Geo-Characterisation of Highway Construction Cost Drivers in the Niger Delta Region of Nigeria

Abstract

This study explores the geologic peculiarities of the Niger Delta region, which creates a propensity for the significantly high cost of highway development. The heterogeneous geologic configuration of the area, in terms of its landscape, geomorphology and hydrology are descriptively and techno-economically analysed, based on available local literature, supplemented by geotechnical field work data. The study discusses and analyses the construction cost implications of the inherent geo-variability of the terrain, and the financial implications as it relates to the practicalities of carrying out road construction in the Niger Delta. The analysis outlines the cost considerations associated with highway pavement and drainage construction in view of the hydro-geomorphological setting of the Niger Delta. The analysis reiterates the predominance of fined grained subgrade soils, which will require remedial re-engineering measures and significant construction costs. Furthermore, the study highlights the increased costs of drainage construction in view of the significant volume of precipitation surplus and relief of the region. The study submits that recognising the challenges and cost associated with the adverse geo-configuration of most parts of the Niger Delta, is a necessary starting point to maximise value for money in highway projects.