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Kilcoy Solar Farm ‘High-Level’ Flood Hazard Assessment

Reference: R.B22885.001.02.Flooding.docx Date: April 2018 Confidential

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BMT WBM Pty Ltd Level 8, 200 Creek Street Brisbane Qld 4000 Australia PO Box 203, Spring Hill 4004 Tel: +61 7 3831 6744 Fax: + 61 7 3832 3627 ABN 54 010 830 421 www.bmt.org

Document: R.B22885.001.02.Flooding.docx

Title: Kilcoy Solar Farm ‘High-Level’ Flood Hazard Assessment

Project Manager: Anne Kolega

Author: Anne Kolega

Client: Ethos Urban

Client Contact: Morgan Randle

Client Reference:

Synopsis: This report presents a high-level Flood Hazard Assessment for the proposed Kilcoy Solar Farm development.

REVISION/CHECKING HISTORY

Revision Number Date Checked by Issued by

0 07/02/2018 S Wallace A Kolega

RPEQ (18217)

1 19/04/2018 S Wallace A Kolega

RPEQ (18217)

2 23/04/2018 S Wallace

A Kolega

RPEQ (18217)

DISTRIBUTION

Destination Revision

0 1 2 3 4 5 6 7 8 9 10

Ethos Urban

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Kilcoy Solar Farm ‘High-Level’ Flood Hazard Assessment I

Executive Summary


Executive Summary

BMT has been commissioned by Ethos Urban to undertake a ‘high-level’ assessment of flood hazard for the

proposed Renewable Energy Facility (Solar Farm) development, located approximately 10 km west of Kilcoy.

This advice focuses on Somerset Regional Council’s Planning Scheme, in particular the Flood Hazard Overlay

Code and the associated Flood Hazard Overlay Map – OM007a.

A review of the proposed development, as described in this report was undertaken to assess the potential of

an increase in flood hazard from the development.

The proposed development is not expected to impact existing flood hazard based on the following:

• No ground treatment, filling or excavation is proposed within the Potential Flood Hazard Area.

• The staff parking, amenities, substation and battery storage facility is expected to be located outside the

Potential Flood Hazard Area.

• The proposed development does not include internal roads.

• The 30-60 permanent on site staff will be located outside the Potential Flood Hazard Area. Road access to

buildings above the level of the 1% AEP flood level is to be provided for permanent on site staff.

• Limited equipment (subarrays on posts with diameter approximately 0.3m) will be located within the

Potential Flood Hazard Area.

Access to and from the Site may be affected by flooding because the proposed access is via Holland Road,

which traverses the Potential Flood Hazard Area.

The proposed design should consider the potential for damage of subarrays and scour of the posts located

within the Potential Flood Hazard Area.

Kilcoy Solar Farm ‘High-Level’ Flood Hazard Assessment II

Contents


Contents

Executive Summary i

1 Introduction 1

1.1 Background 1

1.2 Scope of Report 1

2 Proposed Development 2

2.1 Location 2

2.2 Proposed Development 2

3 Flood Hazard Overlay Code Criteria 4

3.1 Flood Hazard Overlay Code Details 4

3.2 Access, Damage and Scour 6

4 Summary 7

5 References 8

Proposed Development and Layout A-1

Flood Hazard Overlay Code B-1

Flood Hazard Overlay Map C-1

List of Figures

Figure 2-1 Location of Site and Potential Flood Hazard Area 3

List of Tables

Table 3-1 Flood Hazard Code Summary 4

Kilcoy Solar Farm ‘High-Level’ Flood Hazard Assessment 1

Introduction


1 Introduction

1.1 Background

This ‘high-level’ assessment of flood hazard has been undertaken by BMT for Ethos Urban, to

support a development application for a renewable energy facility (solar farm) located approximately

10 km west of Kilcoy (hereafter referred to as ‘the site’). In summary, the proposed solar farm

comprises:

• three 500 MW energy facilities, with stage one constructing two facilities and stage two

constructing the third facility,

• approximately 1.73 million solar panels required for each energy facility (approximately 5.19

million panels in total),

• solar panels arranged in subarrays of 21 solar panels in a 3 x 7 formation, and

• 125 battery module containers, each container storing 4 MW.

1.2 Scope of Report

This report is based on a high-level desktop assessment of flood hazard for the site. No modelling

has been undertaken as part of this scope of works. Approximately 2.88 km² (14% of the site) is

located with the ‘Potential Flood Hazard Zone’, as described in Somerset Regional Council’s Flood

Hazard Overlay Map – OM007a. It is understood that the Potential Flood Hazard Area is a spatial

extent of where flooding has previously occurred, or has the potential to occur. It is not based on

flood modelling and does not represent a particular historical or design flood event.


Proposed Development


2 Proposed Development

2.1 Location

The site (centroid) is located approximately 15 km west of Kilcoy, and is broadly bounded to the north

by D’Aguilar Highway, to the west by Brisbane Valley Highway and to the east by Esk-Kilcoy Road.

The location of the site and the Potential Flood Hazard Area as per Flood Hazard Overlay Map –

OM007a are presented in Appendix C.

2.2 Proposed Development

The basic development details and the proposed layout1, are presented in Appendix A.

The following key points are of relevance to flood hazard:

• No surface treatment is required.

• A fixed structure single post ground mounting system will be used for each subarray with a

diameter of approximately 0.3m.

• The ground will not be treated under the solar panels (it is understood that no filling and no

excavation is proposed at the solar panels)

• The staff parking, amenities, substation and battery storage facility is expected to be located

outside the Potential Flood Hazard Area.

• Road access to buildings above the level of the 1% AEP flood level is to be provided for

permanent on site staff.

• Battery storage:

○ No specific ground treatment is required for the batteries; except for applying gravel. The

batteries are likely to be stored on gravel

○ Approximately 48,562m² of area will be required for battery storage. The proposed battery

storage location is outside the Potential Flood Hazard Area, as shown in Appendix A.

○ Transport of batteries offsite will be infrequent

• The main access to the site will be off Holland Road

• No internal roads will be constructed.

1 Provided by Ethos Urban on 18 April 2018


Flood Hazard Overlay Code Criteria


3 Flood Hazard Overlay Code Criteria

3.1 Flood Hazard Overlay Code Details

Approximately 14% of the proposed solar farm is located within the Potential Flood Hazard Area,

shown in the Flood Hazard Overlay Map – OM007a. The Flood Hazard Code was reviewed in regard

to the proposed development. The relevant performance and acceptable outcomes from the Flood

Hazard Overlay Code are tabulated in Table 3-1 with commentary relating to the proposed

development.

Table 3-1 Flood Hazard Code Summary

Performance outcomes Acceptable outcomes Commentary relating to Proposed Development

Significant flood hazard area, Low flood hazard area or Potential flood hazard area

PO13 Development is located and designed to:

(a) maintain hydrological function of

the premises;

(b) not increase the number of people

calculated to be at risk from

flooding;

(c) minimises the flood impact on

adjoining premises;

(d) ensure the safety of all persons by

ensuring that a proportion of

buildings are set above the defined

flood level;

(e) reduce the carriage of debris in

flood waters;

(f) reduce property damage; and

(g) provide road access to buildings

above the level of the 1% AEP

flood level.

Note- where the development is located in a Potential flood hazard area as identified on Flood Hazard Overlay Map OM-007, and there is no defined flood level, a hydraulic (flood hazard assessment) report prepared by a RPEQ is required in substantiation of a Performance Solution. Alternatively, the defined flood level from an adjacent representative hazard area may be used if deemed appropriate by Council.

Where for Material Change of Use or Building Work AO13.1 Buildings, including extensions to existing buildings are:

(a) elevated above the defined

flood level; and

(b) and the defined flood event

does not exceed a depth of

600mm.

OR AO13.2 Where for business activities or industry activities buildings the minimum floor level supporting the following elements of the development must be located above the defined flood level:

(a) administrative areas;

(b) services, plant and equipment

associated with the building.

Editor’s Note- AO13.2 accepts that the cost of flood impact is an operational cost of the business activity or industry activity. Editor’s Note: Businesses should ensure that they have the necessary continuity plans in place to account for the potential need to relocate property prior to a flood event (e.g. allow enough time to transfer stock to the upstairs level of a building or off site).

Editor’s Note: The relevant building assessment provisions under the Building Act 1975 apply to all building work within the Flood Hazard Area

Complies with PO13

Except for solar panels and part of the access road, the buildings and structures for the project are located outside of the Potential Flood Hazard Area shown on the Flood Hazard Overlay Map OM-007.

Solar panels will be fixed by a single post ground mounting system with a diameter 0.3m, without further treatment, and will be designed to withstand hydraulic forces of any flood event through the area.

The staff parking, amenities, substations and battery storage facilities are located outside the Potential Flood Hazard Area.

Ensure that access to

buildings are provided above

the level of the 1% AEP

flood level. Then, there is a

low risk, on site staff

becoming exposed to flood

risk or cut-off during the 1%

AEP flood event.





and need to take account of the flood potential within the area.

AO13.3 Where the defined flood level is known, new buildings are:

(a) located on the highest part of

the site to minimise entrance

of floodwaters; and

(b) provided with pedestrian and

vehicle evacuation access

between the building and a

road that is above the 1%

AEP flood level.

AO13.4 Where the defined flood level is not known, new buildings are:

(a) located on the highest part of

the site to minimise entrance

of floodwaters; and

provided with clear and direct pedestrian and vehicle evacuation access.

AO13.5

Where for accommodation activities, the design and layout of buildings minimises risk from flooding to an acceptable or tolerable level by providing parking and other non-habitable uses at ground level.

Where for Reconfiguring a Lot AO13.6

Additional lots, except where for the purposes of public open space:

(a) are not located in areas of Significant flood hazard area, Low flood hazard area or Potential flood hazard area as identified on Flood Hazard Overlay Map OM-007 ; or

(b) are demonstrated to be above the defined flood level.





AO13.7 Reconfiguration and road design ensure residents are not physically isolated from adjacent urban areas that are above the 1% AEP flood level and provides a safe and clear evacuation route:

(a) by locating the access into the reconfiguration above the defined flood level or connecting to a road that is above the 1% AEP flood level;

(b) by direct and simple routes to main roads; and

by avoiding culs-de-sac and other non-permeable layouts

Where for Material Change of Use or Building Work or Operational Works PO14

Development involving earthworks in a flood hazard area below the defined flood level must protect life and property on premises and off premises through maintaining:

(a) flood storage capacity of land;

(b) flood conveyance function of land;

(c) flood and drainage channels;

(d) overland flow paths; and

(e) flood warning times.

Where for Material Change of Use or Building Work or Operational Works AO14

Development does not involve in excess of 50m3 of fill above ground level per 1,000 metres squared of site area.

N/A – no earthworks are proposed or required within the Potential Flood Hazard Area

3.2 Access, Damage and Scour

The main access to the site is proposed to be off Holland Road. It is understood that Holland Road

traverses the Potential Flood Hazard Area and therefore, it should be noted, that access to and from

the site might be limited during flood events.

The proposed design should consider the potential for damage of subarrays and scour of the posts,

particularly those located in the Potential Flood Hazard Area. It is noted that extreme events can

occur which may inundate parts of the site outside the Potential Flood Hazard Area.


Summary


4 Summary

The proposed development is not expected to impact existing flood hazard based on the following:

• No ground treatment, filling or excavation is proposed within the Potential Flood Hazard Area,

• The staff parking, amenities, substation and battery storage facility is expected to be located

outside the Potential Flood Hazard Area,

• The proposed development does not include internal roads,

• The 30-60 permanent on site staff will be located outside the Potential Flood Hazard Area. Road

access to buildings above the level of the 1% AEP flood level is to be provided for permanent on

site staff.

• Limited equipment (subarrays on posts with diameter approximately 0.3m) will be located within

the Potential Flood Hazard Area.

Access to and from the Site may be affected by flooding because the proposed access is via Holland

Road, which traverses the Potential Flood Hazard Area.

The proposed design should consider the potential for damage of subarrays and scour of the posts

located within the Potential Flood Hazard Area.


References


5 References

Flood hazard overlay code and Flood Hazard Overlay Map – OM007a, as part of Somerset Regional

Council’s Planning Scheme, downloaded from Council’s website on 30 January 2018.

Kilcoy Solar Farm ‘High-Level’ Flood Hazard Assessment A-1

Proposed Development and Layout


Proposed Development and Layout

The table below summarises all information provided about the project to date.

Component Detail

Basic development details

Maximum energy generation

It’s proposed that a total of three 500MW facilities will be development. Stage 1 will construct two 500MW facilities, Stage 2 will construct the remainder.

Total number of panels Each 500MW facility requires 1,730,400 panels For all stages (1,500MW) 5,191,200 panels are required

Solar panel installation No surface treatment is required A fixed structure single post ground mounting system will be used Depending on the soil condition there may be no need to concrete the mounting

poles

Electrical connection to panels

All panels will be connected underground but this is subject to final design

Movement of panels All panels will be fixed and will not rotate during the day

How are the panels installed

Solar panels are installed in subarrays Each subarray consists of 21 solar panel modules and will be in a 3 x 7

configuration Each subarray has dimensions of 11.9m x 3.016m and an a

rea of 35.89m²

Error! No text of specified style in document. 2

Approximate area of land required

Each 500MW facility requires approximately 500Ha of land In total for the full 500MW approximately 1,500Ha of land is required

Separation of subarray Each subarray will be placed in a row separated by 0.5m and columns separated by 6m – 6.5m

Ground treatment under solar panels

The ground will not be treated under the solar panels

Battery storage That will be battery module in container Each container is 4MW In total 125 containers will be required No specific ground treatment required for the batteries but likely to be stored on

gravel area Approximately 48,562m² of area will be required for battery storage, this

configuration can be flexible Location can also be flexible Transport of batteries offsite will be infrequent

Error! No text of specified style in document. 3

Life of operation 25 – 30 years After that period a decision will be made to rehabilitate or replace panels

Construction time Stage 1 will take 16 months Stage 2 will take an additional 8 – 12 months

Site ownership The lots will not be leased, all sites will be purchased

Access Main access to the site will be off Holland Road

Maximum gradient for construction

There is no maximum gradient the panels can be fitted on but steep land should be avoided due to the extra cost.

Internal roads Internal road construction will be avoided

DAGUILAR HIGHWAY

GREGORS CREEK ROAD

RUCK

ERS L

ANE

ROAD

SPRI

NG C

REEK

ROA

D

HOLLAND ROAD

KANG

AROO

CRE

EK R

OAD

RICHTER ROADPOHLMANS RANGE ROADSINNAMONS LANE

Sunshine Energy – KilcoySite Plan

0 10.5km

18/04/2018

1:30,000

This product is for informational purposes and may not have beenprepared for, or be suitable for legal, engineering, or surveyingpurposes. The map layers displayed are compiled from varioussources. Therefore, no warranty is given relation to thedata displayed on this map (including accuracy, reliability,completeness, currency or suitability) and accepts no liability (including without limitation, liability in negligence) for any loss, damage or costs(including consequential damage) relating to any use of the data.

Disclaimer

GDA 94 Zone 56

Data Source: QGIS 2017 & SRC 2016 iNote: this map contains some digitised layers. These layers are an approximate representation only. Refer to Somert Planning Scheme for original layers.

Site BoundaryStaging areasPotential Developable Areas -Solar Panel Area

Building areasKoala solar panelsPowerlink substationStaff parking and amenitiesSunshine Energy substation andbattery storageBuilding area 10m bufferProposed access road275kV Electricity Transmission80m EasementPotential Flood Hazard Area(State Floodplain AssessmentOverlay) (SRC and SPP)High Scenic Amenity AreasCadastre

SubstationSubstation andbattery storage

Staff parking and amenities

Koala solarpanels

Access point

Stage 1 Stage 2

Kilcoy Solar Farm ‘High-Level’ Flood Hazard Assessment B-1

Flood Hazard Overlay Code


Flood Hazard Overlay Code

7.2.7 Flood hazard overlay code

7.2.7.1 Application

This code applies to accepted development subject to requirements and assessable development: (1) subject to the flood hazard overlay shown on the overlay maps contained within Schedule 2;

and

(2) identified as requiring assessment against the flood hazard overlay code by the tables of assessment in Part 5.

7.2.7.2 Purpose and overall outcomes

(1) The purpose of the code is to manage development outcomes in flood hazard areas so that risk to life, property, community and the environment during flood events is minimised to an acceptable or tolerable level, including other property.

(2) The purpose of the code will be achieved through the following overall outcomes:

(a) Development in the Extreme flood hazard area: (i) maintains and enhances the hydrological function of the land; (ii) does not involve filling (earthworks) or changes to existing landform or drainage

lines that results in a loss of the flood conveyance and flood storage capacity of the land;

(iii) is limited to: A. recreation activities where for outdoor sport and recreation and park; B. rural activities where for animal husbandry, cropping, and permanent

plantation; C. utility installations where not involving water and sewerage treatment plants,

substations, major electricity infrastructure; D. conservation and natural area management; and E. replacement of existing lawful development, including accommodation activities

where habitable rooms are elevated above the defined flood level and freeboard;

where there is no increase to the number of persons at risk of flood and where development reduces existing or potential risks to life and property.

(b) Development in the High flood hazard area: (i) maintains the hydrological function of the land; (ii) does not involve filling (earthworks) or changes to the existing landform or drainage

lines that results in a loss of the flood conveyance and flood storage capacity of the land;

(iii) is limited to: A. recreation activities where for outdoor sport and recreation and park , and club

uses; B. a dwelling house only where the lot existed or had a lawful reconfiguring a lot

approval at the commencement of the planning scheme, the land is included in a Residential Zone or Centre zone category and the risk to the dwelling house can be mitigated to an acceptable or tolerable level,

C. a dwelling house where for minor intensification of existing dwelling houses; D. rural activities where for animal husbandry, cropping, and permanent

plantation; E. industrial activities and business activities where it is accepted that flood

damage is incurred as an operational cost and where flood sensitive elements of the development or use are elevated above the defined flood level and freeboard;

F. utility installations where not involving water and sewerage treatment plants, substations, major electricity infrastructure;

G. conservation and natural area management; and H. replacement of existing lawful development; where there is no increase to the number of persons at risk of flood and where development reduces existing or potential risks to life and property.

(iv) does not increase the flood hazard on surrounding land uses; (v) elevates habitable rooms for all accommodation activities (including where for minor

building work) above the defined flood level and freeboard.

(c) Development in the Significant flood hazard area: (i) minimises risk to life and property from flood events; (ii) involves changes to the existing landform and drainage lines in this area only where

detrimental impacts to the flood hazard risk of surrounding areas is avoided; (iii) is limited to:

A. recreation activities; B. industrial activities and business activities where it is accepted that flood

damage is incurred as an operational cost and where flood sensitive elements of the development or use are elevated above the defined flood level and freeboard;

C. rural activities; D. accommodation activities, excluding residential care facility and retirement

facility; E. community activities, excluding child care centre, community care centre,

hospital and community use where a flood emergency evacuation plan ensures the safety of people during a flood event;

F. utility installations where not involving water and sewerage treatment plants, substations, major electricity infrastructure;

G. conservation and natural area management; (iv) locates habitable rooms for all accommodation activities above the defined flood

level and freeboard; and (v) locates the minimum floor level for all buildings other than accommodation activities,

industrial activities and business activities above the defined flood level.

(d) Development in the Low flood hazard area: (i) minimises risk to life and property from flood events; (ii) locates habitable rooms for all accommodation activities above the defined flood

level and freeboard; and (iii) locates the minimum floor level for all buildings other than accommodation activities

above the defined flood level and freeboard.

(e) Development in the Potential flood hazard area: (i) maintains the safety of people on the development site from flood events and

minimises the potential damage from flooding to property; (ii) does not result in adverse impacts on people’s safety, the environment or the

capacity to use land within the floodplain; (iii) locates habitable rooms for all accommodation activities above the defined flood

level and freeboard; and (iv) locates the minimum floor level for all building work other than accommodation

activities above the defined flood level and freeboard.

(f) Development in all flood hazard areas: (i) supports, and does not unduly burden, disaster management response or recovery

capacity and capabilities; (ii) avoids the release of hazardous materials into floodwaters; and (iii) facilitates the location and design of community infrastructure to maintain the

required level of functionality during and immediately after a natural hazard event.

7.2.7.3 Assessment benchmarks

Part A – Requirements for accepted development and assessment benchmarks for assessable development

Table 7.2.7.3.A - Requirements for accepted development and assessment benchmarks for assessable development

Performance outcomes Acceptable outcomes

For accepted development subject to requirements and assessable development

All flood hazard areas PO1 Development prevents the carriage or dispersal of contaminants or pollutants into the receiving environment.

AO1 The processing or storage of dangerous goods or hazardous materials is: (a) not undertaken in a flood hazard area on Flood

Hazard Overlay Map OM-007; or (b) is located above the defined flood level; and

(c) designed to prevent the intrusion of floodwaters

PO2 Minor electricity infrastructure which supplies a new development must be located and designed to be as resilient as practicable during and after a defined flood event.

Where for a reconfiguration of a lot involving Minor electricity infrastructure (pad mount transformer) A02.1 Where land for the development is below the defined flood level, the Minor electricity infrastructure (pad mount transformer) for the development must be located on land above the defined flood level. AO2.2 Where land for the development is in an area where the defined flood level is not defined, the Minor electricity infrastructure (pad mount transformer) for the development must be located on a higher part of the site and designed to prevent the intrusion of floodwaters.

Extreme flood hazard area PO3 Development within an Extreme flood hazard area on Flood Hazard Overlay Map (OM-007) is appropriate to the flood hazard risk having regard to the: (a) likelihood and frequency of flooding; (b) the flood risk acceptability of

development; (c) the vulnerability of and safety risk to

persons associated with the use; and (d) associated consequences of flooding in

regard to impacts on proposed buildings, structures and supporting infrastructure.

Where for Material Change of Use AO3.1 Uses within the following Activity groups are not located within an Extreme flood hazard area identified on Flood Hazard Overlay Map OM-007: (a) Accommodation activities; (b) Business activities; (c) Centre activities; (d) Community activities; (e) Entertainment activities, except where for a

Club with a maximum gross floor area of 100m2;

(f) Industry activities; (g) Rural activities, except where for animal

husbandry, cropping, and permanent plantation.

AO3.2 Recreation activities are not located within an Extreme flood hazard area identified on Flood Hazard Overlay Map OM-007 except where for: (a) Park; and (b) Outdoor Sport and Recreation (excluding the

provision of ancillary facilities or amenities conducted within a building).

Performance outcomes Acceptable outcomes AO3.3 Utility installations where involving water and sewerage treatment plants are not located within an Extreme flood hazard area identified on Flood Hazard Overlay Map OM-007.

PO4 Development is located and designed to: (a) maintain and enhance the flood

conveyance capacity of the premises; (b) not increase the number of people

calculated to be at risk from flooding; (c) not increase the flood impact on

adjoining premises; (d) ensure the safety of all persons by

ensuring that development levels are set above the defined flood level;

(e) reduce property damage; and (f) provide road access to buildings above

the level of the 1% AEP flood level. Note- in the event that a lawful building or structure is destroyed by flood or other event the building may be replaced in situ where there is no increase in: (a) gross floor area; or (b) the number of dwellings or bedrooms on the

premises.

Where for Material Change of Use or Building Work AO4.1 Buildings, including extensions to existing buildings are: (a) not located within an Extreme flood hazard

area on Flood Hazard Overlay Map OM-007; or

(b) elevated above the defined flood level. OR

AO4.2 New buildings are: (a) located on the highest part of the site to

minimise entrance of floodwaters; and (b) provided with pedestrian and vehicle

evacuation access between the building and a road that is above the 1% AEP flood level.

Where for Reconfiguring a Lot AO4.3 Additional lots, except where for the purposes of public open space: (a) are not located in areas of Extreme flood

hazard area as identified on Flood Hazard Overlay Map OM-007; or


AO4.4 Reconfiguration and road design ensure residents are not physically isolated from adjacent urban areas that are above the 1% AEP flood level and provides a safe and clear evacuation route: (a) by locating the access into the

reconfiguration above the defined flood level or connecting to a road that is above the 1% AEP flood level;


(c) by avoiding culs-de-sac and other non-permeable layouts.

PO5 Development siting, layout and flood risk management minimises the impact on property and appropriately protects the health and safety of persons at risk of Extreme flood hazard.

Where for Material Change of Use or Reconfiguring a Lot that involves new gross floor area or increases the number of persons living, working or residing in areas of Extreme flood hazard area other than a Dwelling house AO5.1 Signage is provided on site: (a) indicating the position and path of all safe

Performance outcomes Acceptable outcomes evacuation routes off the site; and

(b) if the site contains or is within 100 metres of a flood hazard area, hazard warning signage and depth indicators are provided at key hazard points, such as at floodway crossings or entrances to low-lying reserves.

AO5.2 A material change of use or reconfiguring a lot that involves new gross floor area or increases the number of persons living, working or residing in areas of Extreme flood hazard area as identified on Flood Hazard Overlay Map OM-007 is supported by a Flood Emergency Evacuation Plan prepared by suitably qualified persons having regard to Managing the Floodplain: A Guide to Best Practice in Flood Risk Management in Australia, prepare by the Australian Government.

Where for Material Change of Use or Building Work or Operational Works PO6 Development involving earthworks in a flood hazard area below the defined flood level must protect life and property on premises and off premises through maintaining: (a) flood storage capacity of land; (b) flood conveyance function of land; (c) flood and drainage channels; (d) overland flow paths; and (e) flood warning times.

Where for Material Change of Use or Building Work or Operational Works AO6 Filling above ground level is not undertaken in areas of Extreme flood hazard area as identified on Flood Hazard Overlay Map OM-007.

High flood hazard area PO7 Development within a High flood hazard area on Flood Hazard Overlay Map OM-007 is appropriate to the flood hazard risk having regard to the: (a) likelihood and frequency of flooding; (b) the flood risk acceptability of




Where for Material Change of Use AO7.1 Uses within the following Activity groups are not located within a High flood hazard area identified on Flood Hazard Overlay Map OM-007: (a) Accommodation activities, except where for

dwelling house and only where the lot existed or had a lawful reconfiguring a lot approval at the commencement of the planning scheme and the land is included in a Residential Zone or Centre zone category;

(b) Centre activities, except where for business activities;

(c) Community activities or Entertainment activities, except where for a Club with a maximum gross floor area of 100m2;

(d) Rural activities, except where for animal husbandry, cropping, and permanent plantation.

AO7.2 Recreation activities are not located within a High flood hazard area identified on Flood Hazard Overlay Map OM-007 except where for: (a) Park; and (b) Outdoor Sport and Recreation (excluding the

provision of ancillary facilities or amenities

Performance outcomes Acceptable outcomes conducted within a building).

AO7.3 Utility installations where involving water and sewerage treatment plants are not located within a High flood hazard area identified on Flood Hazard Overlay Map OM-007.

PO8 Development is located and designed to: (a) maintain hydrological function of the

premises; (b) not increase the number of people

calculated to be at risk from flooding; (c) minimises the flood impact on adjoining

premises; (d) ensure the safety of all persons by

ensuring that an appropriate proportion of buildings are set above the defined flood level;

(e) reduce the carriage of debris in flood waters;

(f) reduce property damage; and (g) provide road access to buildings above

the level of the 1% AEP flood level.

Where for Material Change of Use or Building Work AO8.1 Buildings, including extensions to existing buildings are: (a) not located within a High flood hazard area on

Flood Hazard Overlay Map OM-007; or (b) elevated above the defined flood level;

OR AO8.2 Where for business activities or industry activities buildings the minimum floor level supporting the following elements of the development must be located above the defined flood level: (a) administrative areas; (b) services, plant and equipment associated with

the building.

Editor’s Note- AO8.2 accepts that the cost of flood impact is an operational cost of the business activity or industry activity. AO8.3 New buildings are: (a) located on the highest part of the site to



Where for Accommodation activities AO8.4 Dwellings do not exceed four bedrooms. AO8.5 Building work on an existing dwelling does not comprise additional bedrooms. AO8.6 Building work on an existing dwelling is limited to a maximum increase of 20 percent of the lawfully approved gross floor area of the existing dwelling. AO8.7 Design and layout of buildings minimises risk from flooding by providing parking and other non-habitable uses at ground level. Where for Reconfiguring a Lot

Performance outcomes Acceptable outcomes AO8.8 Additional lots, except where for the purposes of public open space: (a) are not located in areas of High flood hazard

area as identified on Flood Hazard Overlay Map OM-007 ; or





(c) by avoiding culs-de-sac and other non-permeable layouts.

PO9 Development siting, layout and flood risk management minimises the impact on property and appropriately protects the health and safety of persons at risk of High flood hazard.

Where for Material Change of Use or Reconfiguring a Lot that involves new gross floor area or increases the number of persons living, working or residing in areas of High flood hazard area other than a Dwelling house AO9.1 Signage is provided on site: (a) indicating the position and path of all safe

evacuation routes off the site; and (b) if the site contains or is within 100 metres of

a flood hazard area, hazard warning signage and depth indicators are provided at key hazard points, such as at floodway crossings or entrances to low-lying reserves.


Where for Material Change of Use or Building Work or Operational Works PO10 Development involving earthworks in a flood hazard area below the defined flood level must protect life and property on premises and off premises through maintaining: (a) flood storage capacity of land;

Where for Material Change of Use or Building Work or Operational Works AO10.1 Filling above ground level is not undertaken in areas of High flood hazard area as identified on Flood Hazard Overlay Map OM-007. AO10.2

Performance outcomes Acceptable outcomes (b) flood conveyance function of land; (c) flood and drainage channels; (d) overland flow paths; and (e) flood warning times.

Note- where the development is located in a Potential Flood Hazard Area as identified on Flood Hazard Overlay Map OM-007, and there is no defined flood level, a hydraulic (flood hazard assessment) report prepared by a RPEQ is required in substantiation of a Performance Solution. Alternatively, the defined flood level from an adjacent representative hazard area may be used if deemed appropriate by Council.

Development that involves earthworks in a floodplain must result in no net loss of flood storage for all storm events up to and including a 1 in 100 year ARI event and adjoining properties must remain free draining with no resultant increase in flood levels.

Significant flood hazard area PO11 Development within a Significant flood hazard area on Flood Hazard Overlay Map OM-007 is appropriate to the flood hazard risk having regard to the: (a) likelihood and frequency of flooding; (b) the flood risk acceptability of




Where for Material Change of Use AO11 The following uses are not located within a Significant flood hazard area identified on Flood Hazard Overlay Map OM-007: (a) child care centre; (b) community care centre; (c) community residence; (d) community use; (e) emergency services; (f) hospital; (g) residential care facility; (h) retirement facility; or (i) utility installation involving water and sewerage

treatment plants.

PO12 Development siting, layout and flood risk management minimises the impact on property and appropriately protects the health and safety of persons at risk of Significant flood hazard.

Where for Material Change of Use that involves three or more dwellings, or accommodation activities, business activities, centres activities, entertainment activities or community activities with a staff or resident or non-resident worker or guest occupancy of more than 10 persons on premises at any one time AO12.1 Signage is provided on site: (a) indicating the position and path of all safe

evacuation routes off the site; and (b) if the site contains or is within 100 metres of a

flood hazard area, hazard warning signage and depth indicators are provided at key hazard points, such as at floodway crossings or entrances to low-lying reserves.


Performance outcomes Acceptable outcomes Significant flood hazard area, Low flood hazard area or Potential flood hazard area PO13 Development is located and designed to: (a) maintain hydrological function of the

premises; (b) not increase the number of people

calculated to be at risk from flooding; (c) minimises the flood impact on adjoining

premises; (d) ensure the safety of all persons by

ensuring that a proportion of buildings are set above the defined flood level;

(e) reduce the carriage of debris in flood waters;

(f) reduce property damage; and (g) provide road access to buildings above

the level of the 1% AEP flood level. Note- where the development is located in a Potential flood hazard area as identified on Flood Hazard Overlay Map OM-007, and there is no defined flood level, a hydraulic (flood hazard assessment) report prepared by a RPEQ is required in substantiation of a Performance Solution. Alternatively, the defined flood level from an adjacent representative hazard area may be used if deemed appropriate by Council.

Where for Material Change of Use or Building Work AO13.1 Buildings, including extensions to existing buildings are: (a) elevated above the defined flood level; and (b) and the defined flood event does not exceed a

depth of 600mm.

OR AO13.2 Where for business activities or industry activities buildings the minimum floor level supporting the following elements of the development must be located above the defined flood level: (a) administrative areas; (b) services, plant and equipment associated with

the building.

Editor’s Note- AO13.2 accepts that the cost of flood impact is an operational cost of the business activity or industry activity. Editor’s Note: Businesses should ensure that they have the necessary continuity plans in place to account for the potential need to relocate property prior to a flood event (e.g. allow enough time to transfer stock to the upstairs level of a building or off site). Editor’s Note: The relevant building assessment provisions under the Building Act 1975 apply to all building work within the Flood Hazard Area and need to take account of the flood potential within the area. AO13.3 Where the defined flood level is known , new buildings are: (a) located on the highest part of the site to



AO13.4 Where the defined flood level is not known, new buildings are: (a) located on the highest part of the site to

minimise entrance of floodwaters; and (b) provided with clear and direct pedestrian and

vehicle evacuation access.

AO13.5

Where for accommodation activities, the design and layout of buildings minimises risk from flooding to an acceptable or tolerable level by providing parking and other non-habitable uses at ground level.

Performance outcomes Acceptable outcomes Where for Reconfiguring a Lot AO13.6 Additional lots, except where for the purposes of public open space: (a) are not located in areas of Significant flood

hazard area, Low flood hazard area or Potential flood hazard area as identified on Flood Hazard Overlay Map OM-007 ; or





by avoiding culs-de-sac and other non-permeable layouts.

Where for Material Change of Use or Building Work or Operational Works PO14 Development involving earthworks in a flood hazard area below the defined flood level must protect life and property on premises and off premises through maintaining: (a) flood storage capacity of land; (b) flood conveyance function of land; (c) flood and drainage channels; (d) overland flow paths; and (e) flood warning times.

Where for Material Change of Use or Building Work or Operational Works AO14 Development does not involve in excess of 50m3 of fill above ground level per 1,000 metres squared of site area.

Note: Defined flood event and defined flood level are defined in Schedule 1.

Kilcoy Solar Farm ‘High-Level’ Flood Hazard Assessment C-1

Flood Hazard Overlay Map


Flood Hazard Overlay Map

1

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