274 
PACIFIC SCIENCE, Vol XII, July, 1958 
TYPICAL BARRIER SECTION 
SECTION THROUGH 
CENTER LINE OF BARRIER 
Top of roadway> 
SECTION THROUGH CENTER LIME OF ROAD 
-Nest of reinforced, 
concrete pipes 4 feet 
diameter 
UPSTREAM ELEVATION 
'4' Diameter concrete pipe. 
SECTION THROUGH 
CENTER LINE OF STREAM 
TYPICAL RAILROAD CROSSING 
NOTE- 
Concrete stop logs shall be provided at the upper 
entrance of all highway and railway crossings. 
TYPICAL STREAM CROSSING 
DISTANCE IN THOUSANDS OF FEET 
LAVA CHANNEL AREA 
Fig. 8. Drawings showing construction design, ground profile, height, channel width, and channel volume of 
the barrier designed by the U. S. Engineer Department in 1940. (After Jaggar, 1945, figs. 3, 4.) 
