PERMFILE66600

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Utility Wastes
• Section_Exhibit Name: Appendix N
• Media Type: D
• Archive: No

CMT+W[ATMM
• where:
V = velocity,
n = Manning's roughness coefficient,
R = hydraulic radius, and
S = slope of water surface.
To apply this to the reach of interest, the following assumptions
must be made:
rectangular river channel, width » depth,
n constant, and
• S constant and =S~ (~l.ope of channel bottom).
These assumptions are not unreasonable through the Big Bottom
area. The Manning equation can then be converted to the follow-
ing form:
n s ~a Q.~
where:
B = channel bottom width.
In other words, velocity is proportional to flow to the 0.4 pocaer.
Thus, using the mean Station 1 flow (from 29 to 31 August) of
230 cfs:

4-8