Sec. 14. Nothing contained in this chapter shall:
(a) impair the provisions of law or ordinance directing the payment of revenues derived from public property into sinking funds or dedicating such revenues to specific purposes;
(b) impair the powers of any county, township, or municipal corporation to develop or improve port and terminal facilities; or
(c) impair or interfere with the exercise of any permit for the removal of sand or gravel, or other similar permits issued by this state or the United States.