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ANALYSIS OF RAINFALL PATTERN AND FLOOD INCIDENCES IN WARRI METROPOLIS, NIGERIA

https://doi.org/10.24057/2071-9388-2017-10-4-83-97

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Abstract

Climate change has led to changes in the known patterns of rainfall and other climatic variables as well as increase in the frequency and magnitude of natural disasters including floods in different parts of the world; and flood is indeed a global environmental issue that had destroyed lives and property amidst other untold hardships. The study examined rainfall characteristics in Warri metropolis for the past 30 years (1986-2015) vis-à-vis the flood situation in the metropolis; as well as the factors responsible and adaptation strategies to flood in the area. Dividing the study area into four zones after Sada (1977), the researchers collected rainfall data from the archives of Nigerian Meteorological Agency; 268 copies of questionnaire and oral interview were used. The result of the correlation analysis performed showed a negative relationship of -0.156 between rainfall and time (years), this implies that rainfall is decreasing over time. The trend line regression equation Y=243.75-0.4572X, confirms that rainfall in Warri Metropolis is decreasing at the rate of -0.45 per year. However, the p-value 0.412 is greater than 0.05, hence, the trend is not statistically significant at 95% level of confidence. It was discovered that rainfall, absence of drainage and poor urban planning practices (as factor 1) contributed 51.09% while overflowing of rivers, blocked/ poor drainage and untarred roads (as factor 2) contributed 44.10% variance to flood occurrence in the metropolis. Recommendations given included continual monitoring and study of rainfall characteristics and other climatic data and dissemination of such information for planning purposes; construction of integrated drainage system and river rechannelisation, legislation against dumping of refuse on roads and drainages; proper urban planning including implementation of the metropolitan urban drainage master plan.

 

About the Authors

R. Olanrewaju
University of llorin
Nigeria
Senior lecturer in the Department of Geography and Environmental Management, University of Ilorin, Kwara State, Nigeria had her Ph.D in Applied Meteorology from the Federal University of Technology, Minna, Niger State, Nigeria


B. Ekiotuasinghan
University of llorin
Nigeria
post-graduate student


G. Akpan
University of llorin
Nigeria
PhD student, Nigeria, Department of Geography and Environmental Management


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For citation:


Olanrewaju R., Ekiotuasinghan B., Akpan G. ANALYSIS OF RAINFALL PATTERN AND FLOOD INCIDENCES IN WARRI METROPOLIS, NIGERIA. GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY. 2017;10(4):83-97. https://doi.org/10.24057/2071-9388-2017-10-4-83-97

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ISSN 2071-9388 (Print)
ISSN 2542-1565 (Online)