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. Estimating sediment deposition in a stream, a standard procedurefor dealing with aggradation problem is complicated in an ungauged catchmentdue to the absence of necessary flow data. A serious aggradation problemwithin an ungauged catchment in Alabama, USA, blocked the conveyance of abridge, reducing the clearance under the bridge from several feet to acouple of inches. A study of historical aerial imageries showeddeforestation in the catchment by a significant amount over a periodconsistent with the first identification of the problem. To further diagnosethe aggradation problem, due to the lack of any gauging stations, localrainfall, flow, and sediment measurements were attempted. However, due tothe difficulty of installing an area-velocity sensor in an activelyaggrading stream, the parameter transfer process for a hydrologic model wasadopted to understand/estimate streamflow. Simulated discharge combined witherosion parameters of MUSLE (modified universal soil loss equation) helpedin the estimation of sediment yield of the catchment. Sediment yield for thecatchment showed a significant increase in recent years. A two-dimensionalhydraulic model was developed at the bridge site to examine potentialengineering strategies to wash sediments off and mitigate furtheraggradation. This study is to quantify the increase of sediment yield in anungauged catchment due to land cover changes and other contributing factorsand develop strategies and recommendations for preventing future aggradationin the vicinity of the bridge.

Framework for quantifying flow and sediment yield to diagnose and solve the aggradation problem of an ungauged catchment