Study And Design Of Erosion Control Structures For Ndoro, Ikwuano L.G.A. Abia State

Abstract

The study and design of Erosion control structures for Ndoro. lkwuano L.G.A. Abia State was carefully carried out the parameters needed for the design were well defined b identifying the major causes of gully erosion in the site as a result of poor sanitation of' the community. People using the already existing erosion control structures as a refuse dump site which over time had blocked the channel part, creating a parallel channel instead of the installed channel, thereby causing the gully formation. The lined trapezoidal channel were designed carrying 2.4m7s. the slope calculated as 1.4%. velocity of flow 3.58rn/s while the catchment area was estimated as 25 hectares. A roughness coefficient of 0.015 was used, while runoff coefficient of 0.48 were selected. a trapezoidal channel of bottom width 0.82m. depth of flow 0.49m. and top width 2.78m were designed respectively to control the erosion by conveying the runoff to Aqua-Ibo River which serve as the outlet discharge point using this type of channel, the runoff will be safely discharged and the gully site totally reclaimed.