Bul. 1358, U. S. Dept. of Agriculture PLATE XII 
F159689 
Fic. |.—FACING WATER SLOPES OF DAMS IS SOMETIMES ADVISABLE 
A bowlder riprap of the water slope, although expensive, provides protection against wave 
cutting 
F172849 
FiG. 2.—UNDERCUTTING OF AN EARTHEN DAM WILL RESULT IF THE 
SPILLWAY DISCHARGES ITS OVERFLOW WATERS ALONG THE LOWER 
FACE OF THE DAM 
