PREVENTION OP EROSION BY TERRACING. 



S6 



No attempt is made to give comprehensive instructions for laying 

 out terraces since different topographical conditions will suggest 

 different methods of procedure to the levelman of good judgment and 

 experience. The best results are obtained vs^ith a good leveling in- 

 strument in the hands of a careful, competent, and experienced 

 levelman. 



CONSTRUCTION OF TERRACES. 



All types of terraces are constructed originally in the same way. 

 The work of construction should begin invariably with the highest 

 terrace in the field and each terrace should be completed before work 



Contours. . lOO — > 



Terraces liiiiiiiiiuiiilllll 



loa so 



Fig. 16. — Field of graded- ridge terraces. 



is started on the one next below. The late fall and early winter is 

 the best time to lay out and build terraces. If one has not time to 

 terrace his whole field well it is better to construct well the first few 

 terraces near the upper side of the field than to terrace the whole 

 field poorly, for a break in a terrace near the upper side of the field 

 is followed by breaks in all below. 



The terrace embankment can be built up wholly with an ordinary 

 turning plow. A large sixteen-inch plow with an extra large wing 

 attached to the moldboard for elevating the dirt, is an effective 

 implement for throwing up a high terrace bank. For broad terraces 

 furrows are thrown toward the center line from each side for a strip 



