Failure or neglect to properly utilize an allocation of water made under this Act, abuse or misuse of any allocation, or complaints filed with the Department in writing, shall be cause for the Department, in its discretion, to hold a hearing for the purpose of taking evidence or gathering other information or data with reference to such subject matter. All persons who may appear in behalf of or in opposition to the petition shall be heard. The Department shall at the conclusion of such hearing enter an order presenting findings and directing a course of action, including changes in allocations previously made.