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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Evaluating Factors Responsible for Gully Development at the University of Benin
by Okonofua Solomon Ehiz and Uwadia Nicholas Omougbo

The study investigated the factors responsible for the development of the gully at the University of Benin (behind the blocks of flats). The gravity of the problem at the study area necessitated this study with the aim of finding lasting solution to the environmental menace based on the causative factors. The study area was geo-referenced with hand held GPS and the coordinates were converted to Nigeria Transverse Mercator (NTM).Total Station was used to map the gully bed so as to obtain the morphological parameters of the gully. Climatic trend (air temperature and precipitation) of the study area from 1960-2010 were obtained from the Nigerian Meteorological Agency, NIMET. Auger samples were obtained to a maximum depth of 2m from six different locations within and outside the gully area. The following tests were carried out on the recovered samples: Specific Gravity test, Particles Size Distribution test, Atterberg/Consistency test, Compaction test, triaxial test and Permeability test in accordance with BS 1377:85. The geotechnical investigation results show that though the soil is of normal specific gravity, its low clay content as well as low erodibility index coupled with sloppy terrain and improper drain termination predisposes the soil to erosion. Other factors responsible for the development of the gully as discovered during the studies are; high precipitation, lack of erosion control structure, low vegetal cover and bad land use. The morphological data of the gully shows that the average depth, top width, bottom width and the length of the gully are; 10.2m, 18m, 14m and 1.1km respectively. Over 200,000 cubic meters of soil has also been loss in the area in the last two decades. From the causative factors mentioned above, gully control and management measures (structural and non structural control measures) can be developed so as to prevent gully head retreat.
Keywords: gully erosion, catchment, precipitation, soil investigation, environmental problem.
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



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