O R

FILL
ACK
SLO
PIN G B
RGE *
CHA
190 SUR
R CAPPING BLOCK
ILL O
A CKF
SLO
PING
B
RGE * Y16 IN TOP COURSE
CHA
140 SUR
CAPPING BLOCK

Y12 IN TOP COURSE Y16 AT 400 MINIMUM IN

Y12 AT 400 (VERTICALLY) 55 COVER TO ALL REMAINING COURSES
BARS IN WALL Y12 AT 400 (VERTICALLY)
Y12 AT 400 MINIMUM IN
55 COVER TO ALL REMAINING COURSES FILTER DRAINAGE LAYER
BARS IN WALL (REFER NOTE 13)

H
FILTER DRAINAGE LAYER
(REFER NOTE 13) LAP BARS MIN. 600
Y16 AT 400 (VERTICALLY)
LAP BARS MIN. 450
H

Y12 IN ONE COURSE ABOVE Y16 IN ONE COURSE ABOVE

WEEPHOLES CLEAN-OUT BLOCK WEEPHOLES CLEAN-OUT BLOCK
(REFER NOTE 10) (REFER NOTE 10)
Y12 AT 400 (VERTICALLY)
LONGITUDINAL DRAIN
CLEAN-OUT BLOCK LONGITUDINAL DRAIN CLEAN-OUT BLOCK (REFER NOTE 11)
F72 MESH (REFER NOTE 11) F72 MESH

30 30 NOTES:
200

200
1. THE SPECIFIED DIMENSIONS ASSUME A MINIMUM ALLOWABLE BEARING CAPACITY OF 100 kPa IS
D

AVAILABLE ON SITE. THE DESIGN DOES NOT ACCOMMODATE VEHICLE LOADINGS, HENCE A VEHICLE
Y16 AT 400
50 COVER TO ALL Y12 AT 400 ON THE UPHILL LEVEL SHALL BE NO CLOSER THAN 'H' FROM THE REAR CAPPING EDGE.
Y12 AT 400 BARS IN FOOTING 2. CONCRETE BLOCKS TO BE GRADE 15 (REFER AS4455).
50 COVER TO ALL Y16 AT 400
W
BARS IN FOOTING W 3. MORTAR TO BE GRADE M3. (REFER AS3700)
B 4. CONCRETE FOOTINGS TO BE GRADE N25 (REFER AS1379).
B
5. GROUT TO BE GRADE N20 (REFER AS3700) WITH A SLUMP OF 230±30.

0.8m, 1.0m, 1.2m HIGH 1.4m TO 1.8m HIGH 6.

7.
REINFORCEMENT TO BE GRADE 400Y DEFORMED BARS (REFER AS1302).
A GEOTECHNICAL ASSESMENT BY A SUITABLY QUALIFIED ENGINEER IS REQUIRED FOR ALL WALLS

(150 SERIES BLOCK) (200 SERIES BLOCK) 8.

FOUNDED IN POOR MATERIALS (e.g. BEARING CAPACITY <100kPa).
MORTAR FINS PROTRUDING INTO CORES TO BE REMOVED BEFORE GROUTING.
9. ALL CORES SHALL BE FILLED WITH GROUT, WHETHER REINFORCED OR NOT.
10. INSTALL WEEPHOLES IN ADDITION TO THE LONGITUDINAL DRAIN FOR MAINTENANCE AND
OVERFLOW PURPOSES. WEEPHOLES TO BE A VERTICAL JOINT VOID OF MORTAR ON THE LOWER
HALF OF THE JOINT, SPACED AT 1000 MAX. CENTRES, AND POSITIONED AT A CONSTANT HEIGHT OF
APPROXIMATELY 200 ABOVE ULTIMATE GROUND LEVEL.
11. LONGITUDINAL DRAIN SHALL BE 300x50 MEGAFLOW OR STRIP DRAIN OR 100 DIA CORRUGATED
PERFORATED POLYETHYLENE PIPE, ENCASED WITH BCC TYPE 2 GEOFABRIC (BIDUM A29 OR
EQUIVALENT).THE INVERT OF THE LONGITUDINAL DRAIN SHALL BE 200 BELOW THE INVERT OF THE

FOOTING DIMENSIONS

100
WEEPHOLE INLET. THE LONGITUDINAL DRAIN SHALL OUTLET TO THE KERB AND CHANNEL,
FILTER DRAINAGE LAYER STORMWATER PIPE OR GULLY, AT A MINIMUM SLOPE OF 1 IN 250 AND AT 25m INTERVALS. WHERE
(REFER NOTE 13) SUCH AN OUTLET IS NOT ACHIEVABLE, THE INVERTS OF THE LONGITUDINAL DRAIN AND THE
SLOPE OF BACKFILL UP TO 1 IN 4 WITH NO SURCHARGE OR WEEPHOLE INLET SHALL BE ALIGNED TO ALLOW DIRECT DISCHARGE VIA THE WEEPHOLE.
WALL HEIGHT
"H"
BACKFILL LEVEL WITH 5kPa SURCHARGE * 12. ALL CONNECTIONS, INCLUDING THE JOINING OF LENGTHS OF STRIP DRAIN, SHALL BE MADE USING
STANDARD MANUFACTURERS FITTINGS.
WIDTH "B" DEPTH "D" WIDTH "W"
13. FILTER DRAINAGE LAYER FOR FULL HEIGHT AND LENGTH OF WALL SHALL BE CORDRAIN OR
WEEPHOLES EQUIVALENT WITH BCC TYPE 2 GEOFABRIC (BIDUM A29 OR EQUIVALENT) ADHERED TO ONE SIDE
0 - 800 600 800 700 ABUTTING THE BACKFILL. ALTERNATIVELY, A 300 THICK FREE DRAINING FILTER SAND/GRAVEL
(REFER NOTE 10) LONGITUDINAL DRAIN
801 - 1000 700 300 LAYER SEPARATED FROM THE INSITU MATERIAL BY TYPE 2 GEOFABRIC IS ACCEPTABLE.
500 (REFER NOTE 11)
14. BACKFILL SHALL BE FREE DRAINING, NON-PLASTIC PREDOMINANTLY GRANULAR MATERIAL WITH
1001 - 1200 800 500 300 CLEAN-OUT BLOCK
MINIMUM FRICTION ANGLES OF 38° AND 27° WHERE FOUNDING MATERIALS ARE SAND OR OTHER
MATERIALS RESPECTIVELY. DO NOT PLACE BACKFILL BEHIND THE WALL UNTIL AT LEAST 10 DAYS
300 AFTER WALL CONSTRUCTION AND GROUTING.
1201 - 1400 1000 600
15. ALL COUNCIL RETAINING WALLS TO BE CONSTRUCTED IN THE ROAD RESERVE WHERE POSSIBLE.
1401 - 1600 1100 700 300
PRIVATE WALLS INCLUDING FOOTING TO BE CONTAINED WHOLLY WITHIN PRIVATE PROPERTY.
1601 - 1800 1300 700 300 DRAINAGE DETAIL 16. DIMENSIONS IN MILLIMETRES (UNO).

BRISBANE CITY COUNCIL STANDARD DRAWING

NOT TO SCALE
RETAINING WALL
B Note 7 Updated - Removed 'Building Regulation' Requirement JAN '19 APR '19 APR '19
CONCRETE BLOCK BSD-2223
A Drawing Converted from UMS Series April 2014 APR '14 APR '14 APR '14 BSD-2223 (B) Retaining Wall - Concrete block - Type 2 footing.dwg

SUPERSEDES UMS-413
TYPE 2 FOOTING B