Environment and development
in coastal regions and in small islands
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STUDY OF MAIN DRAINAGE CHANNELS OF VICTORIA AND IKOYI ISLANDS IN LAGOS NIGERIA AND THEIR RESPONSE TO TIDAL AND SEA LEVEL CHANGES

By

L.F. Awosika (Project Leader), C.O. Dublin-Green, R. Folorunsho, E. A. Adekoya, M. A. Adekanmbi, L. Jim-Saiki
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Nigerian Institute for Oceanography and Marine Research



Table of Contents


ACKNOWLEDGEMENT

EXECUTIVE SUMMARY

CHAPTER ONE: THE PROJECT
1.1            Introduction
1.2            Setting
1.3            Objectives
1.4            Scope of Survey
1.5            Causes of Flooding
          1.5.1   Natural Causes
          1.5.2      Anthropogenic Causes

1.6     Climate Change and Sea Level Rise

CHAPTER TWO: SURVEY METHODOLOGY
2.1     Meteorological Data
          2.1.1.      Air Temperature
          2.1.2.      Wind Speed and Direction
          2.1.3.      Rainfall
          2.1.4.      Tidal Data

2.2          Drainage Channel Leveling
2.3          Questionnaires
2.4          Bathymetric Survey

CHAPTER THREE: RESULTS
3.1     Meteorology
          3.1.1.      Temperature
          3.1.2        Wind
          3.1.3        Rainfall
          3.1.4        Tides
          3.1.5        Storm Surge

3.2.    Drainage Channels
          3.2.1        Ikoyi Island Channel  3
          3.2.2        Ikoyi Island Channel  7
          3.2.3        Ikoyi Island Channel 11
          3.2.4        Victoria Island Channel 1
          3.2.5        Victoria Island Channel 2
          3.2.6        Victoria Island Channel 4
          3.2.7        Victoria Island Channel 8
          3.2.8        Victoria Island Channel 14

3.3.    Bathymetric Survey of Relevant Parts of The Lagoon
3.4.        Results of Questionnaire
3.5.        The Potential Effects of Global Warming and Sea Level Rise on Flooding

CHAPTER FOUR: MEDIA AND PUBLIC FORUM
4.1          Introduction
4.2          Some Pertinent Questions/Comments from the Audience
4.3          Post mortem of the  Media and  Public  Forum
4.4          Action  Programme Suggested  By Dr. Harry Baral (CSI Consultant)
          4.4.1        Three layers of action
          4.4.2        Implementing actions

CHAPTER FIVE: CONCLUSION AND RECOMMENDATION
5.1    
Adapting Coastal Drainage Systems to Sea Level Rise
5.2          Recommendations
          5.2.1.      Drainage Channel Routes
          5.2.2.      Earthen Channels
          5.2.3.      Flooding as a Result of  Storm Surges
          5.2.4.      Blocked Drains

5.3          Conclusion

REFERENCES

APPENDIX I - Questionnaire

APPENDIX II - Rainfall Data

APPENDIX III - Echograms of Bathymetric Survey

APPENDIX IV - Graphical Results of Questionnaire

APPENDIX V - Press Releases on the Media and Public Forum


For more information, please contact:

L. F. Awosika,
Project leader,
Nigerian Institute for Oceanography and Marine Research,
Victoria Island, P.M.B. 12729, Lagos, Nigeria


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