PREVENTION OF EROSION BY TERRACING. 35 
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 with 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 
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Fic. 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 
