I think I've found what I need. AWWA standard C651 states that the min flushing velocity should be 2.5 ft/s. Thanks for the help, I appreciate all the responses.
Do you know of any references that give the generally accepted minimum velocity? I've checked quite a few civil eng. handbooks and water system design books and I can only find references for min. velocities in waste water, drains, etc. but not for potable water. Thank you.
I am working on a design for a replacement pipe line for potable water. I am looking for a published standard or guidline that states what the minimum velocity in a potable water pipe should be. Thank you.