MCU25 0087 - Reference Document - Coastal Hazard Assessment (As Published)

                                     Erosion Prone Area
                              Noosa Shire Local Government Area


           Erosion Prone Area Definition
           1.   Erosion prone areas are deemed to exist over all tidal water to the extent of Queensland Coastal Waters and on all land
                adjacent to tidal water.
           2.   Erosion prone areas include areas subject to inundation by the highest astronomical tides (HAT) by the year 2100 or at
                risk from sea erosion.
           3.   On land adjacent to tidal water the landward boundary of the erosion prone area shall be defined by whichever of the
                following methods gives the greater erosion prone area width:
                a.       a line measured 40 metres landward of the plan position of the present day HAT level except where approved
                         revetments exist in which case the line is measured 10 metres landward of the upper seaward edge of the
                         revetment, irrespective of the presence of outcropping bedrock;
                b.       a line located by the linear distance shown on Table 1 and measured, unless specified otherwise, inland from:
                       i.     the seaward toe of the frontal dune (the seaward toe of the frontal dune is normally approximated by the
                              seaward limit of terrestrial vegetation or, where this cannot be determined, the level of present day HAT); or
                      ii.     a straight line drawn across the mouth of a waterway between the alignment of the seaward toe of the frontal
                              dune on either side of the mouth
                c.       the plan position of the level of HAT plus 0.8 m vertical elevation.

                Except:
                  i. where the linear distance specified in 3b is less than 40 metres, in which case section 3a. does not apply and the
                     erosion prone area width will be the greater of 3b and 3c; or
                 ii. where outcropping bedrock is present and no approved revetments exist, in which case the line is defined as being
                     coincident with the most seaward bedrock outcrop at the plan position of present day HAT plus 0.8m; or
                iii. in approved canals in which case the line of present day HAT applies, irrespective of the presence of approved
                     revetments or outcropping bedrock.

           4.   Erosion prone areas defined in accordance with the above are deemed to exist throughout all the local government
                areas, irrespective of whether the entire local government area is depicted on erosion prone area plans for the area.



           Notes to clarify the definition
           1.   The specific location along the coast to which each erosion prone area linear distance applies (a segment) is shown in
                Table 1.
           2.   A map indicating the approximate location along the coast of each linear distance segment is attached.
           3.   Each erosion prone area segment is located on the coastline between 2 points defined by latitude and longitude. A
                projection of each point to the nearest actual coastline and continuing inland perpendicular to the coast defines the
                erosion prone area segment.
           4.   “Present day HAT” in the definition is always taken to be the present day level of HAT for the coastline as defined in the
                Queensland Tide Tables for that year or as defined by empirical methodology at the site.
           5.   The extent of the erosion prone area where it is defined by “HAT plus 0.8m” is the HAT coastline at the year 2100 and
                includes sea level rise to that time. It is determined by the area of land inundated to the level HAT of the nearest
                adjacent open coast or river tide gauge plus 0.8m vertical elevation. Site based HAT is not to be used as present day
                attenuation of inland HAT level due to flow constraints may not persist to 2100 with coastline response to sea level rise.
                For further explanation see the Coastal Hazard Technical Guide.
           6.   Where noted on Table 1 (and the map) the specified linear distance applies except where a revetment has been
                constructed and maintained to the approved design in which case the landward boundary of the erosion prone area is at
                the upper seaward edge of the revetment (A-line).
           7.   The approximate erosion prone area footprint is shown on Coastal Hazard Area Maps available on the Department of
                Environment and Heritage Protection website at www.ehp.qld.gov.au. These footprints are indicative only and the
                definition in this plan prevails for any inconsistency between the two.
           8.   This erosion prone area plan may be updated from time to time and a new revision created. Please check with the
                Department of Environment and Heritage Protection or the local government that this copy is the current version prior to
                using the contained information in any way.



           Date of Erosion Prone Area Declaration: 8 July 2015                                                    Plan No:
           Date of Erosion Prone Area Amendment:                                                                  NOS3A


Document Set ID: 24631530
Version: 1, Version Date: 24/03/2026