Redland Bay – Natural Hazards and Critical Infrastructure

Redland Bay – Natural Hazards and Critical Infrastructure

Natural Hazards

To view Natural Hazard mapping layers for bushfire, flood and storm tides, or landslides visit the Redlands Coast Disaster Dashboard.

Bushfire

Large areas of Redland Bay, particularly in the south and west of the suburb are identified as being a high to very high bushfire hazard. The majority of this area is either rural or bushland, characterised with high levels of vegetation and have limited access routes reducing the ability to implement mitigation strategies. Future urban development is planned for this area which lies south of Serpentine Creek Road and will see the rural areas become residential developments. This will result in a large number of residential properties being created closer and closer to these high to very high bushfire hazard areas.

Properties adjacent to bushland areas may be at risk of ember attack should there be a bushfire in the vicinity. During a wildfire, embers can travel up to 3 km in front of a fire line which means residents need to be vigilant and be prepared. For more information about bushfire preparedness and what to do during a bushfire, visit the Queensland Rural Fire Service website to create your Bushfire Survival Plan – PREPARE.ACT.SURVIVE.

Redland City Council employs a range of fire mitigation strategies to reduce the risk of bushfire in the area. These strategies include hazard reduction burning (back burns), fire breaks and weed management. Redland City Council works with its Local Disaster Management Group partners to undertake fire mitigation activities around the city.

Flood Prone, Storm Tide

The Redland Bay area has potential to experience flooding as a consequence of either tidal inundation or flash flooding resulting from heavy rainfall events. Redland Bay has an extensive network of waterways running through it, the largest of these being Weinam Creek which flows into Moreton Bay at the site of the Weinam Creek marina which is a Priority Development Area. Current mapping indicates that Weinam Creek is impacted by both tidal inundation and flash flooding resulting from heavy rainfall events.

There are a number of waterways that run through the residential areas of Redland Bay. Redland Bay has seen a significant level of residential development over the past decade, which is encroaching upon these creek systems which generally flow through bushland reserves around the urban development. What is concerning about these residential developments is that they utilise single road access – one road in, one road out. Previous history has that when School of Arts Road and Serpentine Creek Roads are cut by flash flooding; the entire Torquay Shores community becomes isolated. Redland City Council has since undertaken significant culvert upgrades along School of Arts Road to mitigate against the affects of flash flooding and provide vehicular access to the area.

Current mapping indicates that low lying areas of Redland Bay may experience tidal inundation as a result of a storm tide event. Areas of greatest impact appear to be the Redland Bay Golf Club, the Weinam Creek marina precinct including Banana Street and the Esplanade, Junee Street near Sandy Cove, and heading to the southern end of Redland Bay – properties along Pear Street, Zipfs Road and Rocky Passage Road. At the southern end of Redland Bay, Native Dog Creek flows inland from the Logan River through heavily wooded bushland. Native Dog Creek is impacted by tidal inundation with the potential to cause flash flooding across Serpentine Creek Road, cutting the main road network to Logan City from the southern end of Redland City.

Landslide

Current mapping recognises that Redland Bay has low to high landslide hazard predominantly in the west and south of the suburb as well as along the coastal fringes. The western and southern areas of Redland Bay are typically rural areas with sparse residential development, limiting the potential impacts of landslide. The coastal fringes however have high levels of residential development often where homes have been built atop cliffs that overlook Moreton Bay.

Residential development in these areas needs to comply with the requirements of the Redland Planning Scheme which, through the Landslide Hazard Overlay attempts to mitigate the impacts of the landslide hazard by requiring more robust engineering for developments built within the identified landslide hazard areas. It is important for engineers and geologists to evaluate slope stability and any landslide threat during development assessments so that effective and timely remedial measures can be implemented.

Critical Infrastructure

Critical infrastructure at the time of a disaster event includes utilities such as power, water, sewerage, telecommunications, gas and road and rail networks. Impacts of a disaster on these services may have far-reaching long-term affects for mainland communities.

Sewage

Redland Bay has a mix of sewered and non-sewered areas. The residential areas, located in the north-east of the suburb, are connected to the city’s sewer network. Effluent from these areas is directed to the Victoria Point Sewerage Treatment Plant located off Link Road. Hazard mapping indicates that the Victoria Point Sewerage Treatment Plant is adjacent bushland identified as being moderate bushfire hazard and may be impacted by tidal inundation during a severe storm tide event.

The acreage properties, along with all those properties south of the intersection between Serpentine Creek Road and Cleveland-Redland Bay Road, are not connected to the city’s sewer network. These properties rely on a mix of gravity-fed septic systems and on-site sewerage treatment plants located on the properties to manage the wastewater. The on-site sewerage treatment plants require electricity to function, therefore it is recommended that these systems have a back-up generator to cope with extended periods of power outages which can occur during severe weather events.

Water

Redland Bay receives its water supply from the Heinemann Road Reservoir, located at Mount Cotton. The Heinemann Road Reservoir services the Southern Moreton Bay Islands, Redland Bay, Victoria Point and Thornlands and is connected to the Mount Cotton Reservoir at Tallow Wood Court, Mount Cotton, which services Mount Cotton and Sheldon. The Mount Cotton Reservoir in turn is connected to the Alexandra Hills Reservoir located at Hilltop Circuit at Alexandra Hills, making possible the supply of water to Redland City’s northern suburbs should there be issues with Leslie Harrison Dam, which traditionally services the north of the city.

The Heinemann Road Reservoir is also connected to the Herring Lagoon bore field on North Stradbroke Island and the South East Queensland Water Grid via a pump station on Gramzow Road, Mount Cotton. The connection to the South East Queensland Water Grid allows water to be pumped to and from the city via the Heinemann Road Reservoir. This network of reservoirs, pump stations and pipelines ensures that water can be moved around the network and that multiple water supplies are available to residents living in all areas Redland City.

Electricity

Redland Bay is serviced by a mix of both overhead and underground powerline networks. Redland Bay has experienced a large growth in urban development in recent years and as such, the majority of residential areas are services by the underground powerline network. However, there are pockets in the north around the village centre and in the south, particularly in the rural areas that are still serviced by overhead powerlines.

The overhead powerlines are more susceptible to damage during severe weather which can result in power outages and fallen powerlines. Fallen powerlines can cause significant dangers to the community, be aware that any object in contact with powerlines could be live. The area is more dangerous in wet conditions as water is an excellent conductor.

Remember: any metallic objects, including fences, will be electrified if they touch or are even close to a live fallen powerline. Even a tree branch can be a potential conductor of electricity if it is in contact with a live wire. Stay away from fallen powerlines and alert others of the danger – contact Energex on 000 or 13 19 62.

Gas

There is no domestic reticulated gas service within Redland City and no gas main that runs through the suburb of Redland Bay. There are however homes within the area that use gas bottles the service hot water systems and cooking appliances. Residents are reminded to be diligent with the appropriate storage and maintenance of any gas bottles that they have located on their property.

Telecommunications

Redland Bay is connected via landlines to the telecommunications and data networks. There is generally good mobile network coverage in Redland Bay, due to the terrain and remoteness of the far southern end of Redland Bay, there may be mobile reception black spots in the area. Telstra is the major supplier of telecommunications to the region; other suppliers include Optus and Vodafone.

Harbours and Marinas

The Weinam Creek Marina facility at Redland Bay is a critical piece of marine infrastructure for Redland City. The marina precinct is considered to be the gateway to the Southern Moreton Bay Islands, with plans for the precinct to become an exciting and dynamic destination in its own right – as well as an effective transport hub and gateway to the islands. For further details please go to Council’s website.

The Weinam Creek marina precinct currently incorporates passenger ferry and barge services to the Southern Moreton Bay Islands, short and long term marina births, boat launching area and is home to emergency service infrastructure such as the Redland Bay Water Police barge, Redland Bay Coastguard Head Quarters and the Redland Bay SES flood boat. Current flood prone, storm tide mapping indicates that the Weinam Creek marina precinct may be impacted by tidal inundation during an extreme storm tide event that could result in damage to essential infrastructure.

There are also a number of small boat moorings dotted along the Redland Bay coast line. These moorings and vessels are at risk of structural damage should a storm tide event impact the area.

Road Network

REMEMBER: If it’s flooded, forget it – BACK IT UP!

Summer months bring rain, cyclones and unstable weather conditions to Queensland. More than half of flood related deaths in Queensland are the result of people driving through floodwater. It can happen anywhere – roads, creeks, dams, parks or backyards. Residents should be aware of the dangers connected to floodwater or swift flowing water such as: slippery surfaces; uneven ground; strong currents; sharp objects; electrical current; fences; vehicles; rocks; long grass; tree branches; sewerage; and chemicals.

If you get trapped in floodwater, you not only put your life and the lives of the people with you at risk, but you also put the lives of the rescuers at risk too.

Localised flooding may temporarily restrict access and cut roads in some areas of Redland City. Please consider this when planning to drive during periods of heavy rain. See a list of the areas that may be impacted by localised flooding.

Don’t wait until it’s too late. Plan ahead and keep yourself, family and friends safe. Check out the Queensland Government’s ‘Back it Up’ initiative for more information.

Rail Network

Currently there is no rail infrastructure in Redland Bay and there are no plans to extend to rail network to Redland Bay in the near future.

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