PREVENT EROSION OF LANDS effective way to prevent trouble Is to build terraces lay out with farm level prepared by the states department of agriculture throughout many parts of the united states the billy and rolling lands are subject to erosions ero from the heavy winter rains an effective way to present this erosion la to build terraces preferably not less than 15 feet wide effi yf fi M land terraced to prevent erosion that hive been carefully laid out with a good farm level it Is much easier to save lands from washing away by means of terracing than it Is to attempt to build up washed and gullied felds gelds