Assessment of Geologic Controls of Flooding in Parts of OBIO/AKPOR L.G.A., Rivers State, Nigeria

Eruebi Toju B (Department of Geology, University of Port Harcourt, Rivers State, Nigeria)
Eze Uchechukwu Stanley (Department of Marine Geology, Nigeria Maritime University, Okerenkoko, Nigeria)
Ibitoye Taiwo Abel (Department of Petroleum Engineering and Geosciences, Petroleum Training Institute, Effurun, Nigeria)
Abolarin Olayiwola Macpaul (Department of Petroleum Engineering and Geosciences, Petroleum Training Institute, Effurun, Nigeria)

Abstract


Flooding of Municipal areas is a frequent environmental occurrence in Rivers State that occurs when rainfall runoff meets land surfaces with low water absorbing capacity or when it overwhelms drainage channels. In order to assess the flood situation in the study area, an integrated method which involves Field-measurement, Geographic information system (GIS), Laboratory analysis of soil samples and topographic studies were employed. Digital Elevation Model of the study area reveals that the flooded areas are situated in areas with elevations lower than its surrounding, thereby acting as a natural basin to retain flood waters after rainfall. Four holes were drilled to depth of 3m to obtain soil samples at 1 m sampling interval, from which laboratory analysis was carried out to determine some geotechnical parameters such as soil’s particle size, specific gravity, bulk density, porosity, moisture content, permeability and hydraulic conductivity. Results from the analysis show that permeability, hydraulic conductivity and porosity diminishes with respect to depth. The soil in the flooded areas have high fines content (silt and clay), high bulk density which increase with depth and a specific gravity that is typical of organic rich soils that contain sand mixed with a considerable amount of fines. At Nkpolu, mean permeability rates of 0.003cm/sec, 0.009cm/sec and 0.033cm/sec were obtained at 1, 2 and 3m respectively. At Eneka, mean permeability rates of 0.011cm/sec, 0.018cm/sec and 0.014cm/sec were obtained at 1, 2 and 3m respectively, while at Rukpokwu, mean Permeability rates of 0.021cm/sec was obtained at 1m, while 0.006cm/sec was obtained at 2 and 3m respectively. The Mean hydraulic conductivity for the locations under study is of the order of 10-4ft/day. This study has shown that the flooded areas are located in low lying urban areas which act as basins, therefore, the top soil is crusted with highly compacted soil horizons beneath. With high and frequent rainfall in the region which generates a lot of runoff, in addition to poor drainage system, flooding of the study area occurs frequently. Therefore, construction and maintenance of efficient drainage channels for an effective solution to urban pluvial flooding in the study area are thereby recommended.


Keywords


Pluvial flooding, Risk assessment, Soil sample, Soil properties, Topography.

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References


[1]Okujiaku, C. and Ngozi, C. (2014). Urban Flood Mitigation Using Geographic Information Systems. Proceedings of the 2nd International Conference on Flood and Erosion Prevention, Protection and Mitigation held in Rivers State. 2014. 305-320.

[2]Abam, T. K. S., Gobo, A. E., and Ede, N. (2014a). Flood Prevention in Portharcourt, Rivers State, Nigeria. Proceedings of the 2nd International Conference on Flood and Erosion Prevention, Protection and Mitigation, held in Rivers state, 2014. Pp 161-175.

[3]Abam, T.K.S., Gobo, A.E., Ngah, S.A., and Eze, C.L. (2014b): Pronosis of Discharge Distribution and Effects on Flood Mitigation in the Niger Delta. Proceedings of the 2nd International Conference on Flood and Erosion, Prevention, Protection and Mitigation held in Rivers state, 2014. Pp 176-190.

[4]Ogba, C., Inah, O., and Marcus, I. (2009). Application of Geographic Information System (GIS) Towards Flood Management in Calabar, Nigeria.. Proceedings of the FIG Working Week 2009. Eilat, Israel, 3-8.

[5]Daudu, P. I., Yashi, J., Yisa, G. L., and Akaa, G. (2014). Road flooding: Causes, Effects and Mitigation Measures. A case study of Oju Ore Road, Ado-Odo Ota Local Government Area of Ogun State. Proceedings of the 2nd international conference on flood and erosion prevention, protection and mitigation held in Rivers State, 2014. Pp 267-276.

[6]John, D. N. and Peter, A. E. (2014). Flooding implications of Land use and Cover Dynamics in Proximate Peri-Urban areas of River Otamiri Watershed in Owerri Metropolis of Southern Nigeria.Proceedings of the 2nd International Conference on Flood and Erosion Prevention, Protection and Mitigation held in Rivers State, 2014. Pp 365-376.

[7]Nwigwe, C. and Emberga, T.T., (2014). An Assessment of Causes and Effects of Flood in Nigeria, Standard. Scientific. Research journal. p1-50.

[8]Ogbanga, M. M. (2015). Impacts of Flooding Disaster on Housing and Health in Two Communities of Ahoada East and West Local Government Areas of Rivers State. Nigerian Journal of Agriculture, Food and Environment. 11(1):44-50.

[9]Oloyede, k., Adetimirin, Oluwafemi, I. and Adebumi, O. A. (2014). Flood Assessment in Settlements Using Spatial Technology. Proceedings of the 2nd International Conference on Flood and Erosion Prevention, Protection and Mitigation held in Rivers State, Nigeria, 2014. 144-160.

[10]Slaughter, A., and Adati, A. K. (2012). Oil Exploration and Spillage in the Niger Delta of Nigeria. Civil and Environmental Research Paper. Vol 2, No.3.

[11]Ferdinand, F. O., Daminabo, Anthony, D. E. (2014). Climate change and the increasing risk of flooding in the built environment. Proceedings of the 2nd international conference on flood and erosion prevention, protection and mitigation held in Rivers State, 2014. Pp 356-364.

[12]Eludoyin, 0. S., Wokocha C. C., and Ayolagha, G. (2011). GIS Assessment of Land Use and Land Cover Changes in OBIO/AKPOR L.G.A., Rivers State, Nigeria. Research Journal of Environmental and Earth Sciences 3(4): 307-313.

[13]Tonkin and Taylor (2014). Increase Flood Vulnerability: Geological Processes Causing Increased Flood Vulnerability. Report: Chapman Tripp on behalf of the Earthquake Commission (EQC). 1-30.

[14]Faghih, M. and Tan, P. Y. (2015). GIS Techniques for Flood Modeling and Flood Inundation Mapping. Vol. 20 [2015], Bund. 16.

[15]Elenwo, E.I., and Akankali, J.A. (2014). Environmental Policies and Strategies in Nigeria Oil and Gas Industry: Gains, Challenges and Prospect. Natural Resources, 5, 884-896. http://dx.doi.org/10.4236/nr.2014.514076.

[16]Reijers, T (2011). Stratigraphy and sedimentology of the Niger Delta. Journal of Geologos, Vol.17 (6). January-2008: P.133-162.

[17]Kulke, H. (1995). Nigeria in Kulke H, ed. Egional Petroleum Geology of the World. Part II: Africa, America, Autralia & Antartica. Berlin, Gebruder Bomtraeges, pp 143-172.

[18]Hospers, J. (1965). Gravity Field and Structure of the Niger Delta, West Africa. Geological Society of American Bulletin. Vol. 76, pp 407-422.

[19]Reijers, T.J.A., Petters, S.W. and Nwajide C.S. (1997). The Niger Delta Basin in Selley R.C, ed. African Basins – Sedimentary Basins of the World 3. Amsterdam. Elsevier Science. Pp151-172.

[20]Burke, K. (1972). Longshore Drift, Submarine Canyons and Submarine Fans in the Development of Niger Delta. America Association of Petroleum Geology. Vol. 56, pp 1975 -1983.

[21]Short, K.C. and Stauble, A.J. (1967) Outline of the Geology of Niger Delta. American Association of Petroleum Geologists Bulletin, 51, 761-779.

[22]Odumodu, C.F.(2011). Geothermal Gradients and Burial History Modelling in Parts of the Eastern Niger Delta, Nigeria. University of Nigeria. Virtual Library. PhD Thesis.(Online Publication) pp 10-23. Accessed 2nd November, 2016.

[23]Ronnie, F. (2009). Pluvial Flooding and Surface Water Management. 5th EWA Brussels Conference. European Water Management and Implementation of the Floods Directive. 30.

[24]Delgado-Rodríguez, O., Peinado-Guevara, H. J., Green-Ruíz, C. R., Herrera-Barrientos, J., and Shevnin, V. (2011). Determination of Hydraulic Conductivity and Fines Content in Soils near an Unlined Irrigation Canal in Guasave, Sinaloa, Mexico. Journal of Soil Science and Plant Nutrition, 11(3), 13-31

[25]Andre-Obayanju, O., Imarhiagbe, O. J., Onyeobi. (2017). Comparative Evaluation of Geotechnical Properties of Tropical Soils and Anthills from Parts of Edo State for Road Construction. Journal of Applied Science and Environmental Management, 21 (7) 1250-1255.

[26]Kenneth, L., Vos, B. and Ngan Tillard (2009). Effects of Fines on the Mechanical Behavior of Sandy Soils. Section of Engineering geology, Department of Applied Earth Sciences. Pp 1-136. 232-238.



DOI: https://doi.org/10.30564/jgr.v3i2.2902

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