2001-12-11_PERMIT FILE - C1981038A ‎(2)‎

• Permit No: C1981038A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: VOLUME 8A - Diversion Appendix/Capacity of Channel
• Media Type: D
• Archive: Yes

-2-
Design for Stability
(• 1. Assumed maximum permissible velocity during PMF = 8 ft./s.
2. Slope = 5X
3. Assume very high vegetal retardance

Trial No. ~
VR 1
R 1.49Rs/3S~/2 /
. .. n
1 0.080 8.0 1.00 4.16
2 .100 4.4 .55 1.23
3 .060 20.0 2.50 25.58
4 .070 9.5 1.19 6.34
5 .065 13.0 1.63 11.51
6 .064 13.5 1.69 12.45
~. 7 .066 11.5 1.44 9.24
8 .062 14.9 1.86 15.15 say ok
~/ S = 0.05
Vmax = 8 f.p.s.
R = 1.86'; A = 5E = 68.75 ft.2
Hydraulic properties of channel cross-section (Figure 5, text):
Freeboard = 2'.
Flow Depth = 3'
4letted Perimeter = 35 ft. (approx.)
Hydraulic Radius = 2.7' ~~
Note: 550 c.f.s. capacity needed in 5lest-
Approx. Grade = 5X moreland Canyon; ho~~rever; dtscharge •
at node 13 (Plate I) is approx. 850 c.f.s
n = 0.06
Flv~r Velocity at Flood Stage = 10.7 ft./s.
F'ax. Capacity = 103 x 10.7 = 1100 c.f.s.