A contract was awarded to the St. Anthony Falls Hydraulic Laboratory
to perform a hydraulic model study of energy losses in a combined sewer for
the Minnesota Highway Department. The sewer is located in the vicinity of
38th street South and Hiawatha Avenue in Minneapolis, Minnesota.
The sewer passes under redesigned State Highway 55. The new highway
design requires a modification of the existing sewer. The proposed new
sewer design includes a change in geometry from the original circular 9.25
ft pipe section to a 4.25 ft high by 16 ft wide box, a length of box section,
and then a transition back to the original 9.25 ft pipe section. The crown
of the pipe is depressed 5 ft to the top of the box section with the invert
remaining at the present grade. The depression of the sewer crown allows
the highway gradeline to be lower than it was for the old Highway 55.
The transition had to be designed so that a minimum of headloss would
result from the change in geometry.
Pabst, Arthur; Pennaz, James.
Hydraulic Model Studies of Sewer Transition.
St. Anthony Falls Hydraulic Laboratory.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.