorin-west local government area in Ilorin.

The investigation covered the basic hazard which may be caused by blocked drainage, canal and culvert to the human environment and to look into the causes in the place it happens within Ilorin-west local government. Investigating the various control measure needed to bring blocked drainage, canal and culvert under control.  


Ilorin west is one of the sixteen (16) local government in Kwara state and also one of the five (5) local government that made up Kwara central popularly known as (Emirate) with its headquarters located/ situated in Wara Osin in Ilorin metropolis, this capital of Kwara state. A case study of Agbo-oba, oja-tuntun and Sawmill was assigned.  


The methodology employed are:- preliminary data source, which may include:-


This is the feasibility study of the area to determine the Feeder Rivers, geology of the area and level of deterioration of building causes by flood as a result of blocked drainage, canal and culvert and also investigation into the cause of the blockage and also know the control measure to be used or adopted. 


Oral interview was conducted to hear the view of the residents on the causes of blocked drainage, canal and culvert and to determine the control measure of the blocked drainage, canal and culvert in other to suggest the best control measures.


Questionnaires was distributed for analysis   



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