The Scenario Manager allows editing of a small portion of a RiverWare model without affecting the integrity of a baseline model. With the Scenario Manager, the values of a subset of slots can be altered independently of the baseline model. Models can be viewed and run using these various scenario values without corrupting the values in the baseline model. The Scenario Manager provides a convenient interface to load, edit, and save values for these slots, run the model using these different slot values, and compare the baseline values with the scenario values.