PO1

Development:

1. does not provide unacceptable risks to people, property or the environment from flood hazard impacts or, the risks are mitigated to an acceptable or tolerable level, or
2. does not intensify an existing use in flood hazard area in order to avoid risks to people, property or the environment or the risks are mitigated to an acceptable or tolerable level.

Note—The terms 'acceptable risk' and 'tolerable risk' are defined in State Planning Policy Guideline – Guidance on flood, bushfire and landslide hazards. The National Construction Code, Building Regulation 2006 and the Queensland Development Code Mandatory Part 3.5 may also establish requirements with which development will need to comply.

AO1

Development, including intensification of an existing use, does not occur on land within a flood hazard area.

OR

A site specific flood hazard assessment demonstrates that risks associated with the development can be mitigated to an acceptable or tolerable level.

OR

If the premises is located in a Flood Hazard Investigation Area in the Flood Hazard overlay mapping, a written notice issued by Council at its sole discretion, for the purposes of this acceptable outcome, confirms that it is satisfied that the performance outcome PO1 would be achieved without the need for a site specific flood hazard assessment and/or a Registered Professional Engineer of Queensland certifying the actual level of flood risk for the site and measures required to ensure the risk associated with the development can be mitigated to an acceptable or tolerable level.

Note - In exercising its discretion, Gladstone Regional Council may, without limitation, have regard to: 

• the location and characteristics of the site any existing flood studies or work being carried out in the course of undertaking flood studies which may be relevant to the site
• any work undertaken by or on behalf of Gladstone Regional Council in the course of locally verifying the extent of flood hazards which may be relevant to the site.

Note—AS/NZ ISO 31000:2009 Risk management – Principles and guidelines provides guidance on identifying and managing risks. Table 8.2.7.3.3—Table to acceptable outcomes sets out the criteria for establishing the level of flood hazard. A Registered Professional Engineer of Queensland with expertise in undertaking risk and flood analysis is to certify the actual level of flood risk for the site and measures required to ensure the risk associated with the development can be mitigated to an acceptable or tolerable level.

PO2

Development is sited to enable safe evacuation in the event of a flood.

AO2

Development has direct access to land above the DFE by an evacuation route that is either above the DFE or has a confirmed low or medium flood hazard rating. Evacuation routes do not include an high or extreme flood hazard area.

OR

If the premises is located in a Flood Hazard Investigation Area in the Flood Hazard overlay mapping, a written notice issued by Council at its sole discretion, for the purposes of this acceptable outcome, confirms that it is satisfied that the performance outcome PO1 would be achieved without the need for a site specific flood hazard assessment and/or a Registered Professional Engineer of Queensland certifying the actual level of flood risk for the site and measures required to ensure the risk associated with the development can be mitigated to an acceptable or tolerable level.

Note - In exercising its discretion, Gladstone Regional Council may, without limitation, have regard to:

• the location and characteristics of the site any existing flood studies or work being carried out in the course of undertaking flood studies which may be relevant to the site
• any work undertaken by or on behalf of Gladstone Regional Council in the course of locally verifying the extent of flood hazards which may be relevant to the site.

Note—The criteria for a low or medium flood hazard is defined in Table 8.2.7.3.3—Table to acceptable outcomes. A Registered Professional Engineer of Queensland with expertise in undertaking flood analysis is to certify the actual level of risk for the site in accordance with those criteria.

PO3

Signage is provided within extreme, high and medium flood hazard areas to alert residents and visitors to the flood hazard.

AO3

Signage is provided on site (regardless of whether the land is in public or private ownership) indicating:

1. the position and path of all safe evacuation routes off the site, and
2. if the site contains or is within 100m of a floodable waterway, hazard warning signage and depth indicators are also provided at key hazard points such as floodway crossings or entrances to low–lying reserves.

If the premises is located in a Flood Hazard Investigation Area in the Flood Hazard overlay mapping, a written notice issued by Gladstone Regional Council at its sole discretion, may for the purposes of this acceptable outcome, exempt compliance with AO3(a).

Note - In exercising its discretion, Gladstone Regional Council may, without limitation, have regard to: 

• the location and characteristics of the site
• any existing flood studies or work being carried out in the course of undertaking flood studies which may be relevant to the site
• any work undertaken by or on behalf of Gladstone Regional Council in the course of locally verifying the extent of flood hazards which may be relevant to the site.

PO4

Reconfiguring a lot other than in a residential zone allows sufficient area and access for the intended use.

AO4.1

For new lots in the rural zone or rural residential zone, a designated building envelope, generally rectangular in shape, having a minimum area of 1,000m2 and a finished surface level of not less than 1,000mm above the DFE is provided.              

AO4.2

Access from the building envelop to the evacuation route is located above 5% AEP flood immunity level and has a low or medium hazard rating a per Table 8.2.7.3.3.

Notes—Table 8.2.7.3.3—Table to acceptable outcomes sets out the criteria for establishing the level of hazard. A Registered Professional Engineer of Queensland with expertise in undertaking flood analysis is to certify the actual level of risk for the site in accordance with those criteria.

PO5

Road and pathway layout ensures residents are not physically isolated from adjacent flood free urban areas and provides a safe and clear evacuation route path.

AO5.1

New arterial roads are located above the DFE, sub–arterial and collector roads are located above the 2% AEP flood level and all other roads are above the 5% AEP flood level.

AO5.2

Development does not involve cul–de–sacs or dead end streets within a flood hazard area.

AO5.3

Each new lot has direct access to low or medium hazard evacuation routes as defined in Table 8.2.7.3.3—Table to acceptable outcomes.

Note—The criteria for a low or medium flood hazard is defined in Table 8.2.7.3.3—Table to acceptable outcomes.

PO6

The floor levels of residential uses and other sensitive uses are raised above the DFE to provide an allowance above the main floodway for hydraulic gradient and wave action.

AO6.1

Habitable rooms have a minimum floor level at least 1000mm above the DFE.

OR

Where involving an extension to an existing residential use that has habitable rooms below the DFE, any extension does not exceed 25m2 GFA.

AO6.2

Floor levels of non–habitable rooms (other than Class 10 buildings) are above the DFE, or allow for the flow through of floodwaters.

AO6.3

Where a building has been destroyed by flood, the floor levels of the reconstructed building accord with AO7.1 and AO7.2.

AO6.4​

The filling height of building footprints does not exceed 1000mm and has batters not steeper than 1 in 6.

PO7

Non–residential development is designed and located to minimise damage to property from flooding impacts.

AO7.1

The floor level of non–residential buildings (other than Class 10 buildings) is above the DFE or allows for the flow through of floodwaters on the ground floor.

AO7.2

Where located less than 1000mm above the DFE materials stored on–site are those that are easily able to be moved off–site in a flood event.

PO8

Development, including any earthworks or excavation work in excess of 50 cubic metres, must:

1. not adversely impact on or change the flood characteristics of a floodplain or waterway
2. not reduce existing flood storage and flow capacity
3. avoid any physical change to a floodplain or natural waterway
4. avoid increased scour and erosion
5. not increase the depth, velocity or direction of the flow, the rate of flood level rise or the duration of inundation on land external to the site, and
6. not substantially remove any riparian or riverine vegetation.

PO9

Public safety and the environment are not adversely affected by the impacts of floodwater on hazardous materials manufactured or stored in bulk.

AO9.1

Development does not involve the manufacture or storage of hazardous materials within a flood hazard area.

OR

A site specific flood hazard assessment demonstrates that the site is within a low or medium hazard, the manufacture or storage of hazardous materials takes place not less than 1000mm above the DFE flood levels.

AO9.2

Structures used for the manufacture or storage of hazardous material in bulk are designed to prevent the intrusion of floodwaters.

OR

AO9.3

Within the low or medium flood hazard area, the quantity of hazardous chemicals is:

1. flammable gases less than 5,000L
2. toxic gases less than 500L
3. non–toxic, non–flammable gases including oxidising gases less than 10,000L
4. classes 3, 4, 5, 6.1, 8 and 9 of packing group I less than 500L or kg of the ADG code
5. classes 3, 4, 5, 6.1, 8 and 9 of packing group II less than 2,500L or kg of the ADG code, or
6. classes 3, 4, 5, 6.1, 8 and 9 of packing group III less than 10,000L or kg of the ADG code.

Notes—Table 8.2.7.3.3—Table to acceptable outcomes sets out the criteria for establishing the level of hazard. A Registered Professional Engineer of Queensland with expertise in undertaking flood analysis is to certify the actual level of risk for the site in accordance with those criteria.

PO10

The use of land for intensive animal husbandry does not establish or intensify in a flood hazard area, in order to avoid risk to the environment.

AO10

Intensive animal husbandry, including the storage of bulk food and any associated water treatment facilities, does not occur on land below the DFE.

PO11

Community infrastructure is able to function effectively during and immediately after flood events.

AO11

Community infrastructure is provided at or above the recommended flood immunity level specified in Table 8.2.7.3.2—Recommended flood immunity levels for community infrastructure.

PO12

Essential services infrastructure (e.g. gas, water supply, sewerage, telecommunications, and on–site electricity,) maintains its function during and immediately after a DFE flood event.

AO12

Any components of infrastructure that are likely to fail to function or may result in contamination when inundated by flood water (e.g. electrical switchgear and motors, water supply pipeline air valves) are:

1. located above the DFE, or
2. designed, sited and operated to prevent floodwater intrusion/infiltration.

PO13

Infrastructure is designed, sited and operated to resist hydrostatic and hydrodynamic forces as a result of inundation by a DFE.

Emergency services 0.2% AEP

Emergency shelters 0.5% AEP

Police facilities 0.5% AEP

Power stations 0.2% AEP

Major switch yards 0.2% AEP

Substations 0.5% AEP

Timing

Note—This category cannot be implemented until evacuation times have been established in the Counter Disaster Plan (flooding).