PLATE XI 
Bul. 1358, U. S. Dept. of Agriculture 
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Fic. |.—Top LINES OF DAMS SHOULD BE LEVEL 
A flood overflowed this entire dam but failed to wreck it because the waters were spread over 
its entire length instead of being concentrated in low places 
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FIG. 2.—NARROW TOPS AND STEEP WATER SLOPES WEAKEN EMBANKMENTS 
Average-sized dams should be at least 10 feet wide on top and have flatter water slopes than 
outer slopes in view of the rapid narrowing which results from wave cutting and animal 
trampling 
