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FLOODING
IN NIGERIA: CAUSES, EFFECTS AND SOLUTION
Chapter
one
Introduction
1.1
Background to the study
Floods
are major disasters affecting many countries of the world annually especially
in most flood plain areas. Floods do not only damage properties and endanger
the lives of human and animals but also produce other secondary effects like
outbreak of diseases such as cholera and malaria as well. Flooding is commonly
caused by heavy downpours of rains on flat ground, reservoir failure, volcano,
melting of snow and or glaciers e.t.c. Flood risk is not just based on history,
but on a number of factors: rainfall, riverflow and tidal-surge data,
topography, flood control measures, and changes due to construction of building
and development on flood plain areas.
Flooding
is caused by several factors and is invariably preceded by heavy rainfall. The
other causes of flooding are moderate to severe winds over water, unusual
hightides, tsunamis due to undersea earthquakes, breaks or failures of dams,
levees, retention ponds or lakes, and other infrastructure that retains water.
Flooding can be aggravated by impervious surfaces or by other natural and
man-made hazards which destroy soil, vegetation that can absorb rainfall.
Although flooding is a natural occurrence, man-made changes to the land can
also be a factor. Development does not cause flooding but can make it worse. In
cities and suburbs, pavement and rooftops prevent some rainfall from being
absorbed by the soil. Thus can increase the amount of runoff flowing into low
lying areas or storm drain system.
The
significance of the year 2012 flood disaster in Nigeria lies in the fact that
they were unprecedented in the past forty years. Most parts of the central
states of Nigeria and other adjoining states along the river Niger and Benue
are devastated by these floods causing huge destruction to the rural and urban
infrastructures (farmlands/crops, roads, buildings, damages, bridges, power
lines e.t.c ) and socioeconomic lives of the areas. Floods occur when the soil,
stream channels and man-made reservoirs cannot absorb or contain all the water.
A flood that occurs suddenly with little or no prior signs, is called a flash
flood and is due to intense rainfall over a relatively small area, it us
inevitable resulting from the natural rainfall runoff process. It is a natural
phenomenon and its magnitude is periodic. The periodicity of flood implies that
every year some area surrounding the river (on both sides) is flooded.
Flood
disaster management like other disasters management can be grouped into phases;
the preparedness phase where activities such as prediction and rusk zone
identification or vulnerable mapping are taken up long before the event occurs,
the prevention phase where activities such as forecasting early warning,
monitoring and preparation of contingency plan are made before or during the
event, and the response and mitigation phase where activities are undertaken
after the disaster and these includes damage assessment and relief management
(Van Western et al., 1993).
1.2
Problem Statement
In
the last three decades, the
impacts of flooding
have increasingly assumed from significant to threatening
proportions, resulting in loss
of lives and properties. Though detailed statistics are
not available regarding the losses
sustained by the urban dwellers and flood
victims, it is
obvious from the available record
that irreparable havocs have been
sustained by the citizen of
Nigeria due to what has become
perennial natural disaster in our
cities. Apart from
houses that collapse by flooding, schools buildings and bridges
sometimes collapse as well. Markets places and farmlands
are submerged for weeks and
sometimes are washed away. Hence
flooding in Nigeria needs to be assessed.
1.3
Objectives of the Study
The
major objectives of the study is causes effects and solution to flooding in
Nigeria.
1.4
Research questions
(1)
what is flooding?
(2)
what are the causes of flooding in Nigeria?
(3)
what are the detrimental effect of flooding in Nigeria?
(4)
what are the ways to proffer solution to flooding in Nigeria?
1.5
Significance of the Study
The
research gives a clear insight into the causes, effects and solution to
flooding in Nigeria. The research will help to identify the areas that are
prone to flood. It will also help to know the ways to mitigate the effect of
flooding.
1.6
Scope of the Study
The
research focus on the causes effects and solution to flooding in Nigeria.
References
Ifatimehim
and Ufuah, M.E (2006). Analysis of Urban Expansion and Loss of Vegetation in
Lokoja using GIS Techniques. Zaria Geographers, 17(1): 28-36.
Ifatimehin,
O.O., Musa, S.D. and Adeyemi, J.O. (2009). An analysis of the changing land use
and Its impact on the Environment, Anyingba Town, Nigeria. Journal of
Sustainable Development in Africa 10(4): 357-364.
Van
Western, C.J.I., Van Duren, H.M.G. Kruse and M.T.J. Terlien (1993). GIZZI:
Training package for Geographic Information Systems in Slope Instability
Zonation. International Institute for Aerospace Survey and Earth Science (ITC),
15(1): 245 pp. Enschede, The Netherlands.
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