. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. PBEVENTION OF EROSION BY TERRACING. 9 Figure 3 shows a cross section of two adjacent sloping-bench ter- races, with the various dimensions designated by letters for reference. Surveys were made of a number of fields in the Piedmont sections of Georgia and South Carolina which have sloping-bench terraces. The average dimensions of the terraces in each field were determined. The minimum and maximum of these averages are shown in the fol- lowing table: Actual dimensions * of sloping-hench terraces. Dimens
. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. PBEVENTION OF EROSION BY TERRACING. 9 Figure 3 shows a cross section of two adjacent sloping-bench ter- races, with the various dimensions designated by letters for reference. Surveys were made of a number of fields in the Piedmont sections of Georgia and South Carolina which have sloping-bench terraces. The average dimensions of the terraces in each field were determined. The minimum and maximum of these averages are shown in the fol- lowing table: Actual dimensions * of sloping-hench terraces. Dimension. Height of shoulder, Width of upper side of shoulder, 6 do Vertical distance between terraces, v do Ratio ofctod per Slope of land do Field averages. Minimum. Maximum. 58 121 28 A comparative study was made of the conditions existing in the fields and the data obtained from the surveys with a view to ascer-. FiG. 3.—Cross section of two adjacent sloping-bench terraces. taining proper values to use in constructing a terrace of this style. The best terraces were found where the greatest height and width of shoulder were used with the smallest vertical distance between the terraces. It is believed that the height of shoulder (h) should be not less than foot for horizontal-bench terraces or less than 1 foot for newly constructed sloping-bench terraces, and that the width (h) should be not less than 2 feet for the former or less than 3 feet for the latter. The vertical spacing between the terraces should be gov- erned by the type of soil, the slope of the land, and the ease of start- ing and maintaining a heavy sod on a steep and high embankment. The best practice indicates that this spacing never should be less than 3 feet or more than 6 feet. The smaller spacing should be used on gently sloping land while the greater spacing applies to steep land. The question of proper spacing depends to a great extent upon the care a
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