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Response to Information Request · OPW11/0177
Our Reference: S3000/L5&6/RF TATE PROFESSIONAL ENGINEERS PTY LTD ITATE
ASN 28 088 262 035
39.45 FIRST AVENUE, MOOLOOLABA QLD 4557
P.O. BOX 1092, MOOLOOLABA QLD 4557 CIVIL ENGINEERING
PHONE (07) 5457 5.104) I AX (0,) 5477 4,100 STRUCTURAL ENGINEERING
4th July 2011 WEB www.tate.net.au EMAIL [email protected] PROJECT MANAGEMENT
CRC
Sunshine Coast Regional Council
B0394469
PO Box 141
TEWANTIN QLD 4565
Attention: Mr Mark Lewis
Dear Sir
RE: LOT 5, 10 SERENITY CLOSE, NOOSA HEADS
DEVELOPMENT PERMIT FOR OPERATIONAL WORKS
(ENGINEERING WORKS - ROADWORKS, DRAINAGE WORKS, STORMWATER
AND WATER AND SEWERAGE INFRASTRUCTURE)
COUNCIL REF: OPW11/0177
We are in receipt of Council's Information Request dated 28th June 2011 and offer the following by
way of response:-
1. Please provide RPEQ certification of all plans provided to demonstrate compliance
with all elements of Condition 48 of M0005/0699. A plan detailing the connection of
the irrigation system to the rainwater tank is required.
Drawing D01 provided notes "40,000L minimum rainwater harvesting tank plumbed to irrigation
system". Irrigation systems and other plumbing works are beyond the scope of this Operational
Works application and hence details of such are not included at this time but will be addressed in
future hydraulic consultant's applications as appropriate.
We hereby certify that plans provided demonstrate compliance with Condition 48.
2. Provide calculations to demonstrate that swales are appropriately sized pursuant to
Condition 51 of 132005.699.05.
Typical swale 2 as detailed on Drawing D03D is proposed for conveyance of any overland flows
to RIP's.
Examining the largest catchment to be conveyed (CA2) we note the following:-
Catchment CA2
Impervious Area = 526m2
Roof Area = 205m2
Total Area = 1891 m
Roof areas are conveyed to RIP's underground and hence a catchment area of 1891 - 205 =
1686m2 remains of this catchment.
526/1686 = 31 % is impervious.
S3000/111L5/Response to Information Request - Sunshine Coast Regional Council G LtJ I 0- I T
SHlcw f
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TATE PROFESSIONAL ENGINEERS PTY LTD
ABN 28 086 262 035
Rational Method
For a 1 year ARI storm in Noosa:
51, = 128mm / hr
60ho = 72m/hr
From Table 4.05.3(a) of QUDM:
C,o = 0.76
FY = 0.80
5Qr = 0.76 x 0.80 x 128mm If hr x 1686m2
= 0.036m3 / sec
Swale Capacity - Mannings
For Swale 2 flowing full:
A =0.3x1.0=0.3m2
P = 2 x 0.3 + 1.0 = 1.6m
R = A/P = 0.188m
n = 0.04 (medium grass)
s = 0.005
V = R213 S12/n=0.188213x0.0051 /2/0.04
= 0.58m / sec
Q = V.A = 0.58m / sec x 0.3m2
= 0.174m3 / sec >>5Q,
This proposed Swale 2 is adequate to convey 1 year ARI flows and hence 3 month ARI flows.
3. Demonstrate that there will not be an increase in runoff in events that exceed the
design capacity of the swales. Appropriate detention must be demonstrated where
required.
All rainwater incident on the proposed development, up to 100 year ARI events is to be infiltrated
on site via Rapid Infiltration Pits as demonstrated in the application. As such there will be no
runoff from the site for events up to 100 year ARI and no increase in runoff from the site for
events up to 100 year ARI, satisfying the requirements of QUDM and Condition 49.
4. Revise surface treatment proposed for swales so that it is low maintenance and likely
to maintain its modeled configuration during the long term and consistent with the
-- -requirements of -the approvedmanagement plans---
Drawings have been revised to remove reference to turf in swales (despite its successful use on
previous adjacent stages). We defer to the landscape architect for details of Swale planting.
S3000/11/L5/Response to Information Request - Sunshine Coast Regional Council
SH/cw
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TATE PROFESSIONAL ENGINEERS PTY LTD
ABN 28 086 262 035
5. Detail the RL of the overflow of the underground rainwater tanks and inlet to the Rapid
Infiltration Pits on the submitted drawings.
We note that proposed rainwater harvesting tanks as indicated on drawing D01 C occur above
proposed ground floor level of RL21.5m AHD and the tops of the proposed RIP's are to be at
RL18.45m AHD.
As such there will be no shortage of fall or gradient required to achieve adequate overflow of
tanks to the RIP's.
Building drainage, guttering, spouting, etc is beyond the scope of this Operational Works
application and hence details of such are not included at this time but will be addressed in future
hydraulic consultant's applications as appropriate.
6. Provide in situ hydro conductivity testing to confirm that the assumptions made on soil
permeability and infiltration rate of the insitu soils are accurate.
Infiltration rates applied to the RIP analysis spreadsheet are derived from in-situ prototype testing
carried out by Tate Professional Engineers (refer Appendix B of Stormwater Management Plan)
with a factor of safety of two (2) applied. Such results have been accepted for all previous
Operational Works applications and the higher order MCU approval and management plans
controlling development of the entire Settlers Cove site.
7. Demonstrate that scour along the downstream batter / weir of the turfed swale along
the rear boundary will not occur in a major storm event.
Rapid Infiltration Pits proposed along the site's northern frontage have been designed to infiltrate
stormwater runoff for events up to 100 year ARI without overtopping and with a factor of safety of
two (2) applied.
In addition to this a swale around 60m long x 2m wide and with a depth of 0.35m is proposed
above surcharge levels of the RIP's to contain and further infiltrate runoff from storms of "biblical
proportions".
By adopting a level Swale along the full length any discharge from the Swale during such
incredibly unlikely storm events would be dispersed along the full length of the swale so as not to
cause scour of the escarpment.
As such Condition 22 of the MCU decision notice is satisfied.
Weru7 this adequately addresses all issues raised and look forward to receipt of a decision notice.
Yours faithfully
Sted.HHarrison - Director
for AMTE. PROFESSIONAL ENGINEERS PTY LTD
Encl/ Dwg S3000/08/L5-6/D03D
Cc: Mr Gary Godfrey
S3000/111L5/Response to Information Request - Sunshine Coast Regional Council
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TATE PROFFESIONAL ENGINEERS PTY LTD
A.B.N. 28 086 262 035
39-45 First Avenue,
P.O. Box 1092, MOOLOOLABA, 4557
Ph. (07) 5457 5300 Fax (07) 5477 6100
PROFESSIONAL ENGINEERS
Web: http://www.tate.net.au
Email: [email protected]
PROJECT: PROPOSED DEVELOPMENT JOB No. S3000/L5-L6
CLIENT: CAPE BOUVARD DEVELOPMENTS PTY LTD PAGE No. 1
DATE OF DD 291 01 20 051 251 051
ISSUE MM 05 09 10 04 05 07
YY 08 08 08 11 11 11
DOCUMENT TITLE DOC No. REVISION
OW BALL I AYOUT PLAN & DRAWING SCHEDULE S3000/08/L5-6/L01 - A B
ROSION & SEDIMENT & EARTHWORKS PLAN & NOTES S3000/08/L5-6/ES1 - - A B
AR I HWORKS TYPICAL. SECTIONS S3000108/L5-6/ES2 - - A 8
ROSION & SEDIMENT CONTROL DETAILS S3000/08/L5-6/ES3 - A B
DRIVEWAY LAYOUT PLAN & NOTES S3000i08115-6/R01 - - A B
DRIVE WAY DE TAII S & NOTES S3000i08/L5-6/R02 A B
DRAINAGE PLAN & NOTES 530001A8/I S-E1D01 - A B C
DRAINAGE DETAILS S3000i08/L5-6/DC2 A B
RAINWATER HARVESTING TANK DETAILS S3000/08/L5-6/O03 A B C D
STORMWATER CATCHMENT PLAN S3000/08/L5-6/004 A
DISTRIBUTION REGISTER CO PIES / R EASON FO R ISSUE
SUNSHINE COAST REGIONAL COUNCIL (NOOSA) 3/#A 4A# 2#A 3#A 3#A
CAPE BOUVARD (GARY GODFREY) 11#X 1A# 1#X 1#X 1#X
A - Approval B - Budding Approval C - For Construction P - Preliminary e - Electronic Copy
R - Revis,on T - For Tender X - Information # - Denotes A3
IP'aC M --^ai Page 1 1 Form No F- *1
Page 8
LEVEL 1 RL 21.00
HABITAT PROTECTION FENCE TO BE ERECTED
PRIOR TO COMMENCEMENT OF CLEARING
WORKS PROVIDE SIGNAGE AT 50M SPACINGS'
VEGETATED SWALE TO LANDSCAPE ARCHITECTS SPECS ECOLOGICAL RESTORATION AREA . NO ACCESS
1 Or MIN 2 Cm MIN 1 Om MIN VARIES -
SWALE
COMPACTED
SAND BACKFILL.
RL1885 100-3000 NOM ROCK
1 Om
MIN
RL 18.45
TURF BATTERS & BASE.
BASEMENT RI 1800
PLANTING THROUGH GEOFABRIC
TO LANDSCAPE ARCHITECTS
SPEC.
GRADE TO OUTLET @ 1200
MINIMUM
2050 DIE' SLOTTED uPVC
BALANCE PIPES LAID FLAT
TYPICAL SWALE I DETAIL 4 Y ^ ► TYPICAL SWALE 2 DETAIL
SCALE 1 20 (A1) DOl SCALE 1 20(A1)
SWALE 3 SIMILAR SWALE 4 SIMILAR
NOTE:plYORAWQIG5Vft fl RLONSTRIICTIOI BEARI GN10PofNALSIGNATURE9WLBE11SEOFOR PURPOSES Design:, S^, PROJECT DRAWINGnTLE
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Page 9
LEVEL 1RL2100
HABITAT PROTECTION FENCE TO BE ERECTED
PRIOR TO COMMENCEMENT OF CLEARING
WORKS PROVIDE SIGNAGE AT 50M SPACINGS'
VEGETATED SWALE TO LANDSCAPE ARCHITECTS SPECS ECOLOGICAL RESTORATION AREA - NO ACCESS
2 Dm MIN 10m MIN VARIES
SCALE
COMPACTED
SAND BACKFILL
RL1880 100.3000 NOM ROCK
Man
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Z. PLANTING THROUGH GEOFABRIC
E! BIDIM A14 GEOFABRIC TO LANDSCAPE ARCHITECTS
SPEC
GRADE TO OUTLET @ 1:200
MINIMUM
2x150 DIA SLOTTED uPVC
BALANCE PIPES LAID FLAT
TYPICAL SWALE I DETAIL A^ TYPICAL SWALE 2 DETAIL
SCALE 1 20 (A1) SCALE 1 201A1)
SWALE 3 SIMILAR SWALE 4 SIMILAR
NOTE ONLY DRAWINGS kORKEDT-ORCONSTRUCTION' ANDBEARING ANORIGI4ALSIGNITURFSHALL USED FORC NPURPOSES Design: PROJECT DRAWINOTGE
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Page 10
I EVEL 1 RL 2100
HABITAT PROTECTION FENCE TO BE ERECTED
PRIOR TO COMMENCEMENT OF CLEARING
WORKS PROVIDE SIGNAGE AT 50m SPACINGS'
VEGETATED SWALE TO LANDSCAPE ARCHITECTS SPECS. ECOLOGICAL RESTORATION AREA - NO ACCESS
I Om MIN 2 Gm MIN VARIES
SWALE
COMPACTED
SAND BACKFIIA
100-3000 NOM ROCK
1.Om
MIN
TURF BATTERS & BASE
BASEMENT RL 18 CC
PLANTING THROUGH GEOFABRIC
BIDIM A14 GEOFABRIC TO LANDSCAPE ARCHITECTS
SPEC
GRADE TO OUTLET @ 1200
MINIMUM.
2x150 DIA SLOTTED uPVC
BALANCE PIPES LAID FLAT
TYPICAL SWALE I DETAIL TYPICAL SWALE 2 DETAIL
S^%•,t 1 20(A1) SCALE I 20(A1)
SWALE 3 SIMILAR SWALE 4 SIMILAR
NOTE: ONLYDRAMNGSMBXEJ'FORCONSTRL'CTIOIf,+"DNEARNGANORGiNJSKYUPJAESHALLBEUSED FOR CONSTfXT)pN PU OSES Design: Sn PROJECT DRA'AINGTITLE
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