said pipe being cylindrical, and formed of a strip of material of uniform thickness which enables the pipe to withstand {HEAD ~ compressive loads} experienced by {TAIL ~ culverts} in the ground, 
experienced by
said pipe being cylindrical , and formed of a strip of material of uniform thickness which enables the pipe to withstand { HEAD ~ compressive loads } experienced by { TAIL ~ culverts } in the ground ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH