Please why did you use your first PE (65) instead of the total PE (353) in your peak flow factor calculation? Wonderful video by the way, by far the most detailed explanation out here.
Assalamulaikum Dr. Usually I used Colebrook-white equation for sewerage design for IWK. Is it any significant difference between Colebrook-white equation and Manning equation? Thank you
GL start is where the sewerage line start and gl end is where the sewerage line end. GL diff is different between start and end level. Drop level is different between end level and start level at the point or grid.