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117 Figure C- 1: Origination Counties in the Chicago Region
118 Figure C- 2: Destination of Grain Shipments, Parishes in the New Orleans Region Base Case The base case describes shipping modal choice during supply chain operations. The analysis was to consider the movements of cereal grains by the inland waterway between the Chicago and the New Orleans metropolitan areas. However, in the original version of the model, inland waterway movements were not represented as an option for grain shipments, even though barge movements of grain do occur. To define a proper base case scenario, the water mode paths to inland waterways had to be activated. This allowed the model to simulate grain movements according to the scenario. No other changes were made to the model. Without the unit cost and time between the origin area and the destination for the inland waterway paths, the model would not be able to assign any traffic to the waterway mode. To accommodate the study, CMAP staff calculated the unit costs and times with this mode of travel and added them to the input file for the base case. This change was essential to properly represent grain waterway movements for the base case. Error! Reference source not found.1 shows the statistics associated with these unit costs and times. Paths 1 and 2 both represent movements on the inland waterway and differ only slightly based on which ports were used as the origin. The travel time for the shipments on the waterways between the origin and destination is roughly 18 days. This is consistent with the speed at which barges travel down the river, at between 1.5 to 3 miles per hour with roughly 925 miles between Chicago and New Orleans.
