AN ASSESMENT OF GROUNDWATER POTENTIAL OF NANKA GULLY EROSION SITES IN SOUTH EASTHERN NIGERIA USING AQUIFER PARAMETER, TRASMISSIVITY.

Abstract

The study area lies in the humid tropical rainforest belt of Nigeria. The landscape is a cuesta within the Awka-Orlu uplands formed by the Nanka formation (early Eocene) and the Imo Shale formation (Palaeocene). The geological, hydro geological, geotechnical and hydro geochemical characteristics of the area and human activity have contributed to gully development and growth. It was observed that there are numerous springs, streams and lakes draining the gully floodplains. The research indicated that increase in hydraulic head produces rapid flow rates that enhance the gullying process during rainy seasons. It was discovered that those exposed lithology, houses lens of water, perched aquifers, and fully saturated aquifer when the erosion, landslides, flooding encounter and exposes highly saturated Nanka formation. The paper therefore examines the potential of groundwater resources of the various gully sites within Nanka gully region in Anambra state.