PERMFILE46940

• Permit No: C1980001
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: SCS Technical Note No. 25, Appendix A
• Section_Exhibit Name: 4.3 Appendix 4.3-A
• Media Type: D
• Archive: No

6-99
Appendix A
ne ~ nt + no (see 7th step. page B. 6, Supplement B,
• NEH-S)
0.0333 + 0.005
= 0.0383
Se ~ So ~ 0.00520
_ (0.0333l0.0383)~ 0.00520 ~
= 0.00393
Tall. 4 dm ,
= 4 0.03609
1:444 pounds per sq. ft.
Tact. -Tall.
YR SL = 4 dm
= 1.444/(62.4 0.00393)
= 5.884 ft
y = R = 5.884 ft
gmax = (1.486/ne)yx/~ o
_ (1.486/0.0383)(5.884)x/3 0.005 0
= 53.6 cfs/ft
(b) Dd dm/[(100 - m)/100]
= 30 0.3609
= 3.61 ft
Therefore, the maximum steady-state unit discharge that would limit scour
• by permitting armoring is approximately 54 cfs/ft. The expected depth of
degradation before complete armoring (one layer) is almost 4 feet.