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Does the plan benefit commercial navigation?

This is the eighth of nine Study Board decision criteria used in the evaluation of Lake Superior regulation plans. The Study Board preferred plans that at least preserved or even decreased shipping costs on the Great Lakes. It considered changes from Plan 1977A costs, looking at average annual, worst year and best year, and frequency-magnitude distributions of annual benefits. The Study's Shared Vision Model (SVM) was used to provide comparisons of the impacts on commercial navigation interests of different plans. Costs were computed for 10 routes reflecting possible combinations of shipping origins and destinations. For example, Route 1 (Lake Superior) was for shipments from one Lake Superior port to another. In this case, the levels on Lake Superior were the only levels needed to calculate these costs. Route 6 (lakes Superior-Michigan-Huron-St. Clair) included shipments between Lake Superior and Lake St. Clair ports, and the levels on lakes Superior, Michigan-Huron, and St. Clair as well as the St. Clair River and three points on the St. Marys River, were needed to calculate costs. The SVM included “drop” menus to control basic assumptions underlying the calculations that created the values, and computed the gross costs, the net improvement compared to 1977A costs, the net improvement as a percentage of 1977A costs, and the best and worst years in terms of net costs for each plan on each route.
Related Projects
Commercial Navigation Performance Indicators
Commercial Navigation Summary
Plan Formulation and Evaluation Strategy
Shared Vision Modelling
Lake Superior Plan Formulation