The purpose of this section is to regulate and control the modification of the topography of the land by excavating, grading, filling or similar activities. The Town of Manlius finds that the uncontrolled modification of existing topography has resulted in the destruction of the natural ground cover, air pollution, soil erosion, stream and pond sedimentation and alteration and disruption of natural drainageways and has adversely affected the health, safety and general welfare of the inhabitants of the Town.