The department shall annually prepare a comprehensive plan for the state for the purpose of guiding the development, funding and implementation of programs and activities by the department and other state programs concerned with service development, integration and utilization. The plan shall describe the present and projected needs for development of such programs and set forth the long-range program objectives. The plan shall also include a description of the content and allocation of state and federal funds to all programs, services and activities to be carried out under the plan during the year. The department shall indicate how and to what extent such programs, services and activities will carry out the program objectives set forth in the long-range program plan. The department shall hold public hearings on the plan before adoption of such plan.