Land Management Specialist: Building the Glenn Canyon dam on the Colorado river caused unforeseen environmental effects. One of these is that, by preventing annual floods, the dam prevents the river from stirring up sediments collected on the river bottom and depositing them high on the banks of the river. The deposited sediments are needed to create and maintain sandbars, which form natural habitats for native fish. By releasing water from the dam annually, we will flood the river and thus recreate the sandbars normally found below the dam. Which of the following must be true if the prediction of the land management specialist above is also to prove true?