Bui. 854, U. S. Dept. of Agriculture. 
Plate XII. 
.0150 
.0125 
.0100 
.0090 
.0080 
.0070 
.0060 
.0050 
.0040 
.0030 
.0025 
0020 
0015 
.0010 
.0009 
.0008 
.0007 
,0006 
.0005 
.0004 
.0003 
Ve/ocif/es in Feet per Second 
.5 .6 .7 .8.9 1.0 1.5 2.0 2.5 3.0 4.0 5.0 6.0 70 8.0 9.0 
7 
.08 .10 .15 .20 .25 .30 40 .50 .60 
Mean ff/c/rau/ic Radii in feet 
Curves Used in the Derivation of a Formula Applying to Both Clay 
AND Concrete Tile. 
