APPCOR11054

• Permit No: C1981031
• IBM Index Class Name: Application Correspondence
• Doc Date: 10/31/1983
• Doc Name: STIPULATION NO. 15 RESPONSES
• From: J F SATO & ASSOCIATES
• To: MLRD
• Media Type: D
• Archive: No

Riprap Sizing and Volume
Ref: Federal Highway Administration, June, 1967. Use of Riprap for
Bank Protection, Hydraulic Engineering Circular No. 11.
Table 1. Riprap Sizing
Section
B-B Q100
C-C Q100
F-F Q100
*See Figure 1
**See Figure 2

K(ft)
Y(ft) K
y
V(ft/sec) V *
Vs
Vs Stone Equiv**
Z Diameter (ft)
0.5 3 .17 6.2 0.6 3.7 4:1 0.5
0 1.3 0 4.7 0.3 1.4 12:1 None
Required
1.0 0.7 1.0 11.8 1.0 11.8 4:1 1.0
Ref: Federal Highway Administration, December, 1978. Hydraulic
Design of Energy Dissipators for Culverts and Channels.
Hydraulic Engineering Circular No. 14.
Table 2. Extent of Riprap
Length of Thickness of
Section D50 (f t) transition (ft)* riprap (ft)
B-B 0.5 5 1.0
F-F 1.0 10 2.0
*Transition between riprapped areas and unprotected areas.