In order to accomplish its purposes, this article uses the following methods:
   1.   Restrict or prohibit uses that are dangerous to health, safety or property in times of flood, or cause excessive increases in flood heights or velocities;
   2.   Require that uses vulnerable to floods, including facilities which serve such uses, be protected against flood damage at the time of initial construction;
   3.   Control the alteration of natural floodplains, stream channels and natural protective barriers, which are involved in the accommodation of flood waters;
   4.   Control filling, grading, dredging and other development which may increase flood damage; and
   5.   Prevent or regulate the construction of flood barriers which will unnaturally divert floodwaters of which may increase flood hazards to other lands.