Council archive · source document
Further information re Request to Change Approval MCU 132003.221132.8
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PR1 001 03-14.1 009SD.sd
Our Ref:
Date: 19th April 2013 <=10.3)
J_
Attn: Chief Executive Officer
Sunshine Coast Regional Council
Locked Bag 72
SCMC QLD 4560
Attn: \Senior Development Planne[ -
Denis Wallace 1
Via: Mail
Dear Sir,
RE: PROVISION OF FURTHER INFORMATION -
REQUEST TO CHANGE AN EXISTING
DEVELOPMENT APPROVAL PURSUANT TO SECTIONS 369 AND 370 OF THE
SUSTAINABLE PLANNING ACT 2009 - 2003/221132 (FORMERLY 23616 DA) -
BECKMANS ROAD, NOOSAVILLE: STOCKLAND LAKE DOONELLA PTY LTD
We act on behalf of Stockland Lake Doonella Pty Ltd, regarding the abovementioned request to
change an existing approval lodged on 26th June 2012.
This request to change an existing approval is in relation to a Development Approval for the following
aspects of development-
. Material Change of Use for 181 Dwellings Houses, Group Housing Development of 43 Dwelling
Units and Estate Sales Office; and
. Lot Reconfiguration fro 185 residential lots and 43 Group Title Lots.
Since lodgement of the request to change the abovementioned Development Approval, extensive
negotiations with the Sunshine Coast Regional Council have been held in relation to the matter of
stormwater management and the provision of a link road connecting Doonella Noosa to the adjoining
Beckmans Green estate (’link road’) as part of Stage C of Doonella Noosa.
As a consequence of those discussions, and in consultation with Council, there has been significant
hydrological analysis undertaken, culminating in the provision of an options package to Council by
email dated 15 March 2013 (refer attached options package). The options package provided to
Council highlighted three possible stormwater solutions that had been the subject of investigation for
Stage C of Doonella Noosa, and which were the subject of discussion at an earlier meeting held with
Council on 20 February 2013. The clear preference nominated in the options package was ’Option 3’.
In email correspondence dated 20 March 2013 from Senior Development Planner -
Denis Wallace,
we were advised as follows:-
Of tl1e SWM options you’ve submitted, only Option 3 was presented as viable and doesn’t
and
appear to provide significant benefits over the original proposal in regard to soil hydrology
impacts on existing vegetation. On this basis, council would be willing to amend the
approval(s) to allow for the originally proposed Dodonaea detention area, provided we can
also do the following:
England I Wales I Scotland I Northern Ireland I Ireland I Netherlands I USA I Australia
RPS Australia East Pty Ltd ABN 44 140292 762 A member of the RPS Group Pic
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Section 2
Allow for fauna passage, including a fauna underpass;
Rehabilitate the fauna corridor area post construction in relation to the construction
disturbances and the changes to the soil hydrology and vegetation that will result
from the detention area;
Obtain an Op Works revegetation /rehabilitation approval for the above.
As a consequence of the above advices, further investigations into the designs of the various basins
associated with ’Option 3’ were undertaken, and in doing so, an alternate location for the proposed
Twigrush basin was proposed (refer attached sketch) affecting the alignment of the ’link road’. This
sketch was provided to Council on 27 March 2013 seeking confirmation that Council had no
fundamental concern with the proposal, wherein we were subsequently advised by Senior
Development Planner Denis Wallace (by email dated 3 April 2013):-
-
I confirm that we’ve no fundamental concern with the Twigrush basin proposal. Mark Lewis draws
your attention to the following:
. You need to ensure that the proposed T-intersection beside the basin is suitable for the
intended use (local traffic and bus route) and that the required geometry/sight lines are
achievable.
. It would desirable in any rearrangement of the lots that sufficient space is left for
pedestrian paths and for maintenance access to the basins. Maintenance for the
relocated basin should be from the lower order streets not the link road.
Based on the above, Brown Consulting (QLD)Pty Ltd have completed a review of the Stormwater
Management Plan solution for Stage C of Doonella Noosa, which achieves the fundamentally agreed
outcomes of both Council and Stockland Lake Doonella Pty Ltd (refer attached Updated Management
Strategy). Please note, the Updated Management Strategy has been prepared in addition to the
following previously provided documents:-
. Flood Investigation & Stormwater Management Plan (Report No. B09182.w-02A dated October
2011) prepared by Brown Consulting (QLD)Pty Ltd (provided with original request for a pre-
request response); and
. Letter from BMT WBM (formerly WBM Oceanics) summansmg revised Stormwater Quality
expectations dated 6 Jun 2012 (provided with original request for a pre-request response -
refer
attached); and
. Doonella Noosa Stormwater and Water Quality Management Plan Final Report Addendum
(Report No. R.B15573.002.99 dated July 2012) prepared by BMT WBM (provided via email dated
27 July 2012 refer attached).
-
On the anticipation that the revised design and modelling is acceptable to Council, we would like it to
replace the previous report that was prepared by WBM and is referred to in the approval. We
appreciate that this will require a change Condition 46 and Condition 49.
In response to the Updated Management Strategy, a number of changes to the layout were necessary
to accommodate the stormwater solution. These changes are relatively minor in nature and broadly
consist of the following:-
2
Section 3
. Amendment to the layout to accommodate the relocated Twigrush Basin. This basin results in a
’link road’ which is located north of the basin. Through access from Twigrush Court to Shire Drive
is no longer anticipated;
. Minor boundary amendments to accommodate the Twigrush Basin and Basins B1A and B1C.
The boundaries of adjacent allotments have been shuffled to accommodate the basins whilst still
maintaining overall yield. It is advised that some lots have been necessarily reduced in area in
order to achieve this outcome, although we note that a minimum lot size of 600m2 is still achieved.
This minimum lot size is in accordance with the requirements of the planning scheme (and
condition 70 of the approval), and was confirmed with Council at our meeting of 20 February 2013
that should this minimum lot size continue to be achieved that there would be no fundamental
concern with reconfiguring the layout in the manner proposed; and
. Amendments to developable footprint to accommodate pedestrian paths and maintenance access
around the basins.
In addition to the above, changes to the staging and minor changes to the road configuration are also
sought. These changes represent a minor amendment to the changes sought as part of the original
’permissible change request’ package, and include the following:-
. The configuration of Lots 177 to 181 have been amended to return to the original cul-de-sac
design;
. Stage B3 has been sub-staged into 2 stages, comprising stages B3 and B4. It is anticipated that
Stage B3 will be delivered first given anticipated timing of sewer services;
.
Stage C3 and part of Stage C1 has been sub-staged into C1 and C2. It is noted that the public
open space, ’link road’ and two basins are included within new stage C1. As previously advised
to Council (email dated XXX), our client is prepared to accept the delivery of new Stage C1 as the
first component of Stage C to be delivered; however, would like to reserve the right to develop the
remaining stages in any order subject to market conditions. Notes on the face of the ’Staging’
Plan (6812-61R) and ’Staging & Lot Summary’ Plan (6812-1620)reflects this.
. Stage C2 has been sub-staged into C3 and C5;
. Part of stage C1 has been included within Stage C4 and previous Stage C4 has been renamed
Stage C6. It is noted that proposed basin B1 C is included within new Stage C4 and proposed
basin B1A is included within Stage C6 as the catchment to which these basins relate are
new
predominantly related to these new Stages.
In order to reflect the above changes to the layout, we recognise that the following conditions and I or
Advisory Notes will need to be amended:-
. Condition 1 -
new version of the Plan of Development: 6812-58J;
. Condition 25 -
the plan number to be updated to: 6812-66E;
. Condition 65.1 -
new version of the plan of Proposed Reconfiguration for non-scheme lots: 6812-
60F, comprising four (4)sheets;
Page 3
Section 4
. Condition 65.2 -
new version of the plan of Proposed Reconfiguration for community titles
scheme lots: 6812-62H, comprising two (2)sheets;
. Condition 66 -
new version of Staging Plan, 6812-61 R, which no contains a second sheet
showing dimensions and areas on all of the remaining lots;
. Condition 81 -
new plan reference: 6812-61 R in table;
. Condition 95 -
new plan reference 6812-61 R in table;
. Advisory Notes 1 & 4 -
new plan reference 6812-61 R in the respective tables.
We recognise that this request for a permissible change to the Development Approval cannot be
implemented until such time as the Court Order for the Preliminary Approval has been amended. As
Council is aware, a concurrent request for a pre-request response is currently before Council in this
regard. The material provides as part of this permissible change request is in recognition of the
benefit of both matters being considered concurrently and to ultimately expedite that finalisation of this
request for a permissible change (immediately following the pending amendment to the Court Order).
We trust this information is sufficient for your purposes, however should you require any further details or
clarification, please do not hesitate to contact Jeremy Scriven (Principal -
Survey) by telephone on 5436
7888.
Yours faithfully
RPS
~
Sian Davis
Senior Planner
Enc.
Options Package provided 15th March 2013
Alternate Twigrush Basin Location sketch provided 27th March 2013
Updated Management Strategic prepared by Browns dated 1ih April 2013
Letter from BMT WBM dated 6th June 2012
Doonella Noosa Stormwater and Water Quality Management Plan Addendum prepared by BMT
WBM dated 27’h July 2012
Updated Plans
cc Stockland Lake Doonella Pty Ltd, Attn: Josh Sondergeld
4
Section 5
Sian Davis
~-
From: Sian Davis
Sent: Friday, 15 March 2013 9:19 AM
To: ’Denis Wallace’
Cc: Kerri Coyle; Mark Lewis; Joshua Sondergeld; ’Barry Kearney’
Subject: FW: Doonella Stormwater Dicussion
-
Attachments: B09182.w _Options_2_3_40NLY_130314 B.PDF; B09182.w-02A_120514.pdf; Doonella
WBNM Model_130314.zip
Hi Denis,
Further to our recent discussions, please find attached various stormwater options that Browns have been
investigating for Doonella Noosa. It is noted that some of the information attached was discussed at our meeting of
20 February, and I apologise for not getting this material through to you sooner. The hydraulic modelling (refer
attached data) had to be reviewed prior to sending through to Council.
You will note that the report references options 2 _
4. Option 1 has been removed as it was identified as being
unviable for all parties.
It would be appreciated if you could send through to Councils hydraulic engineers for review prior to discussion at
our next meeting. Can you please advise the next available date that yourself and Mark (and / or Leon or Rob) will
be available to meet? I understand that Kerri is on leave from Wednesday next week, and appreciate that we may
not be able to meet prior to her departure. In this regard, I can confirm that the tentative meeting time we had
convened for Tuesday at l1am is no longer suitable from our side, but we are available at 3pm if that suits. If not,
please let me know when you are free.
As you know, we are keen to have this matter resolved such that Stockland is in a position to commence detail
design and lodgement of operational works applications over Stage C.
I look forward to hearing back from you.
Many thanks,
Sian Davis
Senior Planner
RPS Australia Asia Pacific
1 Innovation Parkway, Birtinya, OLD, Australia, 4575
PO Box 149, Wurtulla, OLD 4575
Dir: +61 754367807
Tel: +61 754367888
Fax: +61 754936630
Email: [email protected]
www: http://rpsgroup.com.au
This e-mail message and any attached file is the property of the sender and is sent in
confidence to the addressee only.
Internet communications are not secure and RPS is not responsible for their abuse by third
parties. any alteration or corruption in transmission or for any loss or damage caused by a virus
or by any other means.
From: Denis Wallace [mailto:[email protected]]
Sent: Thursday, 7 March 2013 3:52 PM
Section 6
To: Sian Davis
Subject: RE: Doonella -
Stormwater Dicussion
Hi Sian,
I called just now but you’re in a meeting..
I won’t be in the office until Tuesday now and have not scheduled a meeting for Thursday as yet. If you have the
modelling to submit you could try and organise something through Kerri but failing that I will follow up with you on
Tuesday.
Regards,
DEnis Waliace ! SE:llior L’j8VE:loIJ’1 ,eJ; ~’;;::lll!-;E:r
Rp~:i("";:i; ~’\’;:I:I’-qy & f’I;’lIl"II( I f’I,:lIlll ’.q (",: :f:~~lnPi’\ to(,rlll
Sunshine Coast Council
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l::I~ <.-ti,: denis [email protected]
VVE:I:>Si;E; www.sunshinecoast.qld.gov.au
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From: Sian Davis [mailto:[email protected]]
Sent: Friday, 1 March 2013 2:24 PM
To: Denis Wallace
Subject: FW: Doonella -
Stormwater Dicussion
Hi Denis,
I am just waiting feedback from some queries I had an am hoping to get something back late today. However, given
that you are not in on Monday, and as discussed, can we please push this meeting by a week?
The earliest we are available the following is week is Thursday 14 March. Can you please advise if there is a suitable
time on this day to meet?
thanks
Sian Davis
Senior Planner
RPS Australia Asia Pacific
1 Innovation Parkway, Birtinya, OLD, Australia, 4575
PO Box 149, Wurtulla, OLD 4575
Dir: +61 754367807
Tel: +61 754367888
Fax: +61 7 54936630
Email: [email protected]
www: http://rpsgroup.com.au
This e-mail message and any attached file is the property of the sender and is sent in
confidence to the addressee only.
Internet communications are not secure and RPS is not responsible for their abuse by third
parties, any alteration or corruption in transmission or for any loss or damage caused by a virus
or by any other means.
From: Denis Wallace [mailto:[email protected]]
Sent: Friday, 1 March 2013 10:30 AM
To: Sian Davis
Subject: RE: Doonella -
Stormwater Dicussion
2
Section 7
Sian.
Can you give me a call today when you get a chance.
Thanks,
.
DEni!:: ’;.JI<1ce ~,~ l i( ,r L,,:.’:,:.!r,y r t-I ~. ;’;11 .
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Sunshine Coast Council
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’l "i.. [email protected],gov.au
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From: Sian Davis [mailto:[email protected]]
Sent: Monday, 25 February 2013 2:22 PM
To: Denis Wallace
Cc: ’Joshua Sondergeld’; ’Barry Kearney’
Subject: RE: Doonella Stormwater Dicussion -
Hi Denis,
Please find attached the option that was discussed at the meeting on Wednesday last week. The attached sketch is
indicative of the change to the Dodonaea WSL in respect of detention volumes. We are still investigating the
configuration of the other basin/s (and surrounding development areas) in terms of accommodating the link road
through to Beckmans Green and will advise of any additional detail when it is at hand. Can you please send through
the Beckmans’ Green flood model as requested in my email of Wednesday afternoon as this may influence the
outcomes of the modelling?
I have also attached the indicative concept design for the fauna crossing that was tabled on Wednesday for your
perusal.
I look forward to hearing back from you.
Many thanks,
Sian
Sian Davis
Senior Planner
RPS Australia Asia Pacific
1 Innovation Parkway. Birtinya, OLD. Australia, 4575
PO Box 149, Wurtulla, OLD 4575
Dir: +61 754367807
Tel: +61 754367888
Fax: +61 754936630
Email: [email protected]
www: http://rpsgroup.com.au
This e-mail message and any attached file Is the property of the sender and is sent In
confidence to the addressee only.
Internet communications are not secure and RPS is not responsible for their abuse by third
parties, any alteration or corruption in transmission or for any loss or damage caused by a virus
or by any other means.
3
Section 8
From: Denis Wallace [mailto:[email protected]]
Sent: Monday, 25 February 2013 8:22 AM
To: Sian Davis
Subject: RE: Doonella -
Stormwater Dicussion
Sian,
I will also need your further stormwater details/feedback to give to our ecologist and hydrologist. We had mentioned
that was to be provided late last week?
Thanks,
Denis Wallace I ~.jc’llk.r [l8’:!~1<:’1)’1 PI I! ’
(;111’1"1
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f-.Je,rth
Sunshine Coast Council
Pi’(lil[’: 075.~":CJ5 7<:!
’’I di.. [email protected]
VJi--iJ:- i:f:’: www.sunshinecoast.qld.gov.au
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From: Sian Davis [mailto:[email protected]]
Sent: Monday, 25 February 2013 8:12 AM
To: Denis Wallace
Subject: RE: Doonella -
Stormwater Dicussion
Hi Denis,
Thanks for letting me know. If you could come back to me when you hear back from the other attendees that would
be great.
Many thanks,
Sian Davis
Senior Planner
RPS Australia Asia Pacific
1 Innovation Parkway, Birtinya, OLD, Australia, 4575
PO Box 149, Wurtulla, OLD 4575
Dir: +61 7 5436 7807
Tel: +61 7 5436 7888
Fax: +61 754936630
Email: [email protected]
www: http://rpsgroup.com.au
This e-mail message and any attached file is the property of the sender and is sent in
confidence to the addressee only.
Internet communications are not secure and RPS is not responsible for their abuse by third
parties, any alteration or corruption in transmission or for any loss or damage caused by a virus
or by any other means.
From: Denis Wallace [mailto:[email protected]]
Sent: Friday, 22 February 2013 2:33 PM
To: Sian Davis
Subject: RE: Doonella -
Stormwater Dicussion
Sian,
I’ve sent a meeting request to our staff for 1 Oam Wed 6th March and will let you know when I get confirmation.
I will also follow up on those other aspects you raise.
4
Section 9
Regards.
Denis \’-/"I:(,~~(’,~.. Ili,’1 r..,~,’.I’’’’’1 ~II: r’ .:,11" I
P~!;i,,. ’,.
::l,.,>-t;j ,\ 1’1,111’ II~; I it’ll II I .,; ;’..:_"c’:-: l’Itc’ t t.).:>lII,
Sunshine Coast Council
j-"’C>lk: !.’f ’>-I":’.!’:,’ il,
t: I.’:i [email protected]
"’\’Eob~,i’ :’ www.sunshinecoast.qld.gov.au
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From: Sian Davis [mailto:[email protected]]
Sent: Wednesday, 20 February 2013 5:26 PM
To: Denis Wallace
Cc: Kerri Coyle; Mark Lewis; ’Joshua Sondergeld’; ’Barry Kearney’
Subject: Doonella -
Stormwater Dicussion
Hi Denis,
Further to our meeting this afternoon, can you please confirm availability for a follow up meeting on Wednesday 6
March at 2pm? Prior to the meeting we will target getting through to you some further modelling information /
options in relation to the matter of stormwater.
As discussed, can you please advise any feedback from Council’s ecologist in relation to the vegetation regime in the
vicinity ofthe current Dodonea basis in terms of likely impact of stormwater detention in this area -
particularly in
light of the reduced timeframes of detention discussed at our meeting today?
Also, following our meeting please be advised that we went to site and had a further look ’on the ground’ of the
upstream stormwater catchment. Preliminary thoughts are that there is unlikely to be any change to the modelled
detention to date -
however, Barry will be looking into this a little further, and we will advise in due course.
And finally, we have had a look on PDOnline and have been unable to track down a copy of the flood modelling data
/ report with respect to Beckmans Green. Can you please forward through a copy?
I look forward to hearing back from you.
Thanks heaps,
Sian Davis
Senior Planner
RPS Australia Asia Pacific
1 Innovation Parkway, Birtinya, OLD, Australia, 4575
PO Box 149, Wurtulla, OLD 4575
Dir: +61 7 5436 7807
Tel: +61 754367888
Fax: +61 754936630
Email: [email protected]
www: http://rpsgroup.com.au
This e-mail message and any attached file is the property of the sender and is sent in
confidence to the addressee only.
Internet communications are not secure and RPS is not responsible for their abuse by third
parties. any alteration or corruption in transmission or for any loss or damage caused by a virus
or by any other means.
5
Section 10
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6
Section 11
BROWN
’’;’’..111’’ t’ !"
Doonella OPTIONS Analysis OPTIONS 2-4
B09182.W
BROWN Consulting: B09182.w, 14/03/2013, MS, IP
Below is a summary of the options investigations as requested by the client. It should be noted that
for Options 2-3, with the incorporation of additional basins, runoff of up to 100 Year ARI from their
corresponding catchments has to be diverted to the respective basins for the water quantity
strategies to be effective. Assumptions in this analysis are carried from Brown Consulting Report
B09182.W-02A dated October 2011.
OPTION 2:Strategy incorporates Basins B1A and Ble and original Twigrush Basin.
As required by Sunshine Coast Council the Dodonaea Basin is to be removed from the strategy. To
mitigate peaks flows, Basins B1A and B1C have been included. They are to mitigate the flow from
their corresponding developed catchment areas. Twigrush (original configuration) basin has also
been included 0 mitigate the flows from the removal of Dodonaea Basin. The basin design
requirements are shown in the Table 1 below; refer to sketches for sizing of basins. It should also be
noted that for this option runoff from Sub Catchment 2B2 bypasses the Twigrush Basin.
Table 1: Original Twigrush Basin Configuration
Twigrush Ba~in
OPTION 2 Basin B1A Basin B1C
(original size)
Upstream
B1A B1C 0,C3,C2
Catchment
Storage Volume
1080 1100 1,210
(m3)
Design Depth (m) 1.2 1.2 1.8
Basin Invert RL (m.
8.5 13 7.5
AHD)
Basin Top RL (m.
10 14.5 9.6
AHD)
As expected with the original sized Twigrush basin and the removal of Dodonaea basin, the strategy
does not meet the requirements of mitigating peak flows (apart for the 2 year ARI). Refer to Table 2
below.
Table 2: OPTION 2 Results
Existing WBNM Developed WBNM Change (%)from Existing
ARI
(Peak Flow m3/s) (Peak Flow m3/s) Scenario
2 0.89 0.88 -0.9%
5 1.42 1.56 10.1%
10 1.75 1.99 13.6%
20 2.20 2.51 14.1%
50 2.61 2.94 12.6%
100 3.07 3.42 11.3%
B09182.W_Options_2_3_40N LV _130314.docx Page 1
Section 12
BROWN
,’"Uift ..
Basin BlA and B1C alone do not have adequate capacity to replace the Dodonaea basin. The reason
behind OPTION 2 failing to meet requirements is that Basins B1A and B1C (as stated previously) only
mitigate their relevant catchments. The Dodonaea basin previously mitigated stormwater not only
from urban development catchments of B1A and B1C, but also catchments B1B (upper
environmental corridor catchment) and catchment A (external catchment upstream).
OPTION 3: Strategy incorporates Basins 81A and B1e, Original Twigrush Basin and an optimized
Dodonaea Basin.
OPTION 3 offers a strategy with the Twigrush basin at its original size as well as Dodonaea, B1A and
BlC basins.
The configuration of Dodonaea Basin outlet also updated to achieve non-worsening objectives. The
configuration of the outlet for the Dodonaea Basin to achieve this objective is presented in Table 3
below. The Twigrush outlet structure has been kept to its original configuration and that for this
option runoff from Sub Catchment 2B2 bypasses the Twigrush Basin.
Table 3: Options 3 Dodonaea Basin Configuration
OPTION 3 Dodonaea Basin Twigrush Basin
Upstream Catchment A,B1B C1, C2 & C3
Basin Invert RL (m.AH D) 9 7.5
Basin Top RL (m.AHD) 12.25 9.6
1 x 525mm dia RCP
Outlet Structure 1 x 450mm dia RCP
2 x 225mm dia RCP
The results of the analysis indicate that the outlet structure configuration as shown above (Table 3)
achieves the non-worsening objective. Results are shown in Table 4 below.
Table 4: Options 3 Results
Existing WBNM Developed WBNM Ch;mge (%)from Existing
ARI
(Peak Flow m3Is) (Peak Flow m3/s) Scenario
2 0.89 0.83 -6.7%
5 1.42 1.39 -2.2%
10 1.75 1.75 -
20 2.20 2.19 -0.3%
50 2.61 2.53 -3.2%
100 3.07 2.89 -5.9%
Results show that there are insignificant changes in peak water surface levels (WSL’s) within the
Dodonaea basin as previously specified in the previous report B09182.W-02A. Results are presented
in the Table 5 below. Changes in Volume in the Dodonaea basin are presented in Table 6 below.
B09182.W _Options_2_3_40NLY_130314.docx Page 2
Section 13
BROWN
\".:111’ I ’.,
Table 5: Options 3 Dodonaea Basin WSl Results
Dodonaea Basin
ARI Previous Peak WSL OPTION 3 Peak Change in WSL (m)
(m.AHD) WSL(m.AHD)
2 10.81 10.03 -0.78
5 11.32 10.42 -0.9
10 11.59 10.62 -0.97
20 11.90 10.89 -1.01
50 12.04 11.12 -0.92
100 12.11 1l.33 -0.78
Table 6: Options 3 Dodonaea Basin Change in Volume 1m3)
Dodonaea Basin
ARI Previous Peak Volume OPTION 3 Peak Change in Volume
(m3) Volume (m3) (m3)
2 479 99 -380
5 950 250 -700
10 1304 360 -944
20 1808 538 -1,270
50 2073 739 -1,334
100 2202 962 -1,240
Significant changes are seen in the detention volume and the WSL between the previous model and
Option 3. A reduction in the time for the basin to drain has also been determined. It takes
Dodonaea Basin 30 minutes less to empty during a 100 year ARI event then previously determined.
The times for Dodonaea Basin to empty are present in Table 7 below.
Table 7: Options 3 Dodonaea Basin Emptying Time
Previous Emptying OPTION 3 Emptying Change in Time
ARI
Time (min) Time (mi.n) (min)
2 120 100 -20
5 165 150 -15
10 175 155 -20
20 185 155 -30
50 195 165 -30
100 175 145 -30
Times given for storm durations producing the peak WSL’s with the basin.
OPTION 4: This strategy analyses the developable areas of Stage C only. The upstream catchment
and drainage reserve (environmental corridor) are not considered in the model. Basins B1A, B1B
and Twigrush have been optimized to mitigate their upstream catchments only.
OPTION 4 applies a strategy where the analysis is only made in the development areas, and basins
are sized to mitigate those areas. Therefore, mitigation effectiveness is analysed by a per basin
basis.
An existing scenario has been modelled for the three developable catchments. Results of Peak Flows
are shown in Table 8 below.
B09182.w_Options_2_3_40NLY_130314.doex Page 3
Section 14
BROWN
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Table 8: Options 4 Existing Peak Flows
Existing WBNM (Peak Flow mj/s)
ARI
BlA BlC Twigrush
2 0.15 0.20 0.21
5 0.24 0.32 0.34
10 0.29 0.38 0.41
20 0.35 0.47 0.50
50 0.41 0.53 0.57
100 0.48 0.62 0.65
For the developed scenario, identical basin configuration as previous options have been used for BIC
and BIA, and the original sized Twigrush Basin configuration from (OPTION 2) have been adopted.
With the objective being to mitigate developed peak flows to existing conditions with the smallest
basins possible, factors were input into the model to optimize basin sizes to achieve the non-
worsening objectives. For BIA, BIC and Twigrush size factors of 40%, 55% and 65% were used
respectively. Table 9 shows the resultant peak flows and Table 10 shows the changes in Peak Flows.
Table 9: Options 4 Developed WBNM Peak Flows
Developed WBNM (Peak Flow mj/s)
ARI
BlA BlC Twigrush
2 0.08 0.18 0.20
5 0.20. 0.24 0.25
10 0.25 0.30 0.27
20 0.36 0.42 0.32
50 0.43 0.53 0.52
100 0.49 0.63 0.66
Table 10: Options 4 Percentage Increase in Peak Flows
Increase (%)from Existing Scenario
ARI
BlA BlC Twigrush
2 -51.3% -8.1% -5.3%
5 -19.3% -24.1% -27.4%
10 -13.1% -21.4% -33.3%
20 2.8% -11.1% -37.1%
50 3.9% -1.5% -8.8%
100 1.4% 1.3% 1.7%
It should be noted that the analysis for Option 4 does not take into account the timing of peak flows
from the upstream external catchment. Council may not accept this option as it is not a full
catchment analysis (which has previously been provided) and does not account for peak flows from
the site and upstream catchment coinciding.
B09182.W _Options_2_3_ 40N LV _130314.docx Page 4
Section 15
BROWN
,’m.lIl .’
Summary of Results
. To gauge the effectiveness of Basins B1A and B1C, Option 2 was modelled with only the two
basins and the original sized Twigrush Basin. Dodonaea Basin is not included in the Option 2
model. The results indicated that the two basins upstream are not sufficient in mitigating
peak flows with increases of up to 15%.
Option 3 strategy incorporates basins B1A, B1C, Twigrush Basin and the Dodonaea Basin. For
this option the reduction in Water Surface Levels (WSL’s) in the Dodonaea Basin are
significant (0.78m to 1.01m). The time in which it takes the Dodonaea basin to empty has
reduced, up to 30 minutes shorter than previously to empty during a 100 year ARI event.
. The analysis of site only developed areas in Option 4 has shown that the basins can be sized
at 40%, 55% and 65% of capacity for basin B1A, B1C and Twigrush respectively to achieve
the non-worsening objective. It should be noted that the analysis for this option does not
take into account the potential for peak flows from the site and upstream catchments to
coincide and may not be acceptable to Council.
B09182.W _Options_2_3_40NLY_130314.docx Page 5
Section 16
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