FLOOD00950

• County: Statewide
• Title: Rock Riprap Design for Protection of Stream Channels near Highway Structures volume 2
• Date: 1/1/1986
• Prepared By: USGS
• Floodplain - Doc Type: Educational/Technical/Reference Information

Evaluation of riprap design procedures (continued)
Evaluation of u.s. Bureau of Reclamation, Engineering
Monograph No. 25 -------------------------------------------------- 78
Description ---------------------------------------------------- 78
Application ---------------------------------------------------- 80
Riprap specifications ---------------------------------------------------- 81
Rock specifications ------------------------------------------------- 81
Shape ---------------------------------------------------------- 82
Durability ----------------------------------------------------- 82
Specific gravity ----------------------------------------------- 82
Riprap-layer specifications ----------------------------------------- 82
Thickness ------------------------------------------------------ 84
Method of placement -------------------------------------------- 84
Toe construction ----------------------------------------------- 85
Gradation of stone --------------------------------------------- 85
Filter blankets ------------------------------------------------ 87
Development of a new procedure for estimating median stone size ---------- 88
Summary comparison of various design procedures -------------------------- 90
Literature survey and references ----------------------------------------- 93

ILLUSTRATIONS

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Figure Page
1. Photograph of erosion of rock riprap on left bank of Pinole Creek
atPinole, California, following flood of January 4, 1982 ------- 2
2, Graph showing comparison of procedures relating velocity to stone
weight (adapted from EM-1601) ----------------------------------- 6
3, Three-dimensional free body diagram of forces acting on a
water mass ------------------------------------------------------ 7
4. Sketches of classification of principal types of riprap failures 10
5-7. Photographs of riprap on left bank of Sacramento River at E-IO
near Chico, California:
5. A reference line shows location of stones in December 1981
(photographed March 4, 1982) ------------------------------- 12
6. Showing initial effect of particle erosion (photographed
February 1, 1983) ------------------------------------------ 13
7. Showing advanced stage of particle erosion (photographed
May 2, 1983) ----------------------------------------------- 13
8, Sketch of typical rip rap failure area in the shape of a horseshoe,
caused by particle erosion -------------------------------------- 15
9-11. Photographs of rip rap on Cosumnes River near Dillard Road Bridge
near Sloughhouse, California (photographed May 31, 1983):
9, At site 2, showing translational slide failure --------------- 17
10. At site 3, looking downstream, showing modified slump
failure ---------------------------------------------------- 17
11, On left bank, at site 1, showing slump failure --------------- 19
12., Photograph of damaged riprap on left bank of Pinole Creek at
Pinole, California, following flood of January 4, 1982
(photographed March 1982) --------------------------------------- 22

IV