The commissioner of environment and conservation shall study and from time to time submit to the governor and to the general assembly proposals for the addition to the state scenic rivers system of rivers and sections of rivers which, in the commissioner's judgment, fall within one (1) or more of the categories set out in §11-13-103. Each proposal shall specify the category of the proposed addition and shall be accompanied by a detailed report on the factors which, in the judgment of the commissioner, make the area a worthy addition to the system. The intention of this requirement is to ensure that such studies will be made; it is not intended to preclude or discourage studies and proposals by other agencies or by citizen groups working independently or with the department.