Geotechnical assessment of Akpulu gully erosion site in Ideato North Local Government Area of Imo State, Nigeria

Date

2013-02

Journal Title

Journal ISSN

Volume Title

Publisher

Federal University of Technology, Owerri

Abstract

This study was carried out to assess the surface processes and subsurface characteristics that contribute to the formation and expansion of gully erosion in Akpulu - Ideato North County, Imo State Nigeria. Part of Akpulu community especially Okwu village that is very close to the gully head may submerge in the next few years if control measures are not intensified. A gully measured 15-18 m deep, 9-12 m wide to 6.5 km long is advancing aggressively, threatening life, property, food production, and security of ecosystem in Akpulu and its environs. Analysis of soil samples collected from accessible portion of the gully depths of 3 m show peculiar geotechnical characteristics ranging from Liquid limits 27.5 – 30.4%, Plastic limits 17.35 – 22.75%, and Plasticity index 7.65-13.70%. The soil has highclay/silt content, with ranges of maximum dry density (2.01- 2.06g/m3), Optimum moisture content (12.1-13.4%), and average shear strength of 106.9KN/m2 It is easily erodible, as the silt gets dissolved by high velocity flood on 0.02 flow gradient. Expansion and maintenance of the main drainage channel from Umuchu to Akpakporo River in Apkulu is recommended. Secondary drainage channels to join the main channel, and increased trees planting from the gully head are also recommended.

Description

This Thesis is Award of Degree (Masters of Science ) M.Sc. in Environmental Technology. It contains Map and Graphs

Keywords

Geotechnical, gully erosion, soil, control, impact, assesment, Department of Environmental Management

Citation

Ikechukwu. O. (2013). Geotechnical assessment of Akpulu gully erosion site in Ideato North Local Government Area of Imo State, Nigeria . (Unpublished masters Thesis). Federal University of Technology, owerri .

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