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Erosion and Sediment control checklist and calcs · OPW19/0098
Attached to the e-mail Operational Works application OPW19/0098 - Cover Letter - DA Form 1 - Site Plan - Erosion & Sediment Control checklist - Acid Sulfate Report - Civil Plans - 64 Gateway Drive Noosaville -.
EROSION AND SEDIMENT CONTROL CHECKLIST
The following check list relates to the desired outcomes of Table A of Appendix 2 of the
State Planning Policy
Erosion Control
Desired Outcome Comment
1. Stage clearing and As the site earthworks is a balanced cut/fill it is
construction works to not possible to stage the works. Notwithstanding
minimise the area of exposed the Erosion Risk as per ICEA guidelines is low –
soil at any time refer attached RUSLE calculation
2. Effectively cover or stabilise Due to the area involved it is not practical to
exposed soils prior to stabilise all exposed areas during the
predicted rainfall earthworks activity. Dirty water catch drains are
lined to reduce erosion along concentrated flow
paths
3. Prior to completion of the On completion of the bulk earthworks the area
works for the development., will be topsoiled and hydromulched to provide a
and prior to removal of grass cove, or covered with mulch depending on
sediment controls, all expected duration to future building works
surfaces must be effectively
stabilised
Sediment Control
Desired Outcome Comment
1. Direct runoff from exposed As noted above the erosion risk for the bulk
site soils to sediment controls earthworks activity is low. Notwithstanding the
that are appropriate to the lower section of the site will be bunded to
extent of disturbance and provide a sediment trap with a rock lined weir
level of erosion risk outlet. This is considered in excess of minimum
requirements for a low risk site.
2. All Exposed areas greater Clean water diversion drain have been provide
than 2500m2 must be to divert external catchments around the
provided with sediment disturbed areas. Lined dirty water flow paths
controls which are designed, have been provide to direct water to the
implemented and maintained sediment trap. The volume of the sediment trap
to a standard that would exceeds the size determined using the ICEA
achieve at least 80% of the guidelines - refer attached calculations (270m3
average annual runoff required, >450m3 provided)
volume of the contributing
catchment treated.
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T jobno: / BSSG O D ee al = by: GA engineers & project managers calculation sheet date 3). 65.18 project ©4 GATEWAY DRIVE, MCOSANILLE subject EROS (OM HAZARD ASSE-SSMEAIT EROS(OM HAZARD TASK NUMECR HeiTiAl) SS) H = HAZARD RATING <TOCO COOK RISK 72OCO HIaH RISE T = DURATIOA! OF DISTURBANCE (monrHS As AREA OF DISTURBANCE (im) S= swore FACTOR (TABLE F2 -1ECA Aust.) K = Soll EROSIVITY FACTOR (RUSLE K FACTOR) Ts G WEEKS D /. SB MwTHs A = B7SO Ph ig S= 0.23 Gore LENGTH BOm, GRADIENT 1-2/) K = 0.088 D9 ASSUMES Medium PLAST) CIT7 CLAY NE: SOIL VAT ESTED H= 1.38 x 8730 *O-23 x 0.058 = IGl < 200 CLASSED AS LOW RISE , Noosa: 0754499600 Sunshine Coast: 0753293190 Mackay; 07 4840 2337 PO Box 61, Noosaville, QLD 4566, Australia www.todconsulting.com
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T jobno: /(8BSSG OD oe ca = = . bu: GA engineers & project managers calculation sheet date 21s g project! GA GATEWAY DRIVE, NIOOSANILLE subject: RUSLE CALCULATION TOTAL CATCHMENT = 0.8730 ha DISTURBED CATCHMENIT = ©. S730 he ASSUPIEb Soll TEXTURE GROLP = TYPE F R~ RAINFALL EROSINITY (R- FACTOR) K = Soil ERODIBILITY FACTOR. CS = LENGTH GEADIENT FACTOR, C= COVER MANAGEMENT FACTOR. P= CROSIOAA CONTTROU PRACTICE FACTOR A (f ANACAL SOIL LOSS FROM EROSION (E/ha/y-) Az IrRi.jA.| US|). [c | Pp R= 164.74 (1.1177) 5 Stat WHERE S = @ TEAR G HR STORM > IF FoR NOOSAYILLE = /6.G rete her K= 6890 K= 0.0S8 — mediurt PLASTICITY CLAY ASSUMED LS = 0.23 (GLoPe LENGTH 80% cave |-2/-) c= | (wo cover) P= (.3 (comPAcTeD AALD SMOOTH fe ConSTRUCTOY PHASE ) A= GS9Ox 0.0SBx O.7S x! x (-3 =| lz t/ha/ge ESTIMATES soit CoSS pocS NoT ExXcEED [so C/ hed ye (ISCA. APPENDIX & PAGE 8.4) RE COMMERD + CREATION OF BASIA( USING EXCESS SPOIL ~e I~ HIGH BLNB TO NORTHERN BooAMEY WITH WEIR. AT NORTH EAST CORNER . aReST AT IL 4- WS eer. lOn~ UtiBG 4 BOO. pee, Noosa: 07 54499600 Sunshine Coast: 07 53293190 Mackay: 07 4840 2337 PO Box 61, Noosaville, QLD 4566, Australia. www.todconsulting.com
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1. Site Data Sheet
Site Name: Gateway Drive
Site Location: Noosaville
Precinct: 64 Gateway Drive
Description of Site: Preliminary Earthworks
Sub-catchments
Site area Remarks
Basin 1
Total catchment area (ha) 0.873
Disturbed catchment area (ha) 0.873
Soil analysis (enter sediment type if known, or laboratory particle size data)
Sediment Type (C, F or D) if known: F
% sand (fraction 0.02 to 2.00 mm)
% silt (fraction 0.002 to 0.02 mm)
% clay (fraction finer than 0.002 mm)
Dispersion percentage
% of whole soil dispersible
Soil Texture Group F
Rainfall data
Design rainfall depth (days)
Design rainfall depth (percentile)
x-day, y-percentile rainfall event
Rainfall R-factor (if known)
IFD: 2-year, 6-hour storm (if known) 16.6
RUSLE Factors
Rainfall erosivity (R -factor) 6390 6390 6390 6390 6390 6390 Auto-filled from above
Soil erodibility (K -factor) 0.058
Slope length (m) 80
Slope gradient (%) 1.2
Length/gradient (LS -factor) 0.23
Erosion control practice (P -factor) 1.3
Ground cover (C -factor) 1
Calculations
Soil loss (t/ha/yr) 112
Soil Loss Class 1
3
Soil loss (m /ha/yr) 86
Page 5
4. Volume of Sediment Basins, Type D and Type F Soils
Basin volume = settling zone volume + sediment storage zone volume
Settling Zone Volume
The settling zone volume for Type F and Type D soils is calculated to provide capacity to contain all
runoff expected from up to the y-percentile rainfall event. The volume of the basin's settling zone (V) can
be determined as a function of the basin's surface area and depth to allow for particles to settle and can
be determined by the following equation:
V = 10 x Cv x A x Rx-day, y-%ile (m3)
where:
10 = a unit conversion factor
Cv = the volumetric runoff coefficient defined
as that portion of rainfall that runs off as
stormwater over the x-day period
Rx-day, y-%ile = is the x-day total rainfall depth (mm) that
is not exceeded in y percent of rainfall
events. (See Sections 6.3.4(d), (e), (f),
(g) and (h)).
A = total catchment area (ha)
Sediment Storage Zone Volume
In the detailed calculation on Soil Loss Classes 1 to 4 lands, the sediment storage zone can be taken as
50 percent of the settling zone capacity. Alternately designers can design the zone to store the 2-month
soil loss as calculated by the RUSLE (Chapter 6.5.3(d). However, on Soil Loss Classes 5, 6 and 7 lands,
the zone must contain the 2-month soil loss as calculated by the RUSLE (Chapter 6.5.3(d).
Place an "X" in the box below to show the sediment storage zone design parameters used here:
50% of settling zone capacity,
x 2 months soil loss calculated by RUSLE
. Average Depth of basin = 0.25 metres
Total Settling Sediment Total Basin shape
catchment zone storage basin
Site Cv Rx-day, y-%ile
area volume volume volume L:W Length Width
(ha) (m3) (m3) (m3) Ratio (m) (m)
Basin 1 0.54 54 0.873 255 15 270 3 56.9 19.0
0.54 3
0.54 3
0.54 3
3
3
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