Whenever the duties of the head of any existing department, division, board, commission, or other agency or of any other officer are prescribed by law, and the duties of such person have been or shall in the future be transferred to the department of environmental management under this chapter, the director of the department of environmental management may designate some officer or other subordinate within his or her department to perform such duties; provided, however, that any other provision of this chapter notwithstanding, the functions, powers and duties of the chief of the division of parks and recreation as set forth in title 32, entitled “Parks and Recreational Areas,” as amended, in chapter 22.5 of Title 23, entitled “Drowning Prevention and Lifesaving,” as amended, and in any other general or public law, and the functions, powers, and duties of the chief of the division of harbors and rivers as set forth in title 46, entitled “Waters and Navigation,” as amended, and in any other general or public law, shall not be diminished; provided further, however, that all planning and law enforcement functions, powers, duties, and personnel shall be transferred to the divisions established by §§ 42-17.1-4(5) and 42-17.1-4(6) of this chapter.