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You are here: Physical Setting |
Relief and Drainage: Abia State has a variety of landforms,
despite the fact that it is dominated by flat and low-lying land,
generally less than 120m above sea level. The low-lying plain is the
inland extension of the coastal plain from the Bight of Benin. The
central part of the state is characterized by undulating land with many
hills. The highland areas are part of the Enugu - Nsukka - Okigwe
cuesta. This area has an average height of between 120m and 180m above
sea level. From Okigwe (Imo State), this escarpment extends in a
west-east direction and, on getting to Afikpo (Ebonyi State), veers
southeastwards to Arochukwu where it terminates.
There are nine main geological formations from south to north. These
include: The Benin formation (or Coastal Plain Sand), the Bende-Ameki
Group, the Nkporo Shale Group, the Nsukka formation (Upper Coal
Measures), the Igali sandstone (False- bedded Sandstone), the Eze-Azu
Shale Group and the Asu River Group. The principal rivers in Abia State
are the Imo River and its tributary, the Aba River.
Imo River originates from the northwestern part of the state and flows
southwest through Abia and Imo state territories towards the Atlantic
Ocean, passing through the southern parts of Ukwa-West and Ukwa-East
local government areas. Other important rivers include lgwu, Azumini
Blue River and Akwa lbom River.
Climate:
There are two seasons in the year, namely: the rainy season and the dry
season. The rainy season begins in March and ends in October with a
break in August usually referred to as the "little dry season." The dry
season which lasts for four months begins in November. Heavy
thunderstorms are characteristic of the onset of the rainy season. The
total rainfall decreases from 2200mm in the south to 1900mm in the
north. The hottest months as are January to March when the mean
temperature is above 27�C. The relative humidity is usually high
throughout the year, reaching a maximum during the rainy season when
values above ninety per cent are recorded.
Soils And Vegetation: The soils of Abia State fall within the broad
group of ferrallitic soils of the coastal plain sand and escarpment.
Other soil types include alluvial soils found along the low terrace of
the Cross River and other rivers. The soils are not particularly fertile
and are prone to much ". leaching because of heavy rainfall. The main
eco- logical problems in the state are sheet and gully erosion.
The vegetation in Abia State is ordinarily considered part of tropical
rain forest which is the dominant natural vegetation in most parts of
southern Nigeria.
The northern part of the State has rich Savannah vegetation of which the
bamboo (Dendrocalamus strictus) is a typical grass species. The economic
trees of the rainforest community are extremely numerous in species and
varied in sizes, but the oil palm appears to be the most important.
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