23 CA ADC § 121
23 CCR s 121
Cal. Admin. Code tit. 23, s 121
CALIFORNIA CODE OF REGULATIONS
TITLE 23. WATERS
DIVISION 1. RECLAMATION BOARD
CHAPTER 1. ORGANIZATION, POWERS AND STANDARDS
ARTICLE 8. STANDARDS
This database is current through 05/19/06, Register 2006, No. 20.
s 121. Erosion Control.
(a) Quarry stone, cobblestone, or their equivalent may be used for erosion
control along rivers and streams if the material meets the criteria below.
Typical sections delineating methods of placement and dimensions of
revetment using rock and sacked concrete are shown in Figures 8.02 and
8.03.
(1) Bedding materials must be placed under the stone protection at
locations where the underlying soils require such material for
stabilization, considering such factors as tidal fluctuation, wave action,
and streamflow velocity.
(2) Cobblestone protection must be placed on prepared slopes of three (3)
feet horizontal to one (1) foot vertical or flatter.
(3) Cobblestone protection, having acceptable cobblestone gradations, may
be used where streamflow velocities ten (10) feet from the bank do not
exceed eight (8) feet per second.
(4) Quarry stone protection must be placed on prepared slopes steeper than
three (3) feet horizontal to one (1) foot vertical.
(5) Quarry stone protection, meeting required gradations and sizes, may be
used at locations where streamflow velocities ten (10) feet from the bank
do not exceed twelve (12) feet per second.
(6) Required gradations of cobblestone and quarry stone are as follows:
Cobblestone Quarry stone
Stone Percent Stone Percent
Size Passing Size Passing
15 " 100 15 " 100
10 " 55 to 95 8 " 80 to 95
8 " 35 to 65 6 " 45 to 80
6 " 10 to 35 4 " 15 to 45
3 " 1 to 5 2 " 0 to 15
(7) Graded cobblestone and quarry stone must be placed in a manner which
avoids segregation.
(8) Where streamflow velocities ten (10) feet from the bank exceed twelve
(12) feet per second, special cobble or quarry stone gradation is
required. Flow retarding structures, such as retards, wing dams, and rock
groins may be permitted at these high streamflow velocity sites.
(9) Alternative bank protection materials may be permitted by the board.
Possible alternatives include but are not limited to: sacked concrete;
broken concrete free of projecting steel; reinforced concrete; precast
concrete cribbing; and stone-filled gabion baskets.
(10) Broken concrete used for levee revetment may be no larger than
sixteen (16) inches at its maximum dimension.
(11) Asphalt or other petroleum-based products may not be used as fill or
as erosion control on a levee section or within a floodway.
(12) The minimum thickness of revetment is eighteen (18) inches
perpendicular to the bank or levee slope below the usual water surface and
twelve (12) inches above the usual surface.
(13) Revetment must be uniformly placed and properly transitioned into the
bank, levee slope or adjacent revetment.
(b) When revetment is proposed by an applicant but not required by the
board, the standards relating to revetment bedding, gradation, size, shape
and thickness are recommended but not required.
Image 1 (8.5" X 6.75") Not available for Offline Print to STP or FAX
Image 2 (8.5" X 6.5") Not available for Offline Print to STP or FAX
Note: Authority cited: Section 8571, Water Code. Reference: Sections 8608,
8609 and 8710, Water Code.
HISTORY
1. New section and figures 8.02 and 8.03 filed 9-30-96; operative 10-30-96
(Register 96, No. 40).
23 CA ADC s 121
END OF DOCUMENT
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