Freshwater wetlands

No freshwater wetland, as defined in this ordinance, shall be excavated, drained or filled, nor shall any extraneous material be placed into a wetland or water flow diverted into or out of a wetland by a dike or dam, or any other changes which add to, take from or otherwise alter the character of any freshwater wetland undertaken, without the prior approval of the director of the department of environmental management and the Town of Tiverton as set forth in G.L. 1956, § 2-1-21.