Abstract
ABSTRACTStream channel enlargement occurs in response to change in streamflow regime accompanying the conversion of the natural rainforest cover to different land uses in small headwater basins in Southwestern Nigeria. Stream basins draining areas subjected to traditional agricultural activities tend to develop relatively larger stream channel bankfull cross-sectional areas than those draining areas under fallows of various lengths or forest cover. Stream hydraulic geometry is also significantly altered by agricultural activities. The individual relationship of stream channel width, depth, and velocity to changing discharges, as expressed in the hydraulic exponent values, is shown to change as basin surface passes from one traditional agricultural land use phase to another.
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