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SUPERSEDED - Compiled Reference Document - RAL25 0011 (As Published)
SEDIMENT AND EROSION
CONTROL DETAILS
GRATE TO BE GEOFABRIC
WRAPPED.
SPACER BLOCK EARTH BUND CONSTRUCTION NOTES
1. BUILD WITH GRADIENTS BETWEEN 1 PERCENT AND 5 PERCENT. OVERLA TRAPPED SEDIMENT
2. AVOID REMOVING TREES AND SHRUBS IF POSSIBLE - WORK AROUND THEM. ND FLO
ROLL OF NETTING FILLED
WITH 50 TO 70mm GRAVEL.
3. ENSURE THE STRUCTURES ARE FREE OF PROJECTIONS OR OTHER IRREGULARITIES THAT COULD IMPEDE W TURF STRIPS
WATER FLOW.
3. BUILD THE DRAINS WITH CIRCULAR, PARABOLIC OR TRAPEZOIDAL CROSS SECTIONS, NOT V SHAPED.
KERB INLET PROTECTION
LINDSAY CONSULTING PTY
4. ENSURE THE BANKS ARE PROPERLY COMPACTED TO PREVENT FAILURE.
LINDSAY CONSULTING PTY LTD
5. COMPLETE PERMANENT OR TEMPORARY STABILISATION WITHIN 10 DAYS OF CONSTRUCTION.
NTS
LTD
DIRECTION OF FLOW
OVERLA TRAPPED SEDIMENT
TYPICAL GRASS FILTER STRIP DETAIL RPEQ 4928
ND FLO
W TURF STRIPS BATTER GRADE N.T.S. OFF. 2C/82 PARKER STREET, MAROOCHYDORE PH 54 792 118
1:2 max.
THIS DRAWING REMAINS THE PROPERTY OF
CHANNEL STABILISATION
AS REQUIRED
NOTE:-
UNDISTURBED
AREA LINDSAY CONSULTING PTY LTD AND IS FOR
Min. GRADE 0.25%
Max. GRADE 0.75%
THE SOLE USE OF THE CLIENT. NO PART
TURF FLARES TO
RESTRICT SCOURING
MUST HAVE A STABILISED OUTLET.
MAYBE USED AS CONTOUR DRAINS MAY BE USED IN PART OR WHOLE WITHOUT
ALONG TURF EDGE
PRIOR EXPRESS WRITTEN CONSENT OF
TURF STRIP
BEHIND KERB CAN BE CONSTRUCTED WITH
LINDSAY CONSULTING PTY LTD
GRADIENT OF DRAIN OR WITHOUT CHANNEL
road surface
1% to 5%
DIRECTION
ALL BATTER GRADES
2(H):1(V) MAX. SURFACE ROUGHENING CLIENT AND PROJECT DESCRIPTION
OF FLOW
150 mm min. 300 mm min.
150 MM MIN. SPILLWAY
150 MM MIN.
EAGLE SURVEYS
GRASSED FILTER STRIPS
NOT TO REGULAR SCALE
2 metres min.
NOTE: ONLY TO BE USED AS TEMPORARY BANK
WHERE MAXIMUM UPSLOPE LENGTH IS 80 METRES.
STORMWATER TREATMENT DETAILS EARTH BUND CUT OFF DRAIN AGGREGATE OR RECYCLED CONCRETE. ROCK TRENCHED 200 MM INTO GROUND PROPOSED SUBDIVISION
SEDIMENT FLOCCULATION
The job of a flocculent is to effectively break down the dominance of the clay particles that contain a residual negative eleCIRCUITro-magnetic charge and thus allowing individual particles
to be drawn together and settle under gravity.
FLO
W 33 CRANK STREET,
METHOD OF APPLICATION
Large sediment basins such as the one this site, require that the gypsum is mixed into a slurry with water and then sprayed over the surface of the turbid water in the sediment
SPACING OF CHECK DAMS ALONG CENTRELINE TEWANTIN
AND SCOUR PROTECTION BELOW EACH CHECK
basin. It is essential that the gypsum is spread evenly over the entire surface for efficient treatment of the turbid water. DAM TO BE SPECIFIED ON SWMP/ESCP
Generally the gypsum should be applied at a rate of about 32 kgm per 100 cubic metres of detained turbid water, as per the adjacent table.
should be calibrated after the first two storm events to assess the actual flocculent application rate and settling time required for the site.
The above dosing rate for the site ROCK CHECK DAM
The final application rate should be sufficiently high to permit adequate sediment sediment flocculation (less than 50 NTU) and basin dewatering within two days (48 hours) from the
conclusion of each storm event, whilst maintaining other required water quality criteria such as pH (6.5 - 8.5) and dissolved oxygen (>80%). ROCK CHECK DAM CONSTRUCTION NOTES
1. CHECK DAMS CAN BE BUILT WITH VARIOUS MATERIALS, INCLUDING ROCKS, LOGS, SANDBAGS AND STRAW BALES. THE
METHOD OF TESTING THE STORMWATER MAINTENANCE PROGRAM SHOULD ENSURE THEIR INTEGRITY IS RETAINED, ESPECIALLY WHERE CONSTRUCTED WITH STRAW
The stormwater detained in the sediment basin will be tested at a suitable location that will be decided upon at the site. The sample should be taken at a location that has adequate
access so no sediment is resuspended while the testing is being conducted.
BALES. IN THE CASE OF BALES, THIS MIGHT REQUIRE THEIR REPLACEMENT EVERY TWO TO FOUR MONTHS.
2. TRENCH THE CHECK DAM 200 MM INTO THE GROUND ACROSS ITS WHOLE WIDTH. WHERE ROCK IS USED, FILL THE DRAWING TITLE
TRENCHES TO AT LEAST 100 MM ABOVE THE GROUND SURFACE TO REDUCE THE RISK OF UNDERCUTTING.
EROSION CONTROL DETAILS
The stormwater detained in the sediment basin will be tested with the TPS 90-FLT water quality logger. The TPS 90-FLT unit samples and records the dissolved oxygen, conductivity,
pH, turbidity and temperature of the stormwater. For further details and specifications on the TPS 90-FLT please refer to Appendix B. 3. NORMALLY, THEIR MAXIMUM HEIGHT SHOULD NOT EXCEED 600 MM ABOVE THE GULLY FLOOR. THE CENTRE SHOULD
If the TPS 90-FLT unit is not present a practical field test that approximates the required 50 NTU level is to fill a clear plastic or glass 65mm diameter soft drink bottle with the ACTING AS A SPILLWAY, BEING AT LEAST 150 MM LOWER THAN THE OUTER EDGES.
water and then hold it up to the light. If seeing clearly through the sample is not possible, then the sample is probably above the 50 NTU level.
4. SPACE THE DAMS SO THE TOE OF THE UPSTREAM DAM IS LEVEL WITH THE SPILLWAY OF THE NEXT DOWNSTREAM
DAM.
METHOD OF DEWATERING
The sediment basin can be dewatered as soon as the water quality criteria met (refer table below). A pump is to be used to decant the basin with a floating inlet to prevent the
settled sediments from being removed from the basin. The pumping must cease prior to the settled sediments being drawn into the intake pipe, it is essential that materials from
the sediment layer are not discharged in the pumping process. STABILISE STOCKPILE
SURFACE
EARTH BANK X.)
E (MA 2:1
P SLO
FLOW SLO PE (
STORMWATER DISCHARGE QUALITY CRITERIA 2:1 MAX
. )
ACCEPTABLE TSS ACCEPTABLE PH DISSOLVED O2 SCALES
50mg/L 6.5 - 8.5 > 80% SEDIMENT FENCE
TOPSOIL STOCKPILE
TOPSOIL STOCKPILE CONSTRUCTION NOTES
SEDIMENT BASIN FLOCCULENT APPLICATION 1. PLACE STOCKPILES MORE THAN 2 (PREFERABLY 5) METRES FROM EXISTING VEGETATION, CONCENTRATED
WATER FLOW, ROADS AND HAZARD AREAS.
AGENT INDICATIVE DOSAGE COMMENTS PRECAUTIONS & CONSTRAINTS MIN. REQD. ON SITE 2. CONSTRUCTION ON THE CONTOUR AS LOW, FLAT, ELONGATED MOUNDS.
3. WHERE THERE IS SUFFICIENT AREA, TOPSOIL STOCKPILES SHALL BE LESS THAN 2 METRES IN HEIGHT.
4. WHERE THEY ARE TO BE IN PLACE FOR MORE THAN 10 DAYS, STABILISE FOLLOWING THE APPROVED
GYPSUM 32kg/100cub.m LITTLE PH CHANGE, SLIGHT INCREASE IN NEEDS TO BE SPREAD EVENLY ACROSS POND. 260 kgm ESCP OR SWMP TO REDUCE THE C-FACIRCUITOR TO LESS THAN 0.10.
SALINITY CAN CAUSE SCUM DEPOSITS IN EQUIPMENT. 5. CONSTRUCTION EARTH BANKS (STANDARD DRAWING 5-5) ON THE UPSLOPE SIDE TO DIVERT WATER AROUND
STOCKPILES AND SEDIMENT FENCES (STANDARD DRAWING 6-8) 1 TO 2 METRES DOWNSLOPE.
NOTE: NOTIFY ENGINEER TO CONFIRM DOSAGES & APPLICATION PRIOR TO USE.
OPEN CONCRETE BLOCKS SEDIMENT AND EROSION
CONTROL DETAILS
ALL EROSION AND SEDIMENT IN ACCORDANCE WITH IN ACCORDANCE WITH UNDISTURBED AREA SURVEY DATUM
WITH MAROON BOOK MANUAL FOR EROSION AND SEDIMENT CONTROL
GRAVEL FILTER
SANDBAG OVERLAP
ONTO KERB 4.0m MIN. .
GEOTEXTILE STAKES
FILTER FABRIC STAKES
DROP INLET 1.5m TIMBER STAKES
RUNOFF WATER WITH GRATE
1.5m M WITH SEDIMENT AT MAX 2.5m CENTRES
RUNOFF
0.2m
DISTURBED
AREA
ASSOCIATED CONSULTANTS
600mm (NOM) GAP
IN.
DIRECTION OF FLOW
BETWEEN SAND BAGS FILTERED GEOTEXTILE
ACT AS SPILLWAY
THREE LAYERS OF
SANDBAGS WITH ENDS
BURIED FABRIC WATER FILTER FABRIC
SEDIMENT FENCE
OVERLAPPED.
DOWN STREAM GULLY PROTECTION DETAILS GEOTEXTILE INLET FILTER STAKES CIRCUITN INTO GROUND W
FLO
NOT TO SCALE GEOTEXTILE INLET FILTER CONSTRUCTION NOTES FL
OW
1. FABRICATE A SEDIMENT BARRIER FROM GEOTEXTILE. GEOTEXTILE FILTER FABRIC
2. FOLLOW DETAIL FOR SEDIMENT FENCE FOR GEOFABRIC
INSTALLATION. REDUCE PICKET SPACINGS TO 1m CENTRES.
BURY THE TOP OF THE PLASTIC 3. DO NOT COVER THE INLET WITH GEOTEXTILE UNLESS THE
IN TRENCH MIN 300mm DEEP. DESIGN IS ADEQUATE TO ALLOW FOR ALL WATERS TO 23
FLOW STAPLE AT 150mm CENTRES. W 24
BYPASS IT. FLO
25
COMPACT SOIL OVER BLANKET
26
PRO A
PER
CENTRELINE SECTION AT POINTS "A" HOLD IN PLACE TY
LINE 90 DEG
WITH SAND BAGS SEDIMENT
FILL TRENCH WITH SOIL TRAP
AND COMPACT nt GEOTEXTILE FILTER SOCK A
lignme FILLED WITH 25MM GRAVEL
OVERLAP-BURY UPPER END OF 15. ty A
LOWER BLANKET AS IN "A". OVERLAP STAPLES: 8 GAUGE MIN 0m Pro
per
END OF TOP BLANKET 300mm AND
STAPLE AT 150 CRS.
(4mm) WIRE Berm (300mm MIN height)
KERB INLET PIT SEDIMENT BARRIER
NOM
SEDIMENT
200
TRAP
FLOW
50m NOTE: POINTS A AT SAME
Geotextile fabric, MAX ELEVATION
Bidum U34 or similar
3.0mN 1.5m TIMBER STAKES
CENTRELINE SECTION AT POINTS "B" Unbound pavement material (gravel) to Grading
B, Table 9 of QT Specification MRS11.05,
MI
c han
nel
oad
way
AT MAX 2.5m CENTRES
SELF-SUPPORTING
GEOTEXTILE SEDIMENT FENCES
b&
exclude material finer than sieve 2.36mm Ker
g, o
r new
r
DIRECTION OF
Sedi
- uncontouredFenceconcentrati
m ent installeond ofacross thed contour
flow shoul be avoided
A Exis
tin 500mm TO 600mm FLOW
NOT TO REGULAR SCALE
Runoff from pad directed to sediment trap 600mm MIN ON SOIL, 150mm x 100mm
TRENCH WITH COMPACTED
BACKFILL AND ON ROCK, SET
B TEMPORARY CONSTRUCTION ENTRY/EXIT SEDIMENT TRAP
Not to Scale
SECTION DETAIL INTO SURFACE CONCRETE
REVISION LIST
STAPLE BLANKETS
CATTLE GRID 3.0m NOM WIDTH
SET 300mm ABOVE GROUND A ORIGINAL ISSUE 21/5/25
AT GRID OF CONSTRUCTION SITE 5
1m CENTRES MIN m T
B MEN
NOM
LIGN
200
A
10 TY
MIN m
R O PER NEL ;SEDIMENT FENCE CONSTRUCTION NOTES
B P N
CHA AY 1. CONSTRUCTION SEDIMENT FENCES AS CLOSE AS
FLOW
GEOFABRIC FABRIC, BIDIM A34 & ADW KERB INLET PIT SEDIMENT BARRIER POSSIBLE TO BEING PARALLEL TO THE CONTOURS OF THE
300
B
STAPLE OUTSIDE EDGES OR SIMILAR m KER EW RO CONSTRUCTION NOTES SITE, BUT WITH SMALL RETURNS. THE CATCHMENT AREA
AT 300mm CRS. 3MIN SHOULD BE SMALL ENOUGH TO LIMIT WATER FLOW IF
RN 1. FABRICATE A SLEEVE FROM GEOTEXTILE OR WIRE MESH
N G ,O LONGER THAN THE LENGTH OF THE INLET PIT AND FILL
CONCENTRATED AT ONE POINT.
RUNOFF TO BE DIRECTED TO A SEDIMENT TRAP, ST I 2. CUT A 150-mm DEEP TRENCH ALONG THE UPSLOPE
EXI
CLEAN/DIRTY DIVERSION DRAINS REFER STANDARD DRAWING D-0041. WITH 25mm TO 50mm GRAVEL.
2. FORM AN ELLIPTICAL CROSS-SECIRCUITION APPROX. 150mm
LINE OF THE FENCE FOR THE BOTTOM OF THE FABRIC TO
BE ENTRENCHED.
TEMPORARY ENTRY/EXIT HIGH, 400mm WIDE.
3. PLACE THE FILTER AT OPENING LEAVING AT LEAST
100mm BETWEEN KERB INLET AND SLEEVE. MAINTAIN
3. CIRCUIT TIMBER STAKES INTO GROUND AT 2.5m
INTERVALS (MAX) AT THE DOWNSLOPE EDGE OF THE TRENCH.
4. FIX SELF-SUPPORTING GEOTEXTILE TO THE UPSLOPE
DIVERSION DRAIN CONSTRUCTION NOTES OPENING WITH SPACER BLOCKS. SIDE OF THE POSTS ENSURING IT GOES TO THE BASE OF
4. FORM A SEAL WITH KERB TO PREVENT SEDIMENT THE TRENCH. FIX THE GEOTEXTILE WITH WIRE RECOMMENDED
1. REMOVE ANY ROCKS, CLODS, STICKS OR GRASS FROM THE SURFACE BEFORE LAYING PLASTIC.
TEMPORARY ENTRY/EXIT CONSTRUCTION NOTES BY THE MANUFACTURER. THE USE OF SHADE CLOTH FOR
BYPASS.
2. ENSURE THAT TOPSOIL IS AT LEAST 75mm DEEP. 5. SANDBAGS FILLED WITH GRAVEL CAN SUBSTITUTE FOR THIS PURPOSE IS NOT SATISFACTORY.
1. STRIP THE TOPSOIL, LEVEL THE SITE AND COMPACT THE SUBGRADE. 5. JOIN SECTIONS OF THE FABRIC AT A SUPPORT POST
3. ENSURE PLASTIC WILL BE CONTINUOUSLY IN CONTACT WITH THE SOIL BY GRADING THE SURFACE 2. COVER THE AREA WITH NEEDLE-PUNCHED GEOTEXTILE. THE MESH OR GEOTEXTILE PROVIDED THEY ARE PLACED
CAREFULLY FIRST. SO THAT THEY FIRMLY ABUT EACH OTHER AND WITH A 150mm OVERLAP.
3. CONSTRUCTION A 200mm THICK PAD OVER THE GEOTEXTILE USING ROAD BASE OR 30mm. 6. BACKFILL THE TRENCH OVER THE BASE OF THE FABRIC
4. LAY FABRIC IN "SHINGLE FASHION", WITH THE END OF EACH UPSTREAM ROLL OVERLAPPING THOSE 4. ENSURE THE STRUCTURE IS AT LEAST 15m LONG OR TO BUILDING ALIGNMENT AND AT SEDIMENT LADEN WATERS CANNOT PASS BETWEEN.
DOWNSTREAM. ENSURE EACH ROLL IS ANCHORED PROPERLY AT ITS UPSLOPE END. AND COMPACT IT THOROUGHLY OVER THE GEOTEXTILE.
LEAST 3m WIDE. Computer File
5. ENSURE FULL WIDTH OF FLOW CHANNEL IS COVERED BY THE PLASTIC. 5. WHERE SEDIMENT FENCE JOINS ONTO THE STABILISED ACCESS, CONSTRUCTION A HUMP OR
GRATE IN THE STABILISED ACCESS TO DIVERT WATER TO THE SEDIMENT FENCE. 250314OPW.DWG
DRAWING NUMBER SHEET REV.
25-0314-C5 5 A
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