Section 16. The commissioner shall at least once every 5 years, adopt after public hearing one or more periodic watershed management plans for the watershed system, which shall have been prepared with the participation of a professionally qualified forester and the appropriate watershed advisory committee. Any watershed management plan shall provide for, but need not be limited to, forestry, water yield enhancement and recreational activities. All forestry activities shall be subject to sections 40 to 46, inclusive, of chapter 132.