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132004.240018.A - Request to change an existing Approval

of 13

Text shows just the words. Original shows the document exactly as it was published.

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     THG
           Development Services
           NOOSA COUNCIL
           PO Box 141
           TEWANTIN QLD 4565



           Our Ref: 25030
           29'h August 2014



           Dear Sir or Madam,

           RE:        REQUESTTO CHANGE AN EXISTINGAPPROVAL IN ACCORDANCEWITH SECTION369
                      OF THE SUSTAINABLE PLANNING ACT 2009 - MATERIAL CHANGE OF USE
                      (PRELMINARY APPROVAL) - GREENWOOD GROVE ESTATE - LOT 28, GARNET
                      STREET,COOROY (LOT 28 ON SP230060)
                      [COUNCIL REFERENCE:132004.240018.6 (23689DA))

           In relation to the above application for which a Permissible Change Approval was most
           recently issued by Council on the 7'h April 2011, in accordance with Sections 369-372 of the
           Sustainable Planning Act 2009, we request a further permissible change be made to the above
           mentioned development approval.

           Specifically, the following change is requested:
           •  Condition 65.1.2 - We request that following requirement be removed from the
              conditions: The upgrading of Garnet Street shall also be designed to enable flood free
              access to the site during a 1 in 10 year ARI flood event with a maximum trafficable depth
              of 300mm for a 1 in 100 year ARI flood event and with the praduct of flow depth and
                 velocity being less than 0/4m2/s.

                 We understand that a recent meeting was held (on the 31" July 2014) between Council
                 and SMEC (project engineers) where the inability to achieve the aforementioned design
                 requirements was discussed in detail. A detailed understanding of the constraints
                 impacting the achievement of this condition requirement has been outlined within the
                 attached SMEC correspondence dated the 19th August 2014. We understand that
                 following this meeting Council was supportive of amending the aforemented Condition.

           In addition to the above, we advise that a copy of this permissible change application has
           been forwarded to SARA as a result of the Department of Transport & Main Roads (DTMR)
           being a Concurrence Agency for the original application.                               ?




           Brisbane                     Office locations          [email protected]
           16 Julia Street                      Mackay            www.thgc:om.au
           PO Box 1038                          ProserpIne        THG WSG Pty ltd
           Fortitude Valley Qld 4006            Bowen             ABN SS 156 210 052
           Phone (07) 3666 4700                                   trading as THe Resource Strategists




                                                             \8 o x. ~~        .      R: ..~.\
Full text of the other 12 pages

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         Further, we understand that a copy of this Permissible Change Application will be forwarded
         by Council to Unity Water.

         The following table provides demonstrated compliance with Section 367 of the Sustainable
         Planning Act 2009, which defines a permissible change for a development approval.

                   PERMISSABLE CHANGE CRITERIA               I                         RESPONSE
          (1) A permissible change, for a development approval, is a change to the approval that would not-
          (0) resuft     in   a   substantialfy    different   The proposed change seeks merely to delete a design
                development; or                                component (Le. flood immunity design requirement) within
                                                                1 condition which relates to the construction requirements
                                                                of the external road upgrade of Garnet Street. The ultimate
                                                                road   classification and   associated    verge/pavement
                                                                treatments and widths will still occur in accordance with
                                                                Council standards.

                                                                We do not believe that the above mentioned changes will
                                                                result in a substantially different development.


          Ib) if the application for the approval were          As a result of the proposed changes as outlined above, if the
              remade including the change-                      application were remade today we do not believe that the
                   i.    require referral to additional         application would require referral to additional referral
                         concurrence agencies; or               agencies as a direct resultant of the change.
                  ii.   for an approval for assessable
                         development that previously did        The original application was impact assessasble.
                         not require impact assessment-
                         require impact assessment; or
          Ie) for an approval for assessable development        As noted above, the original development        application was
              that      previously        required    impact    Impact Assessable.
              assessment-be       like/y, in the responsible
              entity's opinion, to couse a person to make
              a properly made submission objecting to the
              proposed change, if rhe circumstances
              allowed; or
          Id) couse development to which the opproval           The proposed changed application does not include any
              relates     to    include      any   prohibited   prohibited development.
              development.


         In light of the above, we believe that the request to change the existing development
         approval for the Capestone Estate, represents a 'permissible change' as defined by the
         Sustainable Planning Act 2009 and as such, we look forward to receiving Council's written
         confirmation of the same at your earliest convenience.

         Please find enclosed the following information, which constitutes a 'properly                                   made
         application' under the Integrated Pianning Act 1997:
             Our client's cheque for $935 which is the relevant Council application fee;
             A copy of the IDAS Form - Request to change an existing approval;




         Page I 2

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     •   A copy of the correspondence forwarded to SARA (dated 29th August 2014) incorporating
         the following Referral Agencies (Concurrence Agencies):
         •   Department of Transport & Main Roads;
                                             th
         SMEC correspondence dated the 19 August 2014.

     We advise that a copy of this permissible change application has also been forwarded to the
     State Assessment & Referral Agency as a result of the Department of Transport & Main Roads
     being a Concurrence Agency for the original application. This correspondence (forwarded to
     SARA under single referral letter) was lodged via MyDAS on the 29th August 2014, a copy of
     which is attached.

     Should you have any queries with regards to this matter, please do not hesitate to contact this
     office on (07) 36664700.

     Yours Faithfully,




     Nathan Wilson
     Urban Planner




     Page I 3

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 •



                                                                                                                                                                              .':: ,,'",
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                                                                                                                           Suslalnable Planning Act 2009

I',""-,.ALLqueslions      MUSTbe i:ompl~i;d~nless the f~;;;;indicales otherwise... '
               .~".:-.':'.:'~'       >:'.- :: ..~ ,"   " .•..., ,.', .. - :.. , ;..-.<_........                                       .;,
I this    formmust be submitted 10 Councilaccompanied by the applicablefea....                                           ...       ,':,.:.:,,;.'.', :'... " .. '
, Att~cl{-~Xt;;:P~.9~~'li-th.~r~.i~.insuffi~~'t~.pa~;-o~.'-thi
                                               fo~in';_:::'.'.'!;"::~:"::'_:':.'.:.,-                   ':        .':.   :.:~'~..:':::.~;g/~L_~~:f;";
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\1( c~u.h~ir~as.ih~A;S.;s~~e~t,M~na9~;'(~(;~~~.xisli~9'~P,P,;;~al.'~i,d
                                                                     th~:ap'prov~iwa~IS~~e.'Jby Ihe c~~:me~::.:                                       .
I (a) a request to changa tha davelopment approval andlor condltlonsfs mada 10tho Court;ond ,,..:.'....~<';"i"'::. ,:.. .


I;~~P1u~it"':;~:(~~                 [~~f~~t;:;~!~f~\~f,~0t~;~~~i~i~.~~~~~&cl~oo~.~r.~~~1~!i:i~t:~ii~n~g:~1~I~ltoi,                                                        ."



Full name -lndl~ldual or company                    f'~-r~             <    '10     ~
ContaclName-forcompany                       NI'''T\l~             N\l_~
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                       fb 1So'l'- 10;58
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           .NH
Postal address

                                                                ~h~ne ~--"-IStateQ~-Mo~le                                ~-[postcode               -TjOO6--'-'
Email address          ~~J~L.~.,"""" ...                                    G.A.J                              ! Fax                                                    ...


Type of approval (please tick ALL applicable categories)                                Which entity Issued approval?
iii' Development Permit                                                                 rs(' Council
o     Preliminary Approval                                                              o   Other entity - pleasa spaclfy
o     Compliance         Permit
Fi Material Change of Use
~     Reconllgurlng a Lot
o     Operational Works
o     Building Works
o     Plumbing or Drainage Works
o     Compliance         Certlficale
o     Environmentally          Relevant Activity
Application numberlcouncll reference _,~~      •.~,?,?\~:~                                  (~Sb}l,9j:~T~_-::-]
                                                                                                           Date.!~sued07 :.?If _~l_.~                          <


Is the approv~mo?!I:...and      temporary ERA?             '-<                                         !if No                  0      Ves - complela below
Insert tha name of each local government area in which the _n1.0,,!I
                                                                 •.!'~~_t~mporary ER:~_ispropos".'!..t? ?I'~~teloperatinl!....




Privacy
Council will use any porsonallnformalion provided tor lhe intended purposo only and tor remainIng In contact Yoilh you. Council 19aulhorised to collect
this Infonnalion in accordance 'Ni\h the Local Governmenl Act 2009 and olher Local GovemmelJt A<;ls. Your personallnk'llmallon Is only [lcl,;Cssed by
pP.f!;MS RlJlhorised to do so, Your personal informallon Is dealt .•.•ilh in il.ccllrdanc:e wllh councts p,ivocy policy.

WWN   naasa aId gav au
pn Br'llC 141 TowOlnlln 01(1.4565
                                             I   [email protected]
                                                                                              I
                                                                                               T 07 53296500
                                                                                                  AAN 97 96r12111 121

                                                                                                                                                             Page 1 of 4

Page 5

                                                                                                        ! 0 To extend lhe relevanl period                   /
        approval                __   '''. -'     <:~di~ns_    .. , ..,..   ..'            before lapsingi,                                                  I
    Please attach documenlallon    outlining the detail of and the reasons and Justlflcallon for the requested                          change or           I
    e,xtenslon.                                           -:.,., •                                                                                  .   ..I.




    5. Concurrence      Agencies
,was lhere one or more concurrence agencies involved In the original approval?                              0 No
                                                                                                           ,&,Y~s-:p(ovide details below
                                                                                                                                                    J   .
    Not. - Under s372 0' the Suslainobl. Planning Acl 2009lhe person ';'.king the request Is required 10give a copy of this requesllo a~
    concurrence agencIes.
                                                                                                                                                            I

                                  _._---------------------~                                                        _. __                     ..
                                                                                                                                              _j
                                                                                                                                                         .i
    6. Pre.request     response     noUce
     Has a pre-request response been given by a relevanl entity (e,g. a concurrence agency) for this request?
    i'lN-;;-                                             ~._            lo~es                            ,',"._,
                                                                                                             ..-   ,.on   •••••••••••        • __




    If yes, please attach a copy of the notice.
                                                                             .. .._----------------------'

    7. Owner's consent
iIs the owner's consenl required for lhls request?                         l!:.~.o                                                       .               1
I                                                                          I~Yes- complete eIther Table A or Table B below                               I
!   Not-e'-'-'-fm-o,-e-th-a-n-o-ne-o-w-n-.-r                          ~~;e'q~l:ed""
                                     -of-lh-e-la-n-d-a-lI-ow-ne-r-s'-d-e-la-.I!-~
                                                                                  ---,--------------
                                                                                                     .                                              .J

    Owne(s namels             f~_e_T_No_._9~o_~_!-=_~ _                              Owner's   name/s                                                    I

.lfWe. the above-mentioned ownerls of the land, consent                              o The owne(s wrillen consent is attached.
                                                                                                                                                    ..J
  to the making of Ihis requesl.
                          t        .- .••_-

ISignature/s
"
                                                                            Peel No 90 Ply limiled ACN 117 354 195 by ils duly authorised
                                                                                          o...v-> (""-" -<;;"""Q,,-           ':lw._ .....•.......
                                                                                                                                            ~"-
                     _J
                                                                            allorney
                                                                            Level-<.Allorney - under Powerof Allorney No. 713519829 and
IDaie                           lB~ )~,~-"                                  who has received no notice of revocation of that <lUorncy and who
                                                                            warrants lhal they have the requisite power under lhat attorney.

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               , .
                   , ;......
i NOTES: ~or qu~stlcJn]
                                                                                                   ¥ .•••••   , ••.•••••••
                                                                                                                         -.~-.


                                                                                                                                                       .~.',                           ....
,.               '", :';'; .., .,.... ; ..                  -'                                                                             .,
i Under section 371 01the Suslalnable Planning Act 2009, II the person making the request Is nol the owner 01 the land to which the
I approval r~I~\es, the req~est must be accompanied by the ownars ci>nsenL                                                       ' '. ,               '..                              .,'•                          . .
I However, ownersconsentls not required If the approval '
I         ,. _"        .'~.                  ".""   '            ~",         - ...
                                                                                            .'.
                                                                                             -                                   . '
                                                                                                                                       .
                                                                                                                                                '"
                                                                                                                                                        ".'             .,','~                       . .
                                                                                                                                                                                                     .'-
                                                                                                                                                                                                                     .'.
i _.', relates.to.land tha was acqulsillon land.to whichsecllon                                  263(2)(d) of the Sustainable Planning Act 2009 applied when the
!           ~ppUcatlo~forlheapproval~as.m.aqe;or.                        . --:: ,"     ';":.. ,", .... ": :.;'                     ':::':"',,- .;..   >::":":     .;:        .        '{. '".': ;',.:-.'        :.,>~/;
I ,t        I~   j~;
                   'b~ildl~9' ';'~rk ~; ~p~railo~al ....;,rklo~'ih~suppl~' ~f;;'nim~nlty Inf~asi;"ci~r" on 'Iand d;"lgn~tOd io~:the' '~mmUfllY:
     ...\!rrras~!'-'~tu,~~;
I ,:;'~;               or;.:., :'.:,:.....              :.: ~:;..'....    ....~'. ," i:':" ,;'        ",: .":,:., '. :', :'} .. :"              :", ';.\, '. :.':<                       '    "> ; "',:';;-.'. ::'.}~'~"'
I ~.,"~
     the consent of the ownor would not be required under section 263(1) of the S~slalnabl. Planning Acl 2009 If a development
                                             ~<.-..<'>,,: ;-::.-,.: '. - '>;:.\;;~' "\:";". "',
L>;.~:app}~~~!~nY',~~em~,~.~.r?.~.t.he_~_~~~est~dch~nQ~\:,~';:':-"',                               : \' ....;. ": .
I ~I$O,o","e~s,c,o~~e~ti~ nO.lrequlred,if t~e f"ses~~ent~a~ag",r iss~!\sfied, lI;at .
                                                                        . . ". . ..   .?:       , . .'
,_       the number of owners of the land onake II Impractical to obtain owners' consenl, end lhe requested change does not matertally                                                                                      !
    >    affec~th~~,,:n",rs;'and:or   .'. '    .. ,..   ....          ,:    "          ,.".'.                ,.\              ::                                                                    ";,1
     _. having regar~to"the nature "of the. proposed change. -ttie ~'MIer.has unreasonably, wilh~e'd.cons81"!t and the requested change i
                                  J

    '<, >'~oesnofmalerially'affect the owniir's'land.""    ---', .'."' ,,:, .... -.. .      '_~ "_.~~;~_ \ .... " -..... ::'. - ,-.. - ;.:' ,\




    .     No




    I~~~:~~~,?:::::.,
           ....
    •Attach a copy of the evidence required                       ebove
                                                                                ~= 10 •••• "'~. ",,~~.,~:~;-;;,"~
                                                                                                                                                                                 .••. _'"     ,__ .
                                                                                                                                                                                                               •. :.
        N~~!~~.:r~,~q~~~~oF~.-::.<;;.:.'.'
                            .   . .".,.                                               ;~",:"".:"'.:
                                                                                                 ",:."
                                                                                                     ..                                    ".                 .              ." :-;'.~:~:';
                                                                                                                                                                                     "":.{.~~'.,'::::,.;".
        Seclion 370(3) and (4) of the Sustainable Pla~nlngAct 2009 requireslhat If an application for the development approval were made at
        Ihe Uoneof making this requesl andevldence,under 5001l0n264(1) of,Ihe Sustainable planning Act 2009 would be required to support
        'he app1icatiOn,J~is:rcquesfmust. be lJccompanled.,byjtie w.rltten,,'agreemenr"of lh(chi.ef exeCutive from'-wh~m eyiden'ce.'Nould be
                              ..\~:';\.i..;'.':"'. ;~/ ,.:<:..,,:;.. ~,
        re~,~k~~,P~.~~_~.~.e~~!~,~:.t6.~.(,V~;:.,:'                                               ~\ \.,>.' "',::'."';~':".
                                                                                                                       "~:'_:
                                                                                                                            ~::, ...                                       _ .':., ::t.':                       ".
        Section 264.orthe Sustainable Planning Act 2009 provides that If adevelopment Involves a State resource,'a regulalion may require!
        the eppllcallon to be supported by certain evidence piescribedundefrOgulation: Schedule 1401.the Sustainable Planning Regulation I
        2009
          ___'
               prescribos the Stale'resour~
                                      __
                                              for which evidence'
                                           ~•• ~          •..~
                                                                   is 'required
                                                                ,,>-_.     .
                                                                                to be given, and the' evldeneer'equlred,'to
                                                                                                                     '
                                                                                                                            support the applicatlon. '1t

        9. Dc.lorotion          of appllcanl
        IfINe, the epplicant, declare that the above Information is correct in all respects, at Ihe time of lodgement of this
        application with Council. Should any of the details given In relalion 10 this application be changed in the fulure. the
        appl~~~! s~aJI advise Council in writing prior 10any such cha.nge ~.~!n_g
                                                                                ~rnP!~.rn''"ted,
        Signature's                                                                              " 'IDate                                                               'J7-:-if-:7l(




                                                                                                                                                                                                           Pflge 3 of 4

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                                                                                                                   ,'.'.. i




                                                                                                                  , ':~:.l
                                                                                                             ..    .]
                                                                                             ._------_._-   ._-~~:,-
                                                                                                                ..   ' :.:-




In person   19 Pelican Street, Towanlin: 8.30 am to 4.30 pm Monday 10 Friday (excludes public holidays).
By mail     iCh~q'ue or money order 10be mado payab'le to Noosa C~uncil. -
I_ _ _J 0 Cheq;;;-             .-      I0~!~ney o;~~             -' 0 M~~iercard:   ----liJ Visa
                                                                                                            Page 4 of 4

Page 8

.;..




  THG
        Regional Services - SEQNorth
        Department of State Development, Infrastructure and Planning
        Queensland Government
        PO Box 1127
        MAROOCHYDOREQLD 4S58
        Lodged Via MyDAS



        Our Ref: 25030
        291h August 2014




        Dear Sir or Madam,

        RE:        REQUESTTO CHANGE AN EXISTINGAPPROVAL IN ACCORDANCEWITH SECTION 369
                   Of THE SUSTAINABLE PLANNING ACT 2009 - MATERIAL CHANGE Of USE
                   (PRELMINARY APPROVAL) - GREENWOOD GROVE ESTATE - LOT 28, GARNET
                   STREET,COOROY (LOT 28 ON SP230060)

                    [COUNCIL REfERENCE:132004.240018.6 (23689DA)J

        In relation to the above application for which a Permissible Change Approval was most
        recently issued by Council on the ]'h April 2011, in accordance with Sections 369-372 of the
        Sustainable Planning Act 2009, we advise that a further permissible change to the
        development approval has been requested from Noosa Council.

        The reasons behind the requested changes to the aforementioned conditions are outlined in
                                                                                       1h
        detail on the attached correspondence forwarded to Noosa Council and dated 29 August
        2014.

        Please find enclosed for your information, a full copy of the information recently submitted to
        Moreton 8ay Regional Council in relation to this permissible change application:
                                                               1h
            THG Cover Letter to Noosa Council (dated the 29 August 2014) outlining the requested
            changes;
            A copy of the IDAS form - Request to Change an Existing Approval;
            SMEC correspondence dated the 191h August 2014; and
            Copy of the current development approval dated the 71h April 2014.

        We provide this information to the State Assessment & Referral Agency (SARA) as required
        under Section 372(1)(c) of the Sustainable Planning Act 2009 with regard to the following the



        Brisbane                   Office localions     [email protected]
        16 Julia Street                    Mackay       ww,v.thg.com,au
        PO Box 1038                        Proserpine   THe WSG Pry Lld
        Fonitude Valley Qfd 4006           Bowen        ABN 55 156210052
        Phone (07) 3666 4700                            trading as THG Resource Strategists

Page 9

."" ,




        Department     of Transport   & Main Roads being a Concurrency       Agency for the original
        application.

        Should you have any queries with regards to this matter, please do not hesitate to contact this
        office on (07) 36664700.

        Yours Faithfully,




        Nathan Wilson
        Urban Planner




        Page I 2

Page 10

                                     SMEC

Levell,                        Building C, 6 Innovation        Parkway
Birtinya,                      OLD 4575, Australia
(PO Box 179, Buddina,                          OLD 4575, Australia)
T +61 7 3029 6700 F +61 7 5437 6525 E [email protected]
www.smec.com



19 August                        2014


Noosa Council
Po Box 141
TEWANTIN OLD 4565


Attention:                       Mark Lewis,


RE: Changes To Existing Approval                                  Conditions.             OPW 12/0339

Further to our meeting with Council on 31 July 2014, on behalf of our client PEEl Limited, SMEC seek approval
from Council to amend Condition 65.1.2 of Application No. 132004.240018.6 (23689 DA).

This condition relates to the upgrading of Garnet Street to enable fiood free access to the site during a 1 in 10
year Average Recurrence Interval (ARI) flood event and trafficable access in a 1 in 100 year ARI fiood event

Further to the previously provided Hydrology and Water report (2014) titled "Garnet Street Culvert Upgrade
Hydraulic Assessment" the information below is provided to support the application to amend the current
conditions of approval.

Constraints associated with compliance with Current Approval Conditions

The current approval conditions in relation to the Greenwood Grove estate require the upgrade of Garnet
Street (Cooroy Creek crossing) to provide full immunity in a 10% Annual Exceedance Probability (AEP) rainfall
event and be safely trafficable during the 1% AEP rainfall event.

After detailed modelling and consideration of road geometry and drainage eiements, the following constraints
limit the ability to achieve compliance with the condition:-

1.             Garnet Street in its existing formation provides flood mitigation. Alteration of road levels and pipe culvert
               configuration must ensure non-worsening both upstream and downstream of Garnet street.

2.             The ability to raise Garnet Street in combination                              with increased culverts to achieve the desired immunity
               has limitations           in the form of:-

                           a.     Maintaining the sag point at Cooroy Creek;

                           b.     Earthworks / embankment              extents to be maintained                    within the road reserve;

                           c.     Close proximity of Cooroy Creek immediately adjacent to the road reserve(bend upstream)

                           d.     Changing existing overland flow paths and

                           e.     Impact on adjoining private properties.

The most recent design (Refer updated Civil Drawings) proposes to raise Garnet Street to what is considered to
be the malCimum levels without changing or elCceeding the above mentioned limitations.

Given these constraints and limitations, configuration                                        and sizing of culverts has been determined                   to limit non-
worsening of upstream and downstream conditions.




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Page 11

Current Inundation   Times and Levels

The Hydrology and Water report (2014) titled "Garnet Street Culvert Upgrade Hydraulic Assessment" indicates
that currently Garnet Street experiences the following time of inundation and flow depths:-

Table 1- Current Inundation Times & Peak Flow Depths


Event                                    Inundation time                      Peak Flow Depth (over Road)


2-Year ARI event (39% AEP)               6 hours                              0.5m


10-Year ARI (10% AEP)                    12 hours, 20 minutes                 0.8m


lOO-Year AR111%AEP)                      21 hours                             l.Om


Currently Garnet Street is not trafficable     during any of these rainfall events and is inundated        for extended
periods of time.

The most recent design being proposed and referenced in the Hydrology and Water report 12014) titled
"Garnet Street Culvert Upgrade Hydraulic Assessment" indicates significant improvement of times of
inundation and peak flood depths. Refer Tabie 2 below.

Table 2 - Proposed Inundation Times & Peak Flow Depths


Event                                I   Inundation time                      Peak Flow Depth (over Road)


2-Year ARI event (39% AEP)               Nil                                  Nil

                                         (Approximate 6 hour reduction)


10-Year ARI (10% AEP)                    2 hours, 40 minutes                  0.18m - Safely trafficable

                                         (Approximate 10 hour reduction)      (Peak Velocity-Depth Product      = 0.121
100-Year ARI (1% AEP)                    5 hours, 20 minutes                  0.4m -

                                         (Approximate 16 hour reduction)      (Peak Velocity-Depth Product      = 0.6)
                                                                              (Refer Emergency Vehicle Access
                                                                              references below)


Note that the above-mentioned     improvements/reductions       have been achieved with a blockage factor of 20%
applied to the existing and proposed culverts.

Emergency Vehicle Access

Reference is made to the Australian Emergency Manuals Series Part IV - Skills for Emergency Services
Personnel titled "Manual 8 - Four-Wheel-Dr;ve Vehicle Operation". Section 5.26 to .5.35 details the safe
operation of four wheel drive vehicles during a water crossing operation. This section discusses the required
preparation for deep water crossing whereby "If the water depth is greater than about 750mm, prepare the
vehicle as follows ..... :. This section of the manual indicates that four wheel drive emergency vehicles can safely
navigate through water crossings less than 750mm deep provided the velocity-depth product is less than
    2
0.6m /sec.

The velocity.depth product of 0.6m2/sec is provided in Queensland Urban Drainage Manual (QUDM - 2013) and
described as "The praduct of depth d, and velocity v.~ In the kerb and channel should nat exceed O.6m'/sec
(Engineers Australia, 20l0) to reduce hazard for pedestrians within the roadway."

The modelling results identified in the Hydrology and Water report (2014) titled "Garnet Street Culvert Upgrade
Hydraulic Assessment" indicate that the most recent design case will incur flow depths of OAm and velocity-
depth product of 0.6m'/sec during the 1% AEP. On this basis, an emergency vehicle can safely negotiate Garnet
Street during a major storm event.




                                                                                                                         2

Page 12

.   ,



        Bridge Option Analysis

        Consideration   has been given to a proposed       bridge across Cooroy Creek however, this option      has been
        dismissed given the flood mitigation measures that are provided by the culverts.

        The culverts in their proposed form will reguiate flows to ensure upstream and downstream conditions are
        "balanced" to a point where non.worsening of private properties is achieved. The construction of a bridge
        effectively removes this mitigation and has the potential to increase flooding downstream of Garnet Street.

        Furthermore, given the substantial floodway width across Garnet Street and the physicai constraints of the
        Ccoroy Creek alignment, construction of a bridge is not considered a viable option.

        Blockage Factors

        Queensland Urban Drainage Manual (QUDM - 2013) provides suggested a blockage factor of 0% for a clear
        opening greater than 3.0m. Table 10.4.1 - Suggested blockage factars far culverts highlights that a design
        blockage value of 20% should be assigned to culverts less than 3.0m in height or less than S.Omwidth.

        A 20% blockage factor is considered appropriate given the culvert sizes and site characteristics and has been
        adopted for modelling purposes by Hydrology and Water when undertaking the flood modelling analysis.

        In accordance with best practice, a sensitivity test has also been carried out using a blockage factor of 50% in
        order to gain an understanding of any additional flood risk associated with a higher blockage scenario. This
        sensitivity test is documented in the Hydrology and Water report (2014) titled "Garnet Street Culvert Upgrade
        Hydraulic Assessment".

        Flood Impacts of the Revised Upgrade Design

        As part of the Hydrology and Water report (2014) titled "Garnet Street Culvert Upgrade Hydraulic Assessmen('
        a series of Peak Flood Level Impact maps have been provided for the 2.Year ARI (39% AEP), 10.Year ARI (10%
        AEP) and 100.Year ARI (1% AEP) rainfali events. These maps show the increase and decrease in levels between
        the most recent design scenario and existing scenario.

        Caples of these results are located in Appendix C of the Hydrology and Water report (2014) and a summary
        discussion of these results is provided below.

        o   The upgrade provides a significant improvement to the flood immunity of the Cooroy Creek crossing. The
            current road crossing is un-trafficable in events as frequent as the 2 year ARI, while the revised upgrade
            design wili remain trafficable during events up to the 10 year ARI. Road closure times during large flood
            events will also be significantly   reduced.

        o   The proposed works are predicted to reduce 2 year ARI flood levels upstream of Garnet Street by
            approximately 200mm. Peak 2 year ARI flood leveis immediately downstream of Garnet Street reduce by
            up to 90mm.

        o   The proposed works are predicted to reduce 10 year ARI flood levels upstream of Garnet Street by
            approximately 20 to SOmm. Peak 10 year ARI flood levels immediately downstream of the Garnet Street
            culverts reduce by up to 1oomm. There is also a localised peak flood level impact of approximately
            100mm located over the sporting fields immediately downstream of the proposed western culverts. The
            10 year ARI impact map shows flood level increases over Garnet Street which is due to the proposed
            raising of this road. It is noted that while flood levels over the road have increased, peak fiood depths over
            the road have actually reduced due to the elevated road level.

        o   There are some localised peak flood level impacts for the 100 year ARI event of up to 20mm upstream of
            the Garnet Street road reserve. These impacts are contained over a vacant, low-lying bushland site which
            is already subject to peak 100 year ARI depths in the existing case of generally between 0.5 to 1m. There is
            also a localised peak flood level impact of approximately         180mm located over the sporting fields
            immediately downstream of the proposed western cuiverts.

        o   The upgraded crossing is not predicted to be trafficable for regular vehicles during a 100 year ARt flood
            however, peak depths and velocities over the upgraded crossing during this event are such that it would
            be expected to remain trafficable for emergency vehicles.

        o   The sensitivity testing of the 50% culvert biockage factor predicts that peak 100 year ARI flood levels will
            increase by up to approximately 100mm. Generally speaking, this level of flood level impact is not




                                                                                                                        3

Page 13

     considered to pose a large increase to the flood risk for the area however it is recommended that Noosa
     Council undertake on-going inspection of these culverts and periodic clearing of potential debris upstream
     to minimise the likelihood of this high level of blockage.

Please find enclosed our Application to amend the condition/s     together with the appropriate fee.

Following Council's review of the information,    we would be happy to consult with Council in consideration of
alternate wording of the condition/so

Please do not hesitate to contact the undersigned should you have any queries or require further information.


Regards,


.<              "':\
~Jr(t1!J~
Brad Downes
Urban Engineering      Principal   - Sunshine Coast




                                                                                                                4

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