Originally Posted By: BillSD
Actually I believe Brettski is in error (sorry) in stating that the cut out section of the pipe in the picture above would minimize vortex formation.


agreed; thx for the tuneup
from Pub 590:
Quote:
A hood-inlet consists of a
pipe laid in the earthfill (fig. 24). The inlet end of the
pipe is cut at an angle to form a hood. An antivortex
device, usually metal, is attached to the entrance of
the pipe to increase the hydraulic efficiency of the
tube.