This work addresses the gully erosion problems of the Nanka/Agulu area of Anambra State,
Nigeria. Field reconnaissance and observation visits were made to five (5) major erosion sites
in the study axis between the months of November, 2011 and February, 2015 to obtain a firsthand and on-the-spot assessment of the degree of erosion menace in these areas, and to collect
soil samples for laboratory analyses. The collected soil samples were subjected to visual
inspection before classification tests. The investigation/field work was carried out and
conducted in accordance with the guidelines given in the general specification (erosion
control) vol.11 of the Federal Ministry of Works and Housing, and where necessary, the
British Code of Practice for site investigation (C.P.2089). The representative soil samples
were subjected to the Natural Moisture Content, Atterberg Limits, Mechanical Sieve Analysis,
Compaction and Triaxial Compression tests to ascertain their nature, texture and erodibility.
Data obtained from the sites and from these tests were inserted into mathematical formulations
on the management of erosion problems. This enabled the quantification of the soils' erodibility,
erosion estimation and the recommendations on the management of the erosion problems in the
study axis. With data obtained at the sites, computations and designs of Revetments along the
sides of the Gullies, design of Run-off/Flood Drainage Channels, and, design of Run-off/Flood
and Sediment Retarding Structure (Sedimentation Weir) were carried out. Results revealed that
proper Soil Conservation Designs, Flow Velocity Control, Reduction of Soil Segregation(Rainfall
Erosivity), Soil Conservation Measures, proper Management of Human Activities. Application of
Agro-forestry. Ground Cover Establishment, and, construction of necessary Erosion Control
Structures at the proper locations in the study-axis will adequately help in checking the erosion
problems.
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