Mannings n for PVC

[cvg]

I'm looking for a good reference for the use of a "n" value of 0.010 or 0.011 for PVC. Client standard is minimum of 0.014.

 

[RWF7437]

Although you might use a Manning's n of 0.010 for clear water almost every review agency will require you to use an n of 0.013 or 0.014 for stormwater or sanitary flows. The theory is that the pipe walls will become partially clogged of covered by biofilm.

Good luck

 

[saxon]

cvg, Here's a table chock full of Manning's n values for all sorts of materials.

http://www.lmnoeng.com/manningn.htm

Hope this helps.
saxon

 

[cvg]

just what I needed - thanks