N13078 - 2014.10.17 - 2 Of 2

 

Fu

Cl. CAP. EXTEND CAP TO

APPROX. 100mm ABOVE
BIO-RETENTION SURFACE.

SCREW CAP FIXED USING 3 SCREWS

EXTEND LINER 300mm UNDER

 

FILTER MEDIA, DEPTH VARIES - SANDY LOAM
CONSISTENT WITH CURRENT FAWB SPECIFICATIONS.

TRANSITION LAYER - DEPTH 100mm E
COARSE SAND - NOMINAL PARTICLE SIZE 1mm
150mm x 150mm CONCRETE
SURROUND TO CLEANOUT RISER LINER TO EXTEND 300mm INTO MEDIA
AND BE FIXED TO PERIMETER OF PIT

]
STORMWATER QUALITY W.S.L

 

 

0.30m

 

 

TOPSOIL AND PIN TO EMBANKMENT ——"—J JOT |
SUBSOIL DRAIN CLEANOUT - PVC PIPE (NON |_0.50m
SLOTTED) AND CONNECTOR CLEANOUTS AT 2 MING
HEAD OF SUBSOIL DRAIN AS SHOWN ON PLAN ‘

 

 

 

 
      

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TYPE 1 FIELD INLET
1 cuRFACE LEVEL, INVERT LEVEL,
| AND SIZE AS SPECIFIED.

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GRAVEL DRAINAGE LAYER - DEPTH

50mm

 

VARIES (200mm MIN) TO SUIT GRADE OF
SUBSOIL PIPES. 2-4mm AGGREGATE NO FINES

UPVC JOINT TO
CONNECTION RISER
TO SLOTTED PIPE

 

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PROVIDE BIDUM AIZOR_ NSCS SR

 

 
   

 

 

 

 

 

 

 

 

 

 

 

HDPE LINER - REFER NOTE — || \
150% SMOOTH WALLED SLOTTED 225 UNSLOTTED PVC OUTLET PIPE -
PVC PIPE - MIN 0.5% GRADE COLLECTOR PIPE - MIN 0.5% GRADE SIZE AS SPECIFIED

AND MAX 2.5m SPACINGS

TYPICAL BIO RETENTION BASIN SUBSOIL DRAIN

 

CLEAN OUT AND FILTER MEDIA SPECIFICATIONS

 

ROCK ARMOURING NOTES:

1. ROCKS TO BE DURABLE BLUE STONE OR OTHERWISE
APPROVED BY SUPERINTENDENT.

2. EACH ROCK SHALL BE:

- ANGULAR IN SHAPE (PROMOTES INTERLOCKING)
- FREE FROM OVERBURDEN, SPOIL, SHALE AND
ORGANIC MATERIAL.

3. NEITHER BREADTH NOR THICKNESS OF A SINGLE ROCK
SHALL BE LESS THAN ONE HALF ITS LENGTH (ie THE
ROCK SHALL BE CHUNKY RATHER THAN FLAT).

4. ROCKS TO BE PLACED AND INTERLOCKED INTO
POSITION AND BUILT UP TO FINAL LEVELS SHOWN,
ENSURING COVERAGE OF GEOFABRIC.

5. GAPS BETWEEN THE ROCKS ARE 7O BE FILLED BY
DROPPING SMALL ROCKS INTO GAPS AND LOCKING
INTO POSITION WITH A CROWBAR.

6. ALL ROCKWORK TO BE PLACED OVER BIDIM A24 OR
EQUIVALENT.

7. FOR ROCK SIZED SPECIFIED AS Dso ON THE DRAWINGS,

THIS CORRESPONDS TO THE MEDIAN DIAMETER OF
WHICH HALF OF THE ROCK SIZES SHALL BE GREATER
AND HALF OF THEM SHALL BE SMALLER. THE ROCK
SHALL BE WELL GRADED AND HAVE A MAXIMUM SIZE
NO GREATER THAN 30% AND A MINIMUM SIZE NO
LESS THAN 30% SMALLER THAN Dso. FOR EXAMPLE
IF Dso = 400mm IS SPECIFIED, THE EQUIVALENT ROCK
DIAMETER RANGES FROM 280 to 520mm.

 

NOTE:

APPROPRIATENESS OF GEOTEXTILE LINER AS
AN ALTERNATIVE TO HDPE LINER TO BE
ASSESSED BY GEOTECHNICAL ENGINEER AT
CONSTRUCTION STAGE FOLLOWING TESTING OF
INSITU SOILS.

 

 

 

 

NOTES:

1, REFER DRAWING N13078-128 TO N13078-130
FOR BASIN SECTIONS AND DETAILS.

2. REFER DRAWING N13078-107 TO N13078-109
FOR EARTHWORKS NOTES AND DETAILS.

 

 

 

E, N13078-1B1.dwq DATE: 16-10-2004 TIME; 1539

xref's: X-NBBOI8-TIT USR; Curtis Boorman

SCALE 1:20 (A1)

BIO RETENTION INSTALLATION NOTES:
THE PLACEMENT OF DRAINAGE, TRANSITION AND FILTER PROVIDE 300mm

MEDIA LAYERS MUST BE UNDERTAKEN CAREFULLY TO THICK CONCRETE INFILL
ENSURE CORRECT DEPTH, SLOPE AND COMPACTION

DEPTH: FILTER MEDIA SHOULD BE INSTALLED AND
COMPACTED IN TWO LIFTS FOR DEPTHS OVER 500mm.
SLOPE: THE TOP SURFACE OF THE DRAINAGE LAYER,
TRANSITION LAYER AND FILTER MEDIA LAYER SHOULD BE
FLAT. A SPREADER BAR SHOULD LEVEL THE SURFACE OF

  

1.0m WIDE, 0.45m DEEP, 0.20m

 

EACH LAYER. THICK CONCRETE (SL81 MESH
COMPACTION: THE FILTER MEDIA MUST BE LIGHTLY CENTRAL) SUPPORT UNDER PIPE
COMPACTED DURING INSTALLATION TO PREVENT THE

MIGRATION OF FINE PARTICLES. THIS CAN BE ACHIEVED

WITH A SINGLE PASS OF A LIGHT ROLLER SUCH AS A TYPICAL OUTLET THROUGH ROCKWALL DETAIL

DRUM LAWN ROLLER. A VIBRATING PLATE CAN ALSO BE SCALE 1:50 (A1)

USED TO COMPACT SMALL BIO RETENTION SYSTEMS OR
"POZITRACK’ BOBCATS CAN BE USED FOR LARGE SYSTEMS.
ENSURE ONLY ONE COMPACTING PASS IS MADE OVER THE
MEDIA FOR LIGHT COMPACTION.

BIO RETENTION BASIN CONSTRUCTION SEQUENCE NOTES:

THE CONSTRUCTION AND ESTABLISHMENT OF BIO RETENTION BASINS IS TO BE STAGED AS FOLLOWS:

1. FUNCTIONAL INSTALLATION - ONCE THE MAJORITY OF THE SUBDIVISION WORKS ARE COMPLETE, THE
BASIN CONSTRUCTION INCLUDING EARTHWORKS, INLETS, OUTLET STRUCTURES, SUBSOIL DRAINAGE,
TRANSITION LAYERS, FILTER MATERIAL, PROTECTIVE LAYERS AND EROSION AND SEDIMENT CONTROL
MEASURES ARE TO BE UNDERTAKEN BY THE CIVIL CONTRACTOR. THE FILTER MEDIA WITHIN THE BIO
RETENTION BASIN IS TO BE COVERED WITH A PROTECTIVE GEOFABRIC LAYER (BIDIM A12 OR
EQUIVALENT), THEN COVERED WITH 75mm OF TOPSOIL AND TURFED OR GRASS SEEDED TO THE
SATISFACTION OF COUNCIL. SILT FENCES ARE TO BE ERECTED AROUND THE OUTSIDE OF THE BASIN.
ACCEPTANCE OF THE COMPLETED SUBDIVISION WORKS ON AND OFF MAINTENANCE BY COUNCIL IS TO
EXCLUDE THE PROTECTIVE LAYERS WITHIN THE BIO BASINS.

2. BUILDING CONSTRUCTION - THE PROTECTIVE GEOFABRIC AND GRASS LAYER AND THE EROSION AND
SEDIMENT CONTROL MEASURES ARE TO REMAIN IN PLACE DURING THE BUILDING CONSTRUCTION PHASE.
THE BUILDING CONSTRUCTION PHASE IS TO BE THE TIME FOR COMPLETION OF 90% OF THE BUILDING
CONSTRUCTION AND SITE ESTABLISHMENT WORKS ON ALLOTMENTS OR 12 MONTHS FOLLOWING
COMPLETION OF THE SUBDIVISION WORKS, WHICHEVER IS SHORTER. THE MAINTENANCE OF THE BASINS
INCLUDING INLETS, OUTLETS AND EROSION AND SEDIMENT CONTROL MEASURES IS TO BE UNDERTAKEN
BY THE CIVIL CONTRACTOR FOR THE DURATION OF THE BUILDING CONSTRUCTION PHASE.

3. OPERATIONAL ESTABLISHMENT - FOLLOWING COMPLETION OF THE BUILDING CONSTRUCTION PHASE, THE
TURF, TOPSOIL AND PROTECTIVE GEOFABRIC IS TO BE REMOVED AND THE BASIN RE-PLANTED WITH
VEGETATION AND LANDSCAPING AS PER THE LANDSCAPE DESIGN DRAWINGS. WORKS UNDERTAKEN FOR
OPERATIONAL ESTABLISHMENT ARE TO BE UNDERTAKEN BY OTHERS AND WILL BE SUBJECT TO A
SEPARATE ACCEPTANCE BY COUNCIL FOR ON AND OFF MAINTENANCE.

4, IN-SITU_INFILTRATION TEST - AN IN-SITU INFILTRATION TEST WILL BE REQUIRED PRIOR TO
ON-MAINTENANCE BEING GRANTED BY COUNCIL. THE TEST WILL NEED TO ACHIEVE AN AVERAGE RATE
OF 180mm/h INFILTRATION (WITHIN APPROPRIATE TOLERANCES) WITH AT LEAST & SAMPLE LOCATIONS
AROUND THE BASIN. ANOTHER IN-SITU INFILTRATION TEST WILL BE REQUIRED FOR OFF-MAINTENANCE.

BIO RETENTION PARTICLE SIZE DISTRIBUTION AND PROPERTIES GUIDE:
SOURCE: (BIOFILTRATION MEDIA GUIDELINES (VERSION 3.01), PREPARED BY THE FACILITY FOR ADVANCING
WATER BIOFILTRATION (FAWB), JUNE 2009.) & (BIO-RETENTION TECHNICAL DESIGN GUIDELINES (VERSION 1)
PREPARED BY ‘WATER BY DESIGN’ (OCTOBER 2012)

 

MATERIAL COMPOSITION RANGE GUIDE:

CLAY AND SILT <3% (<0.05mm)
VERY FINE SAND 5-30% (0.05-0.15mm)
FINE SAND 10-30% (0.15-0.25mm)
MEDIUM TO COARSE SAND 40-60% (0.25-1.0mm)
COARSE SAND 71-10% (1.0-2.0mm)
FINE SAND <3.0% (2.0-3.4mm)

WHILE TOTAL CLAY AND SILT CONTENT OF 3% IS RECOMMENDED, A CLAY AND SILT CONTENT UP TO 6%
IS ACCEPTABLE PROVIDED:

© THE SATURATED HYDRAULIC CONDUCTIVITY IS BETWEEN 100mm/hr & 300mm/hr AND

© THE REMAINING MATERIAL MEETS THE COMPOSITION RANGE SPECIFIED ABOVE.

SOIL SPECIFICATIONS:

© TOTAL NITROGEN CONTENT - <1000mg/kg

© ORTHOPHOSPHATE CONTENT - <80mg/kg SOILS WITH TOTAL PHOSPHORUS CONCENTRATIONS >100mg/kg
SHOULD BE TESTED FOR POTENTIAL LEACHING. WHERE PLANTS WITH MODERATE PHOSPHORUS
SENSITIVITY ARE TO BE USED, TOTAL PHOSPHORUS CONCENTRATIONS SHOULD BE <20mg/kg)

© ORGANIC MATTER CONTENT - AT LEAST 3% (w/w). AN ORGANIC CONTENT LOWER THAN 3% IS
LIKELY TO HAVE TOO LOW A WATER HOLDING CAPACITY TO SUPPORT HEALTHY PLANT GROWTH. IN
ORDER TO COMPLY WITH BOTH THIS AND THE TOTAL NITROGEN AND ORTHOPHOSPHATE CONTENT
REQUIREMENTS, A LOW NUTRIENT ORGANIC MATTER WILL BE REQUIRED.

© pH - AS SPECIFIED FOR ‘NATURAL SOILS AND SOIL BLENDS’ 5.5-7.5 (pH 1:5 IN WATER)

© ELECTRICAL CONDUCTIVITY - AS SPECIFIED FOR ‘NATURAL SQILS AND SOIL BLENDS’ <1.2 dS/m.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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