Bui. 852, U. S. Dept. of Agriculture, 
Plate VI 
Diagram for Use in the Design of Concrete Pipe 
Lines. 
From the intersection of the diameter and C s follow guidelines to the 
intersection of H and V, or from the intersection of H and V follow 
guide lines to the intersection of diameter and C a . No straight 
edge required. _ For recommended values of C a , see page 7. 
