PREVENTION OF EROSION BY TERRACING. 11 
which collects above the terraces, and the sodded surface prevents 
erosion of the terrace due to impounded water overtopping it. 
This type of terrace is cheap to construct, easy to maintain, and — 
affords a very convenient guide row in plowing and planting. The 
8 
Width of Bench for Horizontal Bench Terraces, in Feet 
Las) 
DS 
Average Slope of Land in feet per Hundred 
_ Fie. 4.—Horizontal-bench terraces. Curves showing width of bench for different land 
slopes and vertical distances between terraces. 
principal objections to its use are (1) the land occupied by the sodded 
terrace reduces the total amount of tillable land in the field; (2) 
the growth on the terrace saps the strength from the adjoining soil, 
resulting in a dwarfed plant growth on either side of the terrace; 
