2021-11-15 GC Agenda - Item 7 - Attachment 1 - Coastal Hazards Adaptation Plan

            Noosa Shire Council




  NOOSAVILLE
  Setting                                                      Appendix 3 shows the change in risk profile
                                                               across various parts of Noosaville as the
  The Noosaville locality is a vibrant urban setting           area exposed to the effects of periodic tidal
  defined by watercourses and bushland edges                   inundation increases over time. Table 19 provides
  including the Noosa River, Eenie Creek, Lake                 a summary of the changing risk profile for six
  Weyba, and Noosa National Park. Noosaville                   broad asset types within the locality that are
  provides much of the commercial, retail,                     projected to be exposed to the effects of periodic
  administrative, industrial and social needs of the           tidal inundation between present day and 2100.
  coastal urban portion of Noosa Shire and is a
  major focus area for visitor accommodation and               The most significant concerns in this locality
  services. The Noosa River foreshore adjacent                 relate to the risks to foreshore parks, given
  to Gympie Terrace is an important recreational               the reliance of locals, visitors and adjacent
  space for the local community and visitors. The              businesses alike on them to create safe and
  area is popular for passive recreation, walking,             attractive places to spend time. Some areas
  dog exercise and access to the Noosa River                   of Quota and Apex Parks can almost certainty
  including ferry stops.                                       expect to be inundated under normal tidal
                                                               conditions to depths of 10cm for at least 1 hr per
  Noosaville is topographically quite flat with much           day for up to 300 days per years. The exposure
  of the locality having an elevation of only a few
                                                               of Council-managed infrastructure, in particular
  meters above present-day high tide levels. For
                                                               the stormwater network, is of significant concern
  this reason, low-lying parts of Noosaville already
                                                               as this network already affected by intrusion of
  see inundation at king tides, and “daylight
                                                               saline tidal waters onto the stormwater pipes. As
  flooding” (due to overflowing stormwater
                                                               sea levels increase, this is expected to occur on
  systems) after heavy rainfall events.
                                                               a daily basis.
                                                               This saltwater intrusion presents two key problems.
  Risks to Noosaville                                          Firstly, the saltwater may damage assets that are
  Significant areas of Noosaville adjacent to the              not expected to be regularly exposed to saltwater
  Noosa River and other waters are considered                  and these waters may lead to sedimentation of
  at high to very high risk from tidal inundation              the network. Secondly, the network is designed
  by the end of the planning period. The low                   to carry a specified volume of overland flows of
  topography of the locality means many assets                 water during rainfall away from developed areas
  are likely to be exposed to frequent inundation.             and into the Noosa River. If the network capacity
  The most prominent of these are publicly owned               is taken up by tidal waters, these overland flows
  assets, namely foreshore recreation areas,                   cannot enter the network and flow out the river,
  the road network (including footpaths) and                   thus potentially leading to some increased flooding
  the gravity-based stormwater network. Some                   in the road network during minor rainfall events.
  residential lots are projected to be partially               From mid-century onwards, it is very likely that
  inundated, though this is unlikely to include                tidal waters may flow back up the network and
  the dwellings themselves, only gardens and                   into the street even under sunny day conditions.
  driveway areas. A small number of tourism and                As a result, both of these scenarios may create
  commercial operations may also be affected by                nuisance and disruption to the community, health
  inundation. Environmental values present across              and safety risks to residents and visitors, as well
  natural foreshore areas of the river39 and the               as possibly leading to minor damage to public and
  conservation parks will be affected.                         private assets.

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       Including Keyser Island, Hay Island, and Ross Island.

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