Are right angles (90 degree bends) efficient for the sewer?
It is true that a 90 degree bend is not desirable, but the conditions in the neighborhood mandate the use of a few 90 degree bends. The Interceptor Sewer design has taken into consideration momentum losses at the 90 degree bends. While the head losses from a 90 degree bend are significant during low flow conditions, they are not significant during peak flow conditions when the pipeline is flowing under full pipe conditions. In well-established neighborhoods, 90 degree angles are virtually unavoidable. Otherwise, many easements would be required, homes would have to be demolished, and the expense of the project would be dramatically increased.
