Bui. 512, U. S. Dept. of Agriculture. 



Plate VI. 



Fig. 1.— View Showing Graded Terrace Washing Badly Due to Erosive Action 



OF Water. 



HilMttt^ 



1 1. 





''' •; ;r^ 



^■t0- ■»■'■ ■ ■■ ; • 



yi'f/|i^^^H 





^^'^~2 





FiQ. 2.— Terrace Drag with Metal Cutting Edge for Building Up Terraces. 



