Capalaba – Natural Hazards and Critical Infrastructure

Capalaba – Natural Hazards and Critical Infrastructure

Natural Hazards

Bushfire

Capalaba has a number of large pockets of high to very high bushfire hazard spread throughout the suburb. These bushfire hazard areas appear in the south and west of the suburb which is dominated by smaller acreage properties bordering residential estates, along with sections of high to very high bushfire hazard located in the heavily developed residential areas of Koala Park and Maridale Park to the east of Ney Road. There is also a section of high to very high bushfire hazard that surrounds the Capalaba Waste Water Treatment Plant and backs onto the residential area of Crotona Road and Crotona Road East.

Properties adjacent bushland areas may be at risk of ember attack should there be a bushfire in the vicinity. During a wild fire, embers can travel up to 3 kilometres 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  and download the 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 is also investigating arrangements with Queensland Fire and Emergency Services to support fire mitigation activities around the city.

Download the Capalaba Bushfire Prone Map.

Flood Prone, Storm Tide

Capalaba has a number of waterways running through the suburb, the largest of which is the Leslie Harrison Dam located on the Tingalpa Creek. Current Storm Tide, Flood Prone mapping indicates that the Capalaba Regional Park and the sports fields along Old Cleveland Road are susceptible to flooding during heavy rain events and storm tide. Likewise, flooding would also occur in these areas should there be a large release of water from the Leslie Harrison Dam.

To reduce the potential impacts of releases from the Leslie Harrison Dam, Redland City Council in partnership with SEQ Water has devised a strategy of trickle flow releases to coincide with tide times prior to the dam reaching maximum capacity. SEQ Water has developed a comprehensive Emergency Action Plan for the Leslie Harrison Dam to meet the requirements of the Water Supply (Safety and Reliability) Act 2008 in order to manage any crisis or dam failure.

Download the Capalaba Flood Prone, Storm Tide Overlay

Landslide

Landslide Hazard mapping indicates Capalaba has a very limited risk of landslide with a small area of low to medium landslide hazard being identified around the Howletts Road and Allambee Crescent area which backs onto the Leslie Harrison Dam. Acreage properties are prominent in this area with sparse residential development which limits the potential impacts of landslide. Furthermore, the Redland Planning Scheme, 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.

Download the Capalaba Planning Scheme, Landslide Hazard Overlay.

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

Capalaba’s long established residential areas are connected to the sewer network, however the acreage properties located in the south and west of the suburb are not sewered and 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.
Capalaba’s sewer network connects to the Capalaba Sewerage Treatment Plant which is located behind Crotona Road and is surrounded by bushland identified as being a high bushfire hazard.

Water

Capalaba receives its water supply from the Alexandra Hills Reservoir located at Hilltop Circuit, Alexandra Hills. The Alexandra Hills Reservoir services the Redland City’s northern suburbs via a pipeline network that is both gravity fed and pressurised. The reservoir holds a mix of water from the Leslie Harrison Dam and the Herring Lagoon bore field on North Stradbroke Island.

This is possible because the Alexandra Hills Reservoir connects to both the Leslie Harrison Dam and the Mt Cotton Reservoir at Tallow Wood Court, Mt Cotton. The Mt Cotton Reservoir is in turn connected to the Heinemann Road Reservoir, Mt Cotton which connects to both the South East Queensland Grid and North Stradbroke Island. Redland City is connected to the South East Queensland Water Grid via a pump station on Gramzow Road, Mt Cotton which allows water to be pumped to and from the city via the Heinemann Road Reservoir, Mt Cotton. 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

Running through the bushland area toward the southern end of Capalaba is the main power supply to Cleveland which is carried on an 110Kv overhead powerline network. This network utilises steel towers within a maintained corridor to mitigate the risks posed by natural disasters such as fire and flood.

The majority of Capalaba has been long established and as such is serviced by an overhead powerline network. Overhead powerlines are more susceptible to damage during severe weather which can result in power outages and fallen powerlines. Fallen powerlines oppose 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 13 19 62.

Gas

Capalaba has a pressurised gas main that runs along Old Cleveland Road, Finucane Road and Redland Bay Road. This gas main is used by commercial enterprises and services the Capalaba business district along Redland Bay Road and the Capalaba Park and Capalaba Central Shopping Centres.
There is no domestic reticulated gas service within Redland City, however there are homes within the area that use gas bottles to service hot water systems and cooking appliances. Residents are reminded to diligent with the appropriate storage and maintenance of any gas bottles that they have located on their property.

Telecommunications

Capalaba is connected via landlines to the telecommunications and data networks. There is good mobile network coverage in Capalaba with limited to no mobile reception black spots in the area. Telstra is the major supplier of telecommunications to the region; other suppliers include Optus and Vodafone.

Road Network

REMEMBER: If it’s flooded, forget it!

On 20 November 2012, Iain MacKenzie – Inspector General Emergency Management said “There is absolutely no excuse for motorists who deliberately drive or walk past a road closed sign and into floodwaters. Even if you are in familiar territory and believe local knowledge will get you through, think again. Floodwaters are treacherous and the dangers are hidden beneath the surface.”

Every year people are hurt, or die, trying to cross or play in flooded waterways. 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. A list of the areas impacted by localised flooding can be found here.

Rail Network

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