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Source: https://erdc-library.erdc.dren.mil/jspui/ ; A systems analysis of the inland waterways that affect or that might be affected by the replacement of the Oliver Lock on the Black Warrior River was conducted to determine the benefits (or costs) of such a replacement. The present lock is smaller than the other locks on the Black Warrior-Tombigbee (BWT) Waterway and is a major point of congestion and delay to tow traffic. The analysis of the benefits of replacing this lock is complicated by the opening of the Tennessee-Tombigbee Waterway (TTW), which junctions with the BWT just above Demopolis Lock and Dam. This brings together traffic from two waterway systems on an existing waterway with two locks and many difficult bends. In order to conduct such an analysis, an evaluation methodology and procedure had to be developed to measure total system performance. By evaluating the economic performance of the system for the existing and proposed improvement at Oliver Lock and Dam, the marginal system benefits attributable to this improvement can be measured. Project feasibility and benefits can then be determined. In analyzing a lock and dam project, the interdependence of traffic flows between the many individual elements of the system must be taken into account. A change in the performance capabilities of one lock or channel segment can affect the efficiencies of other components in at least two ways -- by increasing aggregate service demands at other structures, and by changing the economic and physical characteristics of the traffic. Conversely, the capabilities of other components of the system can restrict traffic flows at the project under study and prevent the materialization of expected benefits. Both situations were very real factors that had to be accounted for in this investigation. The modeling system employed in this study consists of a series of interlinked computer programs and simulation models. The basic components of the system are the Tow Cost Model (TCM) , the Waterway Analysis Model (WAM), and ...