Change to Existing Approval - OPW11/0116.01

NOTES


1   .   Design conditions
    1.1.    Tides [OTtide tables, Noosa Head]
                                     AHD           LAT
                HAT              +1.06m           +2.18m
                                                                                                                         Sand-filled Geotextile Containers
                MHWS             +O.62m           +1.74m                                                                 Finished dimensions
                AHD              +O.OOm           +1.12m
                                                                                                                         [Filled above water level]
                MLWS             -O.80m           +O.32m
                LAT              -1.12m           +O.OOm
    1.2.     Flood [Noosa River Flood Study, John Wilson & Partners, 1995]
                50yr ARI          1 .44mAHD                                                                                                                      3.8m
                entrance scour             O.5m
                                                                                                                                                             I          I          NOTES

                                                                                                                           Nominal Diameter = 3.0m

                                                                                                                                                             T1 ~I1.3m
                                                                                                                                                             (
    1.3.     Currents [GCCM numerical model]
                                                                                                                           Volume = 81 m3
                Max spring tide            1 -1.5m/s.
                Velocities expected to vary in response to prevailing channel configurations and location within
                the estuary.
    1.4.     Waves
                Hs                         1 m [nominal]                                                                                                         4m

                Potential wave conditions at the foreshore are expected to vary in

                response to prevailing channel configurations.


2.      Materials   -
                        Geotextile and Sand-filled Geotextile Mega-Containers
                                                                                                                           Nominal Diameter = 3.4m

                                                                                                                           Volume = 103m3                    C T2 ~l5m
    2.1.     Containers to be fabricated using ELCOMax 1209RP geotextile (or equivalent).         Expected lifetime
             25 years.
    2.2.     Container length to be 20m [may be altered if necessary or preferred by contractor].
    2.3.     Containers to have suitably spaced filling ports [MIN 3 preferred] with "screw & glue" closure types.
                                                                                                                                                                 5m
    2.4.     Geotextile underlay to be ELCOMax 600R (or equivalent)
    2.5.     Geotextile flaps, where required, are to be of sufficient size to provide a 30m x 6m flap.   Flaps are to


    2.6.
             be fabricated using ELCOMax 600R (or equivalent). Flaps are to be adequately secured (e.g.
             stiched) to the bottom of the container.
             If flaps cannot be fabricated, may be replaced with separate geotextile fabric with 1 m laps.
                                                                                                                            Nominal Diameter = 4.2m

                                                                                                                            Volume = 183m3                   ( JI20m
                                                                                                                                                                 T3

3.      Filling of Containers
    3.1.     Excavation tolerances                                                                                                                                6m
                Vertical         +/- O.2m
    3.2.     Containers to be filled in accordance with manufacturer’s specifications using either jetpump, dredge


    3.3.
    3.4.
             or suitable alternative.

             Design filled container dimensions as shown.
             Finished container tolerances
                Horizontal       +1- 1.0m from design alignment [containers to be well butted together]
                                                                                                                            Nominal Diameter = 4.6m

                                                                                                                            Volume = 224m3                   ( j}2m
                                                                                                                                                                 T4
                                                                                                                                                                                   LEGEND




                Vertical         +/- O.5m at any single point
                                 +/- O.3m averaged over 10m


4.      Maintenance
    4.1.     Nominated geotextile is more robust than the standard geotextile, however may be subject to                 Sand-filled Geotextile Containers
                                                                                                                         Finished dimensions
             damage from vandalism, vessel impact, anchors etc.                                                                                                   6m
    4.2.     Structures to be inspected periodically and after all major events.                                         [Filled below water level]
    4.3.     Any minor damage is to be repaired as soon as practicable.
    4.4.     Any major damage or deflation and the container is to be replaced.




5.
    4.5.


    4.6.
             If damage is an ongoing concern, consideration may need to be given to armouring the structures
             [e.g. with rock].
             Scour may require topping up with additional containers or placing of rock in scour holes


        Monitoring
                                                                                                                            Nominal Diameter      =   4.6m

                                                                                                                                                             C   T4
                                                                                                                                                                            J}6m                                 International

    5.1.     The natural system is highly variable.                                                                                                              6m
                                                                                                                                                                                                                Coastal
                                                    Monitoring is to be undertaken in accordance with ICM Report
             "Option Review Noosa River Spit" to determine the performance and impacts of the works.
                                 -
                                                                                                                                                                                                                Management
    5.2.     Works may be modified or removed if monitoring indicates that this is necessary.                                                                                         ~5:JIGA-T!\SfCr.mn._Beo:!\4217.OLD.""’rala

    5.3.     Implementation of later stages of the works to be undertaken as required.                                              Flap Detail
                                                                                                                                                                 T4
                                                                                                                                                                             }6m      .EQ2!. PO Box.Jh, MalnBe LPO, Marc Beach 01..0, 421/, Australia
                                                                                                                                                                                      TELEPHONE <b1 f_
                                                                                                                                                                                      ~wwwcoastamaregemer1

                                                                                                                                                                                   PROJECT NAt’




                                                                                                                                                                                   DRAWNG TIlLE
                                                                                                                                                                                                  NOOSA RIVER SPIT



                                                                                                                                                                                                             NOTES
                                                                                                                                                                                                                        F/’O(
                                                                                                                                                                                                                            au
                                                                                                                                                                                                                                <61 f;oJ:14f