How full is full?

[RJordan]

Regulations for my local area and state both specify min/max velocities for wastewater lines and give associated grades. Resources I've found online all say something to the effect of "...slopes sufficient to allow a velocity
when flowing full of not less than xx feet per second". I'm curious what others use as "full". Opinions with my coworkers vary. When I reverse calculated minimum slopes for pipe sizes I found the tables use ~50%.

 

[bimr]

This question was answered recently:

http://www.eng-tips.com/viewthread.cfm?qid=344016

 

[RJordan]

Thank you bimr. I'll work on those search skills.