the water supply and sewerage infrastructure plan … · of the water supply and sewerage...

Water Supply and Sewerage Infrastructure Plan 2014

Volume 1 November 2014

Doc # 43873766 – Ver.4 – November 14 Water Supply & Sewerage Infrastructure Plan 2014 – Volume 1 Page ii

Document Control:

Version Description Author Date Reviewed by

1 First Draft Coordinator Strategic Infrastructure Planning -George Parrott

June 2014 Executive Coordinator IWCP - Kathy Baker

2 Second Draft Coordinator Strategic Infrastructure Planning -George Parrott

June 2014 Executive Coordinator IWCP - Kathy Baker

3 Submission to OIC, 15/07/14 Coordinator Strategic Infrastructure Planning -George Parrott

July 2014 Executive Coordinator IWCP - Kathy Baker

4 Document for Public Exhibition

Coordinator Strategic Infrastructure Planning -George Parrott

Aug 2014 Executive Coordinator IWCP - Kathy Baker

5 Final Endorsed Coordinator Strategic Infrastructure Planning -George Parrott

Nov 2014 Executive Coordinator AIP - Kathy Baker

Doc # 43873766 – Ver.4 – November 14 Water Supply & Sewerage Infrastructure Plan 2014 – Volume 1 Page iii

Table of Contents

Volume 1 (this volume):

1. Introduction ...................................................................................................................... 1

1.1 Preliminary ................................................................................................................ 1

1.2 Context ..................................................................................................................... 2

1.3 Scope ....................................................................................................................... 2

List of Administrative Definitions ........................................................................................ 3

1.4 Abbreviations and Acronyms .................................................................................... 3

2. Planning Assumptions .................................................................................................... 5

2.1 General ..................................................................................................................... 5

2.2 Planning Horizons ..................................................................................................... 5

2.3 Development categories, types, zones and land uses .............................................. 6

2.4 Population, tourism and employment growth .......................................................... 10

2.5 Future development ................................................................................................ 11

2.6 Infrastructure demand ............................................................................................. 13

2.6.1 General ....................................................................................................... 13

2.6.2 Water Supply ............................................................................................... 13

2.6.3 Sewerage .................................................................................................... 14

3. Priority Infrastructure Area, Catchment Maps and Service Areas ............................. 15

3.1 Priority Infrastructure Area ...................................................................................... 15

3.2 Water Supply Service Area and Catchments .......................................................... 17

3.3 Sewerage Service Area and Catchments ............................................................... 19

4. Desired Standards of Service ....................................................................................... 21

4.1 General ................................................................................................................... 21

4.2 Water Supply .......................................................................................................... 21

4.3 Sewerage ............................................................................................................... 24

5. Plans for Trunk Infrastructure....................................................................................... 24

5.1 General ................................................................................................................... 24

5.2 Trunk and Non-trunk Infrastructure ......................................................................... 25

5.2.1 General ....................................................................................................... 25

5.2.2 Trunk Infrastructure ..................................................................................... 25

5.2.3 Non-trunk Infrastructure ............................................................................... 25

5.2.4 Schedules of Trunk and Non-trunk Infrastructure ........................................ 26

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5.3 Plans for Trunk Infrastructure.................................................................................. 26

5.3.1 General ....................................................................................................... 26

5.3.2 Plans for Trunk Water Supply Infrastructure ................................................ 26

5.3.3 Plans for Trunk Sewerage Infrastructure ..................................................... 27

5.4 Schedules of Works ................................................................................................ 27

5.4.1 General ....................................................................................................... 27

5.4.2 Establishment Cost of Trunk Infrastructure .................................................. 28

5.4.3 Water Supply Schedule of Works ................................................................ 28

5.4.4 Sewerage Schedules of Works .................................................................... 33

6. Financial Analysis.......................................................................................................... 38

7. Extrinsic Material and References ................................................................................ 39

7.1 Extrinsic Material .................................................................................................... 39

7.2 References ............................................................................................................. 41

Annexure 1: Tables of Planning Assumptions

Annexure 2: Indicative Trunk and Non-Trunk Infrastructure Specification for Water Supply and Sewerage Networks

Annexure 3: Schedules of Works for Augmentation of Trunk Water Supply Infrastructure

Annexure 4: Schedules of Works for Augmentation of Trunk Sewerage Infrastructure

Volume 2 (Appendices): A. Growth between 2011 and 2066 – Water Supply Catchments

B. Growth between 2011 and 2066 – Sewerage Catchments

C. Priority Infrastructure Area, Cadastre & City Plan 2015 Zones

D. Water Supply Catchments

E. Sewerage Catchments

F. Plans for Trunk Water Supply Infrastructure

G. Plans for Trunk Sewerage Infrastructure

H. Levels of Development

I. Soil Categories

J. High Water Table Zones

K. Major Transport Routes, Bridges and Waterways

Doc # 43873766 – Ver.4 – November 14 Water Supply & Sewerage Infrastructure Plan 2014 – Volume 1 Page 1

1. Introduction

1.1 Preliminary

The purpose of this Water Supply and Sewerage Infrastructure Plan is to:

(a) integrate water supply and sewerage infrastructure planning with the land use planning identified in the planning scheme;

(b) provide transparency regarding the City of Gold Coast’s (City’s) intentions for the provision of water supply and sewerage trunk infrastructure;

(c) enable the City to estimate the cost of future water supply and sewerage infrastructure provision to assist its long term financial planning;

(d) ensure that water supply and sewerage trunk infrastructure is planned and provided in an efficient and orderly manner, and

(e) provide a basis for the imposition of conditions about infrastructure on development approvals.

Volume 1 of the Water Supply and Sewerage Infrastructure Plan:

(a) states in Section 2 (Planning Assumptions) the assumptions about future growth and urban development including the assumptions of demand for the water supply and sewerage trunk infrastructure networks;

(b) identifies in Section 3 (Priority Infrastructure Area) the prioritised area to accommodate urban growth up to 2026;

(c) states in Section 4 (Desired Standards of Service) for each trunk infrastructure network the desired standard of performance;

(d) identifies in Section 5 (Plans for Trunk Infrastructure) the existing and future trunk infrastructure for the following networks:

(i) water supply

(ii) sewerage;

(e) provides details of the methodology to determine establishment costs in Section 6 (Establishment Costs), and

(f) provides a list of documents that assist in the interpretation of the Infrastructure Plan in Section 7 (Extrinsic Material and References).

Volume 2 of the Water Supply and Sewerage Infrastructure Plan includes A3-format maps and plans, while Volume 3 includes A3-format Schedules of Works for Augmentation of Trunk Infrastructure.


1.2 Context

This Infrastructure Plan will be incorporated in the Gold Coast Water Annual Network Services Plan, which is CoGC’s plan that demonstrates satisfactory provision of water supply and sewerage services pursuant to the requirements of section 99BJ of the South East Queensland (Distribution and Retail Restructuring) Water Act 2009. Given that the CoGC has a withdrawn council arrangement under the South East Queensland Water (Distribution and Retail Restructuring) Act 2009, the City is not required to include the water supply and sewerage networks in its Local Government Infrastructure Plan (LGIP). However, CoGC is required to ensure that the planning for water supply and sewerage is consistent with the requirements for the LGIP, and as such, this Infrastructure Plan generally follows the framework (and provides the required information) for an LGIP included in the Statutory guideline 03/14 - Local government infrastructure plans - A guideline for the preparation of local government infrastructure plans under the Sustainable Planning Act 2009 (DSDIP, 2014).

1.3 Scope

It is important to note that the trunk infrastructure identified in this Infrastructure Plan – included in the plans for trunk infrastructure (PFTI) and the associated schedules – is based on high-level planning and associated hydraulic modelling. This planning and modelling has been carried out at a scale that is appropriate for identifying the typical trunk water and sewerage infrastructure required to service the City’s growth at the stated standards of service, and in order to provide the basis for the imposition of conditions about infrastructure on development approvals. For example, the hydraulic modelling carried out to produce this Plan has been limited to the analysis of simplified models that includes all trunk infrastructure, but does not include all non-trunk assets, nor the topography of the terrain beyond the limits of the trunk models. This is why the PFTI and Schedules included in this Infrastructure Plan identify the typical trunk water and sewerage infrastructure, and why it does not address detail-scale issues beyond the scope and scale of the simplified models and the high-level planning for planning horizons no less than 5 years apart. Therefore, the PFTI and Schedules included in this Plan (as well as the simplified trunk models that have been developed) are not intended for purposes that require assessment at a more detailed scale, for example (but not limited to) detailed infrastructure planning, development of fully justified annual capital works programmes and detailed hydraulic analysis for the purposes of undertaking capacity assessments for specific development applications. For detailed-scale assessments, it will be necessary to carry out additional activities such as evaluation of a range of options, detailed assessment of constraints, detailed hydraulic modelling beyond the limits of the trunk model, as well as model calibration and/or monitoring of demands.


List of Administrative Definitions

Table 1.1 below includes a list of definitions for the purposes of this document.

Table 1.1 Definitions

Term Definition Base date The date from which a local government has estimated its projected

infrastructure demands and costs. Catchment An area for which a local government identifies the infrastructure demand

projections. Demand unit Demand units provide a standard unit of measurement to express

demand on a trunk infrastructure network. Developable area The area of land available for development. It does not include land that

cannot be developed due to constraints such as conservation land, flood affected land or steep slope. Note – For the purpose of a LGIP developable area is usually measured in hectares, developable hectares (dev ha).

Gold Coast Water Annual Network Services Plan (or Netserv Plan)

A distributor-retailer’s plan about its water and wastewater networks and provision of water service and wastewater service pursuant to section 99BJ of the South East Queensland (Distribution and Retail Restructuring) Water Act 2009.

Infrastructure Plan Water Supply and Sewerage Infrastructure Plan (this document) Planning assumptions Assumptions about population and employment growth and the type,

scale, location and timing of future development. Planning Scheme City of Gold Coast City Plan 2015 Projection area An area for which a local government identifies the assumptions about

population and employment growth and future development. Ultimate development The realistic extent of development anticipated to be achieved when a

site (or projection area or infrastructure service catchment) is developed. Urban development Development for urban purposes which includes residential (other than

rural residential), retail, commercial, industrial, community and government related purposes.

Zone A zone defined in the Planning Scheme that states the intended land uses, form, scale and intensity of development within a certain geographic area.

1.4 Abbreviations and Acronyms

Table 1.2 below includes a list of abbreviations and acronyms used in this Infrastructure Plan.


Table 1.2 Abbreviations and Acronyms

Abbreviation/Acronym Description

ADD Average Day Demand (water demand)

ADWF Average Dry Weather Flow (sewage flow)

CoGC City of Gold Coast

DEWS Department of Energy and Water Supply

DSS Desired standard(s) of service

EP Equivalent persons

GCW Gold Coast Water

IDM Infrastructure Demand Model

kL Kilolitre (unit of volume - one thousand litres)

kW Kilowatt (unit of power)

L/s Litres per second (unit of flow rate)

LGIP Local Government Infrastructure Plan

MDMM Mean Day Maximum Month (water demand)

ML Megalitre (unit of volume - one million litres)

m/s Metres per second (unit of velocity)

Netserv (Plan) Gold Coast Water Annual Network Services Plan

NRW Non-Revenue Water (water demand)

PDA Priority Infrastructure Area

PFTI Plans for Trunk Infrastructure

PD Peak Day (water demand)

PH Peak Hour (water demand)

PIA Priority Infrastructure Area

PWWF Peak Wet Weather Flow (sewage flow)

RW Recycled water

SEQ South East Queensland

SPS Sewage Pump Station

STP Sewage Treatment Plant

WPS Water Pump Station

WTP Water Treatment Plant


2. Planning Assumptions

2.1 General

The planning assumptions state the assumptions about:

(a) residential and non-residential growth, and

(b) the type, scale, location and timing of future development, including the demand for each of the trunk water supply and sewerage infrastructure networks.

The planning assumptions together with the desired standards of service (Section 4) form the basis for the planning of the trunk infrastructure networks and the determination of the priority infrastructure area. Specifically, the following two documents inform and reflect the planning assumptions:

The Planning Scheme: City Plan 2015 – draft for public consultation (CoGCa 2014) – included in References, Section 7.2

2013 Infrastructure Demand Model - Water & Sewerage Demands – included in List of Extrinsic Material, Section 7.1

The Planning Scheme expresses the type, scale and location of future development within its various Zones, while the 2013 Infrastructure Demand Model - Water & Sewerage Demands report summarises the methodology used to develop the Infrastructure Demand Model (IDM). The IDM was used to apply resident and non-resident population to each lot over time (across all the planning horizons from 2011 to 2066), for the purposes of allocating existing and future demands and flows to the water supply and sewerage infrastructure that reflects population, tourism and employment growth within the service catchments.

2.2 Planning Horizons

The planning assumptions have been prepared for the base date (2011) and the following projection years, to accord with future Australian Bureau of Statistics census years:

Mid 2016 (corresponds to period 2012 – 2016)







For the purposes of this Infrastructure Plan, ultimate development is assumed to occur within approximately 50 years from the current date – therefore the year 2066 – under the current planning framework. The exception to this is the Southport Priority Development Area (PDA), where it is likely that ultimate development will not yet be achieved by 2066. A likely rate of growth has been developed for the Southport PDA, between the base year and the year 2066, and the projections for Southport PDA (for each of the planning horizons from 2011 to 2066) are included in the planning assumptions for this Infrastructure Plan. Given the above, the year 2066 (rather than the term ‘ultimate development’) will be used in the tables of population projections, schedules of work, and the like.

2.3 Development categories, types, zones and land uses

In order to develop the planning assumptions (and specifically the IDM), the following classification of development category, development type and land use was undertaken:

Each lot was allocated with proportions of residential and non-residential category of development, across all planning horizons.

The following development types were identified:

o Attached Dwelling (also known as Multi-Unit Dwelling)

o Detached Dwelling

o Tourist – Residential

o Commercial

o Community Purpose

o Industry

o Tourist – Non-Residential

o Open Space

o Rural/Non-urban

Typical land uses were also allocated to individual lots The Planning Scheme expresses the type, scale and intensity of possible urban development within its various Zones. The Planning Scheme Zones are shown on the maps included in Appendix C in Volume 2. Table 2.1 below shows the relationship between the development categories, development types, Planning Scheme Zones and typical land uses that have been used to inform and develop the planning assumptions used for this Infrastructure Plan.


Table 2.1 Relationship between Planning Scheme and Planning Assumptions

Development Category

Planning Scheme Zones (City Plan 2015)

Typical Land Uses

Development Type

Residential Development:

Attached Dwelling (also known as Multi-Unit Dwelling)

Limited Development

Medium Density Residential

Medium Density Residential –Calypso Bay

High Density Residential

Special Purpose – Special Development Area Precinct

Township

Aged care housing

Attached dwellings (townhouses, duplex homes, units)

Community residences (attached)

Residential care facilities

Residential apartments/flats

Retirement housing (attached)

Rooming accommodation

Detached Dwelling Emerging Communities (inside service catchments)

Limited Development

Low Density Residential

Low Density Residential – Large Lot Precinct

Low Density Residential –Calypso Bay

Medium Density Residential

Rural Residential

Rural Residential – Landscape & Environment Precinct

Township (inside service catchments)

Township – Large Lot Precinct (inside service catchments)

Caretaker’s residence

Community residences (detached)

Detached dwellings

Dwellings on small lots

Eco-village homes

Relocatable home parks

Retirement housing (detached)

Tourist – Residential Centre Medium Density Residential High Density Residential

Tourist apartments

Non-residential Development:

Commercial Centre Medium Density Residential High Density Residential Mixed Use Mixed Use – Fringe Business

Bulk retail premises Childcare centres Convenience stores Entertainment venues Food and beverage outlets




Typical Land Uses

Development Type

Neighbourhood Centre Neighbourhood Centre – West

Burleigh Historic Township Pct. Special Purpose – Special

Development Area Precinct Township Zone Township Zone – Commercial

Precinct

Medical/veterinary facilities Newsagents Nightclubs/taverns Offices Post offices Shops Sales yards Service stations Showrooms

Community Purpose Community Facilities Innovation Innovation – Bond University

Precinct Innovation – Gold Coast

Cultural Precinct Special Purpose Sport and Recreation

Airports Cemeteries & Crematoriums Community halls Educational establishments Fire stations Government offices Hospitals Indoor sporting facilities Libraries Places of worship Police stations Public Utility uses (water supply,

sewerage, electricity, gas, telecommunications, transport and stormwater drainage)

Railway stations Research centres Sports stadiums

Industry Innovation Low Impact Industry Medium Impact Industry High Impact Industry Special Purpose Waterfront and Marine Industry

Bulk garden supplies Creative industries Environmental industries Fuel depots Garden centres High impact industries Low impact industries Marine industries Medium impact industries Motor vehicle repairs Outdoor storage areas Refuse disposal Refuse transfer station Technology parks Salvage yards




Typical Land Uses

Development Type

Sea ports Storage facilities Warehouses Waterfront industry

Tourist – Non-Residential

Centre Medium Density Residential High Density Residential Major Tourism Major Tourism – Wildlife Park

Precinct Major Tourism – Sea World

Precinct

Caravan parks Function facilities Short-term tourist accommodation Theme parks Wildlife parks

Open Space Open Space Special Purpose Sport and Recreation Sport and Recreation – Bond

University Precinct Sport and Recreation – Bundall

Equestrian Precinct

Active recreational activities Animal exercise areas Community gardens Markets Passive recreational areas Sports grounds

Generally Not Serviced with Water Supply:

Rural/Non-urban Conservation Emerging Communities

(outside water supply service catchment)

Extractive Industry Extractive Industry – Indicative

Buffer Major Tourism - Island Resorts Open Space Rural Rural – Landscape &

Environment Precinct Township (outside water supply

service catchment) Township – Large Lot Precinct

(outside water supply service area)

Unzoned

Agricultural land Conservation reserves Farm buildings/houses Flood plains Island resorts National and State Parks Rural industry Quarries

Generally Not Serviced with Sewerage:

Rural/Non-urban Conservation Agricultural land




Typical Land Uses

Development Type

Emerging Communities (outside sewerage service catchment)

Extractive Industry Extractive Industry – Indicative

Buffer Major Tourism - Island Resorts Rural Rural – Landscape &

Environment Precinct Rural Residential Rural Residential – Landscape

& Environment Precinct Township (outside sewerage

service area) Township – Large Lot Precinct

(outside sewerage service catchment)

Unzoned

Conservation reserves Farm buildings/houses Flood plains Island resorts National and State Parks Rural industry Rural residential properties Quarries

The detailed methodology used to prepare the planning assumptions and to develop the IDM is included in the IDM Report (part of the extrinsic material – see Section 7).

2.4 Population, tourism and employment growth

For the purposes of developing assumptions for growth in demand for the water supply and sewerage network, resident population, tourism and employment was calculated by the IDM as either resident or non-resident equivalent persons (EP), for each of the planning horizons, for each lot. The resident population, as well as some tourist accommodation (typically tourist apartments that have an occupancy pattern similar to residential use), are categorised as resident population (and a residential EP gets allocated by the IDM), while commercial, industrial, community purpose use, as well as tourist attractions and short-term tourist accommodation are categorised as non-residential, with a non-resident EP allocated by the IDM. A summary of the assumptions for resident population and non-resident EP are included in Table 2.2 below. It should be noted that the IDM (and the EP generated by the IDM) only covers that part of the planning scheme area, that generally aligns with the water supply and sewerage service areas. A summary of the EPs for the water supply and sewerage service areas (per catchment) are summarised in Section 2.6. The EPs in Table 2.2 below and the EPs in Section 2.6 are not an exact match, given that the extent of the IDM’s geographical


area is slightly larger than the extent of the catchment boundaries – in order to ensure that no lots included within the catchments are not allocated EPs by the IDM.

Table 2.2 Summary of Residential and Non-residential Population Assumptions


Assumptions for Residential and Non-residential Population in EP, per planning horizon – by Category

Base year (2011)

2016 2021 2026 2031 2036 2066

Residential 509,077 593,316 665,057 731,091 779,368 871,585 1,016,865

Non-residential

113,700 124,637 152,978 165,577 173,206 180,155 361,858

TOTAL EP 622,777 717,953 818,035 896,668 952,574 1,051,740 1,378,723

Detailed assumptions about growth for each projection area and development type are identified in the tables in Annexure 1 of this volume, as follows:

Table A.1: Residential Development Population (in EP), by Projection Area

Table A.2: Non-residential Development Population (in EP), by Projection Area The projection areas included in Tables A.1 and A.2 (see Annexure 1) are Statistical Areas, Level 2 (SA2), which are one of the spatial units defined under the Australia Statistical Geography Standard (ASGS). As of 2013, the SA2 boundaries were the smallest area for which the State Government calculated existing dwellings and populations, as well as forecasts out to the year 2036. The geographical extent of the SA2 projection areas are shown on the growth maps included in Appendix A (for Water Supply Catchments) and Appendix B (for Sewerage Catchments) in Volume 2. These growth maps also diagrammatically represent the extent of population growth (total of residential and non-residential EP) at a lot level, between the base year (2011) and 2066.

2.5 Future development

The developable area, as it relates to those parts of the planning scheme area that are planned to be serviced with a water supply and sewerage service, is identified on the Service Area and Catchment Maps, shown in Figure 3.2 (for water supply) and Figure 3.3 (for sewerage), in Section 3. The growth assumptions in terms of residential and non-residential EP, for the different development categories and types, are summarised in Table 2.3 below.


Table 2.3 – Summary of Future Development and Growth Assumptions


Assumptions for Future EP Growth per planning horizon – by Development Category and Type

Development Type 2011 EP

2016 EP 2021 EP 2026 EP 2031 EP 2036 EP 2066 EP

EP Growth EP Growth EP Growth EP Growth EP Growth EP Growth

Growth/year Growth/year Growth/year Growth/year Growth/year Growth/year

Residential Development:

Detached Dwellings

306,327

354,087 367,157 385,914 397,079 420,152 475,886

47,760 13,070 18,757 11,165 23,073 55,734

3.12% 0.74% 1.02% 0.58% 1.16% 0.44%

Attached Dwellings

150,620

179,120 230,513 267,672 297,195 359,504 422,515

28,500 51,393 37,159 29,523 62,309 63,011

3.78% 5.74% 3.22% 2.21% 4.19% 0.58%

Tourist Residential

52,130

60,109 67,388 77,505 85,094 91,928 118,463

7,979 7,279 10,117 7,589 6,834 26,535

3.06% 2.42% 3.00% 1.96% 1.61% 0.96%

Totals for Residential Development

509,077 593,316 665,057 731,091 779,368 871,585 1,016,865 84,239 71,741 66,034 48,277 92,217 145,280 3.31% 2.42% 1.99% 1.32% 2.37% 0.56%

Non-residential:

Tourist (non-residential)

22,933

25,075 28,965 29,866 29,172 28,205 45,022

2,142 3,890 901 -694 -967 16,817

1.87% 3.10% 0.62% -0.46% -0.66% 1.99%

Commercial 31,063

36,146 41,653 45,183 47,133 48,535 147,955

5,083 5,507 3,530 1,950 1,402 99,420

3.27% 3.05% 1.69% 0.86% 0.59% 6.83%

Industry 33,819

37,557 43,814 48,837 52,725 57,863 109,722

3,738 6,257 5,023 3,888 5,138 51,859

2.21% 3.33% 2.29% 1.59% 1.95% 2.99%

Community Purpose

25,885

25,860 38,545 41,690 44,177 45,552 59,159

-25 12,685 3,145 2,487 1,375 13,607

-0.02% 9.81% 1.63% 1.19% 0.62% 1.00%

Total Non-residential

113,700 124,637 152,978 165,577 173,206 180,155 361,858 10,937 28,341 12,599 7,629 6,949 181,703 1.92% 4.55% 1.65% 0.92% 0.80% 3.36%

TOTAL EP (Residential & Non-res)

622,777 717,953 818,035 896,668 952,574 1,051,740 1,378,723 95,176 100,082 78,633 55,906 99,166 326,983 3.06% 2.79% 1.92% 1.25% 2.08% 1.04%


2.6 Infrastructure demand

2.6.1 General

A summary of the projected infrastructure demand for each service catchment is included in the following sections, as follows:

(a) Section 2.6.2 for the water supply network; (b) Section 2.6.3 for the sewerage network.

Information is provided in terms of EP, as well as Average Day Demand (ADD) for the water supply network and Average Dry Weather Flow (ADWF) for the sewerage network. The relationship between EP and ADD is included in Section 4.2, while the relationship between EP and ADWF is included in Section 4.3.

2.6.2 Water Supply

Table 2.4 below summarises the total forecasted EPs (residential and non-residential EP) per water supply catchment.

Table 2.4 Total of Residential and Non-Residential Equivalent Persons per Planning Horizon, per Water Supply Catchment

Water Supply Catchment

Total of Residential & Non- Residential EP, per planning horizon

2011 2016 2021 2026 2031 2036 2066

Coolangatta 67,770 70,231 80,011 85,605 88,362 92,523 103,125

Gaven 63,708 83,368 90,527 99,059 109,205 114,938 169,710

Molendinar 321,928 349,337 388,984 426,043 453,842 504,355 630,911

Mudgeeraba 112,352 121,959 131,206 137,827 148,388 164,283 206,090

Pimpama 29,180 58,424 85,187 102,731 104,170 119,403 170,670

Stapylton 29,551 36,100 41,935 45,134 48,078 52,965 95,089

TOTAL 624,488 719,419 817,851 896,399 952,045 1,048,467 1,375,594

Table 2.5 below summarises the forecasted Average Day Demand (ADD) in ML/day, for each of the water supply catchments.


Table 2.5 Average Day Demand per Planning Horizon, per Water Supply Catchment

Water Supply Catchment

Average Day Demand (ML/d), per planning horizon

2011 2016 2021 2026 2031 2036 2066

Coolangatta 16 17 19 21 21 22 25

Gaven 15 20 22 23 26 27 40

Molendinar 77 84 94 102 109 121 152

Mudgeeraba 27 29 32 33 36 40 50

Pimpama 6 12 18 22 23 26 38

Stapylton 7 9 10 11 11 12 23

TOTAL 149 170 194 213 227 250 328

2.6.3 Sewerage

Table 2.6 below summarises the total forecasted EPs (residential and non-residential EP) per sewerage catchment.

Table 2.6 Total of Residential and Non-Residential Equivalent Persons per Planning Horizon, per Sewerage Catchment

Sewerage Catchment

Total of Residential & Non- Residential EP, per planning horizon

2011 2016 2021 2026 2031 2036 2066

Coombabah 286,157 324,846 355,283 388,761 417,779 457,308 613,954

Elanora 94,850 83,702 93,545 84,633 88,145 92,238 95,245

Merrimac 157,324 187,191 209,551 243,739 261,837 292,787 356,024

Pimpama 26,918 55,226 83,426 100,889 102,302 117,512 167,649

Stapylton 25,588 32,013 37,762 40,824 43,719 48,539 90,069

TOTAL 590,837 682,979 779,567 858,845 913,781 1,008,384 1,322,941


Table 2.7 below summarises forecasts of Average Dry Weather Flow (ADWF) in ML/day for each of the sewerage catchments.

Table 2.7 Average Dry Weather Flow per Planning Horizon, per Sewerage Catchment

Sewerage Catchment

Average Dry Weather Flow (ML/d), per planning horizon

2011 2016 2021 2026 2031 2036 2066

Coombabah 59 67 74 81 87 95 128

Elanora 19 17 19 17 18 19 20

Merrimac 33 39 44 51 55 61 75

Pimpama 6 12 18 21 21 25 35

Stapylton 5 7 8 9 9 10 19

TOTAL 123 142 162 179 191 210 276

3. Priority Infrastructure Area, Catchment Maps and Service Areas

3.1 Priority Infrastructure Area

The priority infrastructure area (PIA) identifies the area prioritised for the provision of trunk infrastructure to service the existing and assumed future urban development up to 2026. A summary map of the PIA is identified in Figure 3.1 overleaf. Detailed maps that describe the PIA at a property boundary scale are included in Appendix C (Volume 2).


Figure 3.1 Summary Map of Priority Infrastructure Area


3.2 Water Supply Service Area and Catchments

The extent of the water supply service area is shown in Figure 3.2 overleaf. The water supply service area consists of the following six water supply catchments: Stapylton Pimpama Gaven Molendinar Mudgeeraba Coolangatta

The extent of each of the water supply catchments is also shown in greater detail in Appendix D (Volume 2). Within the water supply service area, lots may have an existing water supply service or may be planned to be provided with a water supply service, except for those Planning Scheme precincts included in Table 3.1 below.

Table 3.1 Areas not planned to be serviced – Water Supply

City Plan 2015 Zones

Conservation

Emerging Communities (outside water supply service catchment)

Extractive Industry

Extractive Industry – Indicative Buffer

Major Tourism - Island Resorts

Open Space

Rural

Rural – Landscape & Environment Precinct

Township (outside water supply service catchment)

Township – Large Lot Precinct (outside water supply service catchment)

Unzoned

CoGC is not required to provide a potable water supply in those areas not planned to be serviced. In the event that CoGC agrees to provide a potable water supply to a development in an area not planned to be serviced, infrastructure charges will be levied and the cost of any additional infrastructure required will be paid by the developer.


Figure 3.2 Water Supply Service Area and Catchments


3.3 Sewerage Service Area and Catchments

The extent of the sewerage service area is shown in Figure 3.3 overleaf. The sewerage service area consists of the following five sewerage catchments: Stapylton Pimpama Coombabah Merrimac Elanora

The extent of each of the sewerage catchments is also shown in greater detail in Appendix E (Volume 2). Within the sewerage service area, lots may have an existing sewerage service or may be planned to be provided with a sewerage service, except for those Planning Scheme precincts included in Table 3.2 below.

Table 3.2 Areas not planned to be serviced – Sewerage

City Plan 2015 Zones

Conservation

Emerging Communities (outside sewerage service catchment)

Extractive Industry

Extractive Industry – Indicative Buffer

Major Tourism - Island Resorts

Open Space

Rural

Rural – Landscape & Environment Precinct

Rural Residential

Rural Residential – Landscape & Environment Precinct

Township (outside water supply service catchment)

Township – Large Lot Precinct (outside sewerage service catchment)

Unzoned

CoGC is not required to provide sewerage in those areas not planned to be serviced. In the event that CoGC agrees to provide sewerage to a development in an area not planned to be serviced, infrastructure charges will be levied and the cost of any additional infrastructure required will be paid by the developer.


Figure 3.3 Sewerage Catchments and Service Area


4. Desired Standards of Service

4.1 General

This section outlines the desired standards of service (DSS) for the trunk water supply and sewerage infrastructure networks. The DSS for all new and augmented trunk water supply and sewerage infrastructure aligns with the standards of the SEQ Water Supply and Sewerage Design and Construction Code (SEQ WS&S D&C Code) of 2013. It is not generally intended that existing water supply and sewerage infrastructure will be upgraded to meet the standards for new infrastructure in cases where the DSS for new infrastructure are at a higher level than that of past DSS, given that existing infrastructure was planned, designed and constructed in the past, to the standards applicable at the time. In most cases, the DSS of the SEQ WS&S D&C Code is equal or very similar to the earlier DSS standards recommended by the Gold Coast Water Desired Standards of Service Review 2008. However, there is a significant difference between the SEQ WS&S D&C Code for new infrastructure and the Desired Standards of Service Review 2008, in the case of maximum depth of flow in gravity sewers. The DSS used for this Infrastructure Plan therefore generally applies the standards of the SEQ WS&S D&C Code, except for the assessment of the existing infrastructure, where there is a lower standard included in the Desired Standards of Service Review 2008, and this lower standard was then included in the DSS for the existing infrastructure. This is the case regarding the depth of flow for gravity sewers, where different standards apply for the assessment of existing gravity sewers and future gravity sewers, detailed in Section 4.3. This Infrastructure Plan does not include upgrading of existing infrastructure for any reason other than where there is a growth-related reason. Where augmentation of existing infrastructure is required to service future development, then the DSS for new infrastructure (aligning with the SEQ WS&S D&C Code) was applied. Further details specific to the DSS for trunk water supply and sewerage infrastructure are included in Section 4.2 and Section 4.3 respectively.

4.2 Water Supply

This section summarises the key desired standards of service for the water supply network. A specific point of departure from the SEQ WS&S D&C Code was in the application of the peaking factor for peak hour water demand. The SEQ WS&S D&C Code water network design criteria shows a peaking factor of 6.03 for detached dwellings in the Gold Coast, whereas it shows a peaking factor of 4.0 for all the other local government areas in South East Queensland (SEQ), and with very similar Average Day Demand (ADD) per EP. A peak hour peaking factor of 6.03 represents a peak hour demand approximately 50% higher than that of the rest of SEQ. There is no specific data currently available, but it is considered unlikely that


there will be such a significant difference between the water usage behaviours of the people living in single detached homes in the Gold Coast as compared to those of the rest of SEQ. Therefore, for the purposes of the high level planning undertaken for this Infrastructure Plan, it was decided to adopt the upper range of the peaking factor for peak hour recommended by the Department of Energy and Water Supply Planning Guidelines for Water Supply and Sewerage (DEWS 2014), namely 4.5. This peaking factor of 4.5 (rather than 6.03), is much closer to the factor of 4.0 recommended for design purposes for the rest of the local government areas of SEQ, while still being at the conservative end of the range recommended by the Planning Guidelines for Water Supply and Sewerage. Based on a peaking factor of 4.5 for peak hour and an ADD of 220L/EP/day (plus 20L/EP/day non-revenue water) for the Gold Coast, compared to a peaking factor of 4.0 for peak hour and an ADD of 230L/EP/day (plus 30L/EP/day non-revenue water) for the rest of SEQ, the Gold Coast peak hour demand for detached dwellings equates to 42.1L/EP/hour, compared to 39.6L/EP/hr for the rest of SEQ. This relatively minor difference (6%) is considered to be comparable and reasonable, and a detached dwelling peaking factor of 4.5 for the peak hour is therefore considered appropriate for the Gold Coast, for the purposes of the high level planning undertaken for this Infrastructure Plan. The key DSS used for trunk water supply infrastructure is summarised in Table 4.1.

Table 4.1 Summary of Key DSS used for Trunk Water Supply Infrastructure

Parameter Standard for Infrastructure Plan

Average Day Demand (ADD) 220L/EP/day

Non-revenue Water (NRW) 20L/EP/day (peaking factors are not applied to NRW)

Peaking Factors: Detached Dwelling

Attached Dwelling

Commerce/ Community

Indus. Tourist Open Space

Mean Day Maximum Month/ADD (MDMM/ADD)

1.75 1.27 1.06 1.06 1.76 1.15

Peak Day/ADD (PD/ADD) 2.12 1.45 1.12 1.12 2.51 1.37

Peak Hour/ADD (PH/ADD) 4.5 2.97 2.32 1.54 6.03 2.40

DSS for mains:

Minimum service pressure with reservoirs at min. operating level

22m in the main adjoining property boundary

Maximum service pressure 80m

Maximum allowable velocity in mains

2.5m/s

DSS for Reservoirs:

Ground Level Reservoir Storage Capacity

Operational Storage Capacity:


Parameter Standard for Infrastructure Plan 3 x (PD – MDMM) + Emergency Storage

Emergency Storage Capacity:

Greater of 4 hours at MDMM, or 0.5ML (and for less than 1000EP: 150kL)

Note: PD and MDMM is in kL/d, and reservoir storage is in kL

Elevated Reservoir Storage Capacity

Minimum Capacity:

6 x (PH – 1/12 MDMM) + 150kL fire flow storage

Where 8 x PH is less than or equal to MDMM, then capacity:

2 x PH + 150kL fire flow storage

Note: PH and MDMM is in kL/d and reservoir storage is in kL

Reservoir duty pump requirements Ground level reservoir, where pump included: MDMM for 20 hours

Elevated reservoir: Pump capacity = PH in L/s

Fire Fighting Requirements*:

Urban area flows Residential: 15L/s for 2 hours

Commercial/Industrial: 30L/s for 4 hours

Rural and small community flows Rural Residential only: 7.5L/s for 2 hours

Rural Commercial/Industrial: 15L/s for 2 hours

Minimum residual mains pressure during fire fighting conditions

• 12m in the main, at the hydrant

• 9m minimum for existing infrastructure in small isolated or high elevation areas

Background demand Residential: 2/3 Peak Hour (and not less than ADD)

Non-residential: Peak Hour for localised Industrial/Commercial or 2/3 PH for whole water supply zone

* Fire fighting requirements were assessed for the existing network only. Where the existing system shows deficiencies in terms of the above DSS for fire fighting requirements, no augmentations were included, given that only growth-related augmentations (not augmentations related to existing deficiencies) are included in this Infrastructure Plan.


4.3 Sewerage

This section summarises the key desired standards of service (DSS) for the sewerage network. The key DSS used for trunk sewerage infrastructure is summarised in Table 4.2.

Table 4.2 Summary of Key DSS used for Trunk Sewerage Infrastructure

Parameter Standard for Infrastructure Plan

Average dry weather flow (ADWF) per EP, for sewerage network

210L/EP/day

Peak wet weather flow (PWWF) 5 x ADWF

Maximum depth of flow at PWWF for existing gravity mains

Up to 1.0m below manhole level (used as a trigger for augmentation, not a planning/design criterion for new infrastructure)

Maximum depth of flow at PWWF for new/augmented gravity mains

Up to 75% of the pipe diameter

Minimum velocity for gravity sewers 0.7m/s

Pump Station pumping capacity Minimum pumping capacity = PWWF

Pump Station Emergency Storage 4 hours at ADWF

Maximum rising main velocity 3m/s

Minimum rising main velocity 0.75m/s

5. Plans for Trunk Infrastructure

5.1 General

The plans for trunk infrastructure (PFTI) identify the existing and typical planned future trunk infrastructure networks intended to service the existing and assumed development at the desired standard of service, up to 2066. The following sections include:

Definitions and descriptions of trunk and non-trunk infrastructure – Section 5.2

Plans for Trunk Infrastructure – Section 5.3

Schedules of works – Section 5.4


5.2 Trunk and Non-trunk Infrastructure

5.2.1 General

Definitions of trunk and non-trunk infrastructure are included in Sections 5.2.2 and 5.2.3 below.

5.2.2 Trunk Infrastructure

Infrastructure has to satisfy one of the following criteria in order to be defined as trunk infrastructure:

new infrastructure that is required to perform a higher order, shared function (for example infrastructure linking a community consisting of at least two separate developments or sub-divisions with existing trunk infrastructure), and has a size equal to or greater than the threshold sizes (where provided) in the lists of trunk infrastructure for water supply and sewerage included in Annexure 2, or

augmentation of existing or future infrastructure where the augmentation is required to perform a higher order, shared function, and that has a size equal to or greater than the threshold sizes (where provided) in the lists of trunk infrastructure for water supply and sewerage included in Annexure 2, or

any infrastructure that is identified in the current Water Supply and Sewerage Infrastructure Plan as trunk infrastructure or is included in the current GCW capital program.

5.2.3 Non-trunk Infrastructure

Non-trunk infrastructure is defined as infrastructure that does not perform a higher order, shared function, including (but not exclusive to):

new or augmented infrastructure required due to a single development/subdivision, irrespective of the size or function of the infrastructure, for example new infrastructure required to link a new development with existing trunk infrastructure, or augmentation of existing infrastructure required to serve a new development;

all infrastructure within any new development (i.e. internal reticulation), irrespective of the size of the infrastructure;

all infrastructure in private ownership;

any infrastructure where the proposed timing of the infrastructure is out of sequence with the timing (horizon) included in the current Water Supply and Sewerage Infrastructure Plan, irrespective of whether that infrastructure would otherwise be defined as trunk infrastructure, and

any infrastructure not included in the definition of trunk infrastructure.


5.2.4 Schedules of Trunk and Non-trunk Infrastructure

Annexure 2 of this volume includes schedules of indicative trunk and non-trunk water supply and sewerage infrastructure.

5.3 Plans for Trunk Infrastructure

5.3.1 General

The future trunk infrastructure identified in the plans for trunk infrastructure (PFTI) are labelled with a unique reference number, to cross reference to the schedule of works tables (see Section 5.4). Future infrastructure for each planning horizon is differentiated on the plans by unique colours, for example red for 2016. Existing trunk infrastructure is also shown on the plans. It should be noted that the planning horizons shown on the PFTI correspond to associated planning periods, as follows:

2016: corresponds to the period 2012 – 2016






5.3.2 Plans for Trunk Water Supply Infrastructure

The plans for trunk infrastructure for water supply are included in Volume 2, Appendix F: Plans for Trunk Water Supply Infrastructure. The plans for trunk water supply infrastructure (and the associated schedules of works) have been derived from the planning and hydraulic modelling for each water supply catchments that was done as part of the project to develop this Infrastructure Plan, and are summarised in the following reports (included in the list of Extrinsic Material, Section 7.1):

Stapylton Water Supply Catchment – Modelling Report

Pimpama Water Supply Catchment – Modelling Report

Gaven Water Supply Catchment – Modelling Report

Molendinar Water Supply Catchment – Modelling Report

Mudgeeraba Water Supply Catchment – Modelling Report

Coolangatta Water Supply Catchment – Modelling Report


It should be noted that the PFTI plans in Appendix F show Class A+ recycled water (RW) assets for the existing system, but there are no Class A+ RW assets for the future horizons. The reason for this is that the City made the decision in December 2013 to switch the supply from Class A+ recycled water to potable water over the next two to three years in order to significantly reduce the operational costs incurred by the Class A+ RW water supply, including energy costs associated with treating RW to a Class A+ standard as well as the very high monitoring/compliance costs. This Infrastructure Plan therefore shows all future water supply infrastructure as potable water supply only, with no Class A+ RW from 2016, and includes the shut-down of the existing Pimpama Recycled Water Treatment Plant before 2016. The Council decision also means that some of the current Class A+ mains will in the future be utilised for other trunk infrastructure, such a dedicated effluent release main from Pimpama to Coombabah.

5.3.3 Plans for Trunk Sewerage Infrastructure

The plans for trunk infrastructure for sewerage are included in Volume 2, Appendix G: Plans for Trunk Sewerage Infrastructure. The plans for trunk sewerage infrastructure (and the associated schedules of works) have been derived from the planning undertaken for the sewage treatment plants, as well as the planning and hydraulic modelling undertaken for each sewerage catchments that was done as part of the project to develop this Infrastructure Plan, and are summarised in the following reports (included in the list of Extrinsic Material, Section 7.1):

Sewage Treatment Plant Growth Planning Report 2013

Stapylton Sewerage Catchment – Modelling Report

Pimpama Sewerage Catchment – Modelling Report

Coombabah Sewerage Catchment (Helensvale District) – Modelling Report

Coombabah Sewerage Catchment (Coombabah District) – Modelling Report

Merrimac Sewerage Catchment (Merrimac East District) – Modelling Report

Merrimac Sewerage Catchment (Merrimac West District) – Modelling Report

Elanora Sewerage Catchment – Modelling Report

5.4 Schedules of Works

5.4.1 General

The Schedules of Works for future trunk infrastructure are included in:




The Schedules of Works provides the following information for each item of future trunk infrastructure identified on the plans:

the service catchment(s) to which it relates;

the relevant planning horizon at which it is required, in order to service the infrastructure demand at the DSS;

a unique reference number, to cross reference to the PFTI plans;

a description of the infrastructure (typically including size and location), and

the estimated establishment cost of the infrastructure. Detailed Schedules of Works, that provide details at an individual asset level, are included in Water and Sewerage Infrastructure Plan 2014 - Detailed Schedules of Works (CoGC, 2014). This document also includes information on

5.4.2 Establishment Cost of Trunk Infrastructure

The Water and Sewerage Infrastructure Plan 2014 - Detailed Schedules of Works (CoGC, 2014) outlines the basis for estimating the establishment cost of future trunk infrastructure. The establishment cost of future trunk infrastructure was generally based on the unit costs outlined in the Unit Rates Report – prepared for Gold Coast Water (Cardno, 2013). In addition to unit rates, adjustment factors that reflect the built and natural environment and that have an influence on the construction of water and sewerage infrastructure were applied to the unit rates in order to determine establishment costs. The adjustment factors including the following:

Levels of development (2011 to 2066) – summarised in Volume 2, Appendix H

Soil categories – summarised in Volume 2, Appendix I

High water table zones – summarised in Volume 2, Appendix J

Major transport routes, bridges and waterways – summarised in Volume 2, Appendix K

Adjustment factors for length of linear infrastructure Cost estimates are based on 2013 establishment costs.

5.4.3 Water Supply Schedule of Works

Schedules of Works for Augmentation of Trunk Water Supply Infrastructure are included in Annexure 3 of this Infrastructure Plan. Summary of Establishment Costs of Trunk Water Supply Infrastructure:

Tables 5.1 to 5.7 below summarise the establishment costs of the future trunk water supply infrastructure, as included in the schedules of works.


Table 5.1 Summary of Establishment Cost of Trunk Water Supply Infrastructure, for Stapylton Water Supply Catchment

Network components

Establishment cost by planning horizon ($ 2013)

2016 2021 2026 2031 2036 2066

Mains $1,475,645 $0 $0 $0 $0 $191,973

Reservoirs $0 $0 $0 $0 $0 $0

Pump stations $627,838 $0 $0 $0 $0 $0

Control valves $175,842 $0 $0 $0 $0 $45,566

Preparation cost $24,086 $0 $0 $0 $0 $0

Total $2,303,412 $0 $0 $0 $0 $237,539

Table 5.2 Summary of Establishment Cost of Trunk Water Supply Infrastructure, for Pimpama Water Supply Catchment

Network components


2016 2021 2026 2031 2036 2066

Mains $3,974,521 $3,114,503 $0 $2,552,701 $81,493 $7,037,416

Reservoirs $0 $0 $0 $883,365 $0 $1,354,545

Pump stations $208,346 $136,217 $0 $123,144 $0 $912,569

Control valves $282,166 $0 $0 $0 $0 $151,890


Total $4,504,014 $3,250,721 $0 $3,559,210 $81,493 $9,456,420


Table 5.3 Summary of Establishment Cost of Trunk Water Supply Infrastructure, for Gaven Water Supply Catchment

Network components


2016 2021 2026 2031 2036 2066

Mains $303,240 $845,002 $0 $754,569 $287,901 $0

Reservoirs $0 $0 $0 $0 $0 $0

Pump stations $108,682 $0 $0 $0 $0 $108,682

Control valves $527,526 $0 $0 $45,566 $0 $0


Total $995,071 $845,002 $0 $800,135 $287,901 $108,682

Table 5.4 Summary of Establishment Cost of Trunk Water Supply Infrastructure, for Molendinar Water Supply Catchment

Network components


2016 2021 2026 2031 2036 2066

Mains $790,923 $136,501 $147,086 $64,003 $2,143,822 $15,781,415

Reservoirs $612,586 $0 $116,070 $0 $0 $0

Pump stations $71,652 $0 $0 $136,217 $0 $0

Control valves $133,487 $0 $0 $45,566 $45,566 $45,566


Total $1,841,727 $136,501 $263,156 $245,787 $2,189,388 $15,826,981


Table 5.5 Summary of Establishment Cost of Trunk Water Supply Infrastructure, for Mudgeeraba Water Supply Catchment

Network components


2016 2021 2026 2031 2036 2066

Mains $23,000 $0 $0 $0 $3,181,810 $2,123,210

Reservoirs $2,510,278 $0 $0 $0 $0 $0

Pump stations $0 $139,930 $0 $0 $0 $0

Control valves $0 $0 $0 $0 $0 $0


Total $2,614,650 $139,930 $0 $0 $3,181,810 $2,123,210

Table 5.6 Summary of Establishment Cost of Trunk Water Supply Infrastructure, for Coolangatta Water Supply Catchment

Network components


2016 2021 2026 2031 2036 2066

Mains $195,461 $223,351 $152,377 $325,644 $45,580 $1,047,670

Reservoirs $1,826,761 $0 $0 $0 $0 $0

Pump stations $0 $0 $0 $0 $0 $0

Control valves $0 $0 $0 $0 $0 $0


Total $2,069,081 $223,351 $152,377 $325,644 $45,580 $1,047,670


Table 5.7 Summary of Establishment Costs of Trunk Water Supply Infrastructure, for all Water Supply Catchments

Catchment Establishment cost by planning horizon ($ 2013)

2016 2021 2026 2031 2036 2066

Stapylton $2,303,412 $0 $0 $0 $0 $237,539

Pimpama $4,504,014 $3,250,721 $0 $3,559,210 $81,493 $9,456,420

Gaven $995,071 $845,002 $0 $800,135 $287,901 $108,682

Molendinar $1,841,727 $136,501 $263,156 $245,787 $2,189,388 $15,826,981

Mudgeeraba $2,614,544 $139,930 $0 $0 $3,181,810 $2,123,210

Coolangatta $2,069,081 $223,351 $152,377 $325,644 $45,580 $1,047,670

Total $14,327,848 $4,595,504 $415,534 $4,930,776 $5,786,173 $28,800,502


5.4.4 Sewerage Schedules of Works

Schedules of Works for Augmentation of Trunk Sewerage Infrastructure are included in Annexure 4 of this Infrastructure Plan. Summary of Establishment Costs of Trunk Sewerage Infrastructure:

Tables 5.8 to 5.13 below summarise the establishment costs of the future trunk sewerage infrastructure, as included in the schedules of works.

Table 5.8 Summary of Establishment Cost of Trunk Sewerage Infrastructure, for Stapylton Sewerage Catchment

Network components


2016 2021 2026 2031 2036 2066

Category 1

STP proportion $24,953,106 $0 $19,589,113 $0 $0 $23,765,092

Long Term Release proportion

$598,564 $6,748,999 $532,856 $4,233,907 $0 $103,329

Pimpama-Coombabah Release Main proportion

$477,045 $5,141,375 $1,843,681 $0 $0 $1,328,049

Category 2

Gravity sewers $10,440,504 $10,452,452 $0 $0 $0 $11,864,841

Rising mains $16,857,909 $47,218,072 $507,519 $0 $0 $408,862

Pump stations $6,238,544 $3,905,886 $388,666 $0 $0 $3,285,340


Total $59,598,482 $73,466,784 $22,861,834 $4,233,907 $0 $40,755,513


Table 5.9 Summary of Establishment Cost of Trunk Sewerage Infrastructure, for Pimpama Sewerage Catchment

Network components


2016 2021 2026 2031 2036 2066

Category 1

STP proportion $43,046,894 $0 $48,410,887 $0 $0 $44,234,908


$1,032,590 $14,910,279 $1,316,855 $9,907,298 $0 $192,330


$822,955 $11,358,625 $4,556,319 $0 $0 $2,471,951

Category 2

Gravity sewers $8,198,745 $1,790,777 $716,989 $344,240 $1,108,104 $293,420

Rising mains $3,414,372 $0 $0 $0 $1,343,248 $3,814,626

Pump stations $2,922,803 $0 $0 $0 $1,363,886 $1,688,647


Total $59,494,962 $28,059,681 $55,001,049 $10,251,538 $3,815,239 $52,695,882


Table 5.10 Summary of Establishment Cost of Trunk Sewerage Infrastructure, for Coombabah Sewerage Catchment

Network components


2016 2021 2026 2031 2036 2066

Category 1

STP proportion $10,000,000 $74,000,000 $70,000,000 $0 $100,000,000 $154,000,000


$6,073,817 $63,497,815 $5,074,307 $40,459,238 $0 $704,341


$0 $0 $0 $0 $0 $0

Category 2

Helensvale District:

Gravity sewers $1,468,969 $0 $0 $160,711 $0 $15,748,637

Rising mains $0 $0 $2,869,554 $2,149,031 $0 $6,081,903

Pump stations $7,520,429 $310,637 $0 $1,608,028 $625,286 $5,529,902

Coombabah District:

Gravity sewers $0 $209,300 $853,379 $736,437 $6,479,791 $14,694,115

Rising mains $9,019,075 $287,322 $475,632 $139,742 $2,909,376 $11,101,759

Pump stations $11,550,283 $636,129 $6,293,280 $624,442 $7,050,475 $34,229,284


Total $45,965,515 $138,941,203 $85,566,153 $45,877,628 $117,064,928 $242,089,941


Table 5.11 Summary of Establishment Cost of Trunk Sewerage Infrastructure, for Merrimac Sewerage Catchment

Network components


2016 2021 2026 2031 2036 2066

Category 1

STP proportion $0 $2,000,000 $143,000,000 $0 $68,000,000 $68,000,000


$3,500,009 $40,974,929 $4,135,887 $4,127,512 $0 $0


$1,032,590 $14,910,279 $1,316,855 $9,907,298 $0 $192,330

Category 2

Merrimac East District:

Gravity sewers $1,557,573 $0 $0 $0 $5,109,522 $15,746,807

Rising mains $664,298 $0 $3,583,918 $0 $117,202 $97,063

Pump stations $2,680,990 $0 $1,270,774 $800,379 $638,318 $2,025,543

Merrimac West District:

Gravity sewers $8,018,451 $0 $190,952 $0 $6,177,272 $3,005,722

Rising mains $18,495,704 $0 $0 $0 $2,214,888 $33,928

Pump stations $10,229,227 $614,061 $1,476,199 $249,341 $2,523,069 $10,217,491


Total $46,370,697 $58,499,269 $154,974,585 $15,084,530 $84,780,270 $99,318,884


Table 5.12 Summary of Establishment Cost of Trunk Sewerage Infrastructure, for Elanora Sewerage Catchment

Network components


2016 2021 2026 2031 2036 2066

Category 1

STP proportion $0 $0 $0 $0 $9,400,000 $36,000,000


$1,565,020 $18,291,489 $1,436,096 $1,389,489 $0 $0


$0 $0 $0 $0 $0 $0

Category 2

Gravity sewers $0 $0 $0 $0 $0 $0

Rising mains $6,043,088 $0 $0 $0 $0 $4,555,925

Pump stations $1,785,231 $127,718 $280,086 $0 $0 $2,053,901


Total $9,479,128 $18,419,206 $1,716,181 $1,389,489 $9,400,000 $42,609,825

Table 5.13 Summary of Establishment Costs of Trunk Sewerage Infrastructure, for all Sewerage Catchments

Catchment Establishment cost by planning horizon ($ 2013)

2016 2021 2026 2031 2036 2066

Stapylton $59,598,482 $73,466,784 $22,861,834 $4,233,907 $0 $40,755,513

Pimpama $59,494,962 $28,059,681 $55,001,049 $10,251,538 $3,815,239 $52,695,882

Coombabah $45,965,515 $138,941,203 $85,566,153 $45,877,628 $117,064,928 $242,089,941

Merrimac $46,370,697 $58,499,269 $154,974,585 $15,084,530 $84,780,270 $99,318,884

Elanora $9,479,128 $18,419,206 $1,716,181 $1,389,489 $9,400,000 $42,609,825

Total $220,908,783 $317,386,143 $320,119,803 $76,837,092 $215,060,436 $477,470,045


6. Financial Analysis The financial analysis undertaken, using the Department of State Development and Infrastructure Planning methodology, indicates that there will be sufficient cash flow to deliver the capital works required to service growth. The modelling is reliant on the anticipated dwelling and floor space growth; however in recent years the City has not realised this growth and as such the revenue from infrastructure charges has been less than anticipated in the model. The City reviews the timing and location of the capital works program identified in the Water and Sewerage Infrastructure Plan 2014 to ensure that infrastructure is only provided as it is required. Another factor that dramatically affects the financial modelling and the ability of the City to fund growth infrastructure is the establishment costs of the infrastructure. While costs are indexed by a ten (10) year average producers price index (PPI) the contract price at the time of construction can vary significantly depending on the market. The City’s Water and Sewerage business is economically regulated by the Queensland Competition Authority (QCA) where all revenue and costs are reviewed to ensure the business does not recover more than the maximum allowable revenue determined by the QCA. To this end the fluctuations in cash flows from infrastructure charges are managed by balancing it with revenue from water and sewerage fees and charges.


7. Extrinsic Material and References

7.1 Extrinsic Material

The documents identified in Table 7.1 below assist in the interpretation of the LGIP – Water Supply and Sewerage Networks, and are extrinsic material under the Statutory Instruments Act 1992.


Table 7.1 List of Extrinsic Material

Title of document Date Organisation

that prepared document

CoGC doc. ref. number

2013 Infrastructure Demand Model - Water & Sewerage Demands

July ‘14 CoGC (GCW) #42751898

Sewage Treatment Plant Growth Planning Report 2013 July ‘14 CoGC (GCW) #41972165

Stapylton Water Supply Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43497200

Pimpama Water Supply Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43559277

Gaven Water Supply Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43532264

Molendinar Water Supply Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43999522

Mudgeeraba Water Supply Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43999457

Coolangatta Water Supply Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43999337

Stapylton Sewerage Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #44009038

Pimpama Sewerage Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43994225

Coombabah Sewerage Catchment (Helensvale District) – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43999276

Coombabah Sewerage Catchment (Coombabah District) – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43993113

Merrimac Sewerage Catchment (Merrimac East District) – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43999138

Merrimac Sewerage Catchment (Merrimac West District) – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #44110650

Elanora Sewerage Catchment – Hydraulic Modelling Report 2014

July ‘14 CoGC (GCW) #43999241

Unit Rates Report – prepared for Gold Coast Water July ‘14 Cardno #40226150

Water and Sewage Infrastructure Plan 2014: Detailed Cost Analysis: Method and results

July ‘14 CoGC (GCW) #45680604


7.2 References

City of Gold Coast (CoGC), 2014, Draft City Plan 2015 – Public Consultation http://cityplan.goldcoast.qld.gov.au/Pages/plan/viewer.aspx?vid=10107 Department of Energy and Water Supply, 2014, Planning Guidelines for Water Supply and Sewerage, April 2010 (Chapter 6 amended March 2014). Department of State Development, Infrastructure and Planning (DSDIP), 2014, Statutory guideline 03/14 - Local government infrastructure plans - A guideline for the preparation of local government infrastructure plans under the Sustainable Planning Act 2009, June 2014. State of Queensland, 2014, South East Queensland (Distributor Retailer Restructure) Water Act 2009, May 2014. Water Service Association of Australia (WSAA), 2013, SEQ Water Supply and Sewerage Design and Construction Code (SEQ WS&S D&C Code), July 2013.


Annexure 1: Tables of Planning Assumptions

Table A.1: Residential Development Population (in EP), by Projection Area

Projection area (SA2) Development type Existing and projected residential EP, per planning horizon

2011 2016 2021 2026 2031 2036 2066

Broadbeach Waters Detached Dwelling 7,267 7,279 7,338 9,777 10,172 10,271 10,271

Attached Dwelling 1,142 1,145 1,156 1,246 1,246 1,272 1,272

Tourist Residential 0 0 0 0 0 0 0

Total Residential EP, per SA2 8,409 8,425 8,495 11,023 11,418 11,543 11,543

Burleigh Heads Detached Dwelling 2,868 2,977 2,697 2,558 2,558 2,558 2,558




Burleigh Waters Detached Dwelling 10,239 10,239 10,239 10,239 10,260 12,385 12,657




Mermaid Beach - Broadbeach Detached Dwelling 1,688 1,680 20 109 109 107 107


Tourist Residential 9,981 11,186 13,940 15,488 16,449 16,449 17,650




2011 2016 2021 2026 2031 2036 2066

Mermaid Waters Detached Dwelling 8,989 8,989 9,074 9,338 9,222 10,156 13,219




Miami Detached Dwelling 2,978 2,981 2,988 2,860 2,494 2,127 2,146




Coolangatta Detached Dwelling 1,047 1,068 683 650 650 650 650




Currumbin - Tugun Detached Dwelling 5,422 5,573 4,790 4,300 4,068 4,079 4,108


Tourist Residential 4 376 1,302 2,250 3,139 3,142 3,142


Currumbin Waters Detached Dwelling 7,673 7,911 8,180 8,495 8,603 8,853 9,330





2011 2016 2021 2026 2031 2036 2066


Elanora Detached Dwelling 10,560 10,567 10,623 10,623 10,625 10,625 10,653




Palm Beach Detached Dwelling 8,516 8,543 8,032 6,596 6,256 7,084 7,084


Tourist Residential 32 48 821 827 2,161 3,394 3,394


Arundel Detached Dwelling 8,283 8,283 8,283 8,283 8,283 8,283 11,699




Biggera Waters Detached Dwelling 2,061 2,051 2,066 2,099 1,618 1,229 1,365


Tourist Residential 9 9 6 567 567 567 1,043


Parkwood Detached Dwelling 8,492 8,506 8,506 8,509 8,509 8,509 12,390

Attached Dwelling 720 720 720 720 720 720 715



2011 2016 2021 2026 2031 2036 2066



Coombabah Detached Dwelling 4,617 4,614 4,614 4,566 4,550 3,896 3,403




Labrador Detached Dwelling 4,789 4,790 4,977 4,986 4,362 3,515 3,792


Tourist Residential 11 38 108 533 1,049 1,377 1,377


Paradise Point - Hollywell Detached Dwelling 6,655 6,630 6,630 7,338 6,983 6,438 7,239




Oxenford - Maudsland Detached Dwelling 11,356 12,044 12,044 12,044 12,380 13,089 15,700




Pimpama Detached Dwelling 1,829 10,560 14,842 15,386 15,386 15,386 25,064



2011 2016 2021 2026 2031 2036 2066

Attached Dwelling 618 1,326 7,256 7,334 7,334 7,334 10,236



Upper Coomera - Willow Vale Detached Dwelling 14,493 30,706 30,723 30,853 30,860 30,860 37,506




Clear Island Waters Detached Dwelling 2,993 2,996 3,167 3,309 3,336 3,539 5,538




Merrimac Detached Dwelling 3,558 3,566 3,604 4,447 4,500 4,008 4,567




Robina Detached Dwelling 15,794 15,856 15,872 16,725 16,191 19,786 19,786






2011 2016 2021 2026 2031 2036 2066

Varsity Lakes Detached Dwelling 9,136 6,689 6,666 7,273 5,447 5,808 5,808




Ashmore Detached Dwelling 9,175 9,254 9,573 10,531 10,508 11,935 12,810




Molendinar Detached Dwelling 5,645 5,645 5,650 5,650 5,650 5,653 5,653




Runaway Bay Detached Dwelling 5,424 5,413 5,410 5,593 5,525 4,878 5,492




Guanaba - Springbrook Detached Dwelling 14 14 14 14 14 14 16





2011 2016 2021 2026 2031 2036 2066

Total Residential EP, per SA2 14 14 14 14 14 14 16

Currumbin Valley - Tallebudgera

Detached Dwelling 4,382 4,393 4,414 4,414 4,512 4,787 5,107




Mudgeeraba - Bonogin Detached Dwelling 14,189 14,514 14,514 14,514 14,514 16,105 21,290




Reedy Creek - Andrews Detached Dwelling 4,016 5,128 5,128 5,128 5,537 5,950 7,002




Carrara Detached Dwelling 7,046 8,732 9,291 10,015 10,821 11,684 14,217




Highland Park Detached Dwelling 7,696 7,699 7,699 7,699 8,373 10,964 10,964




2011 2016 2021 2026 2031 2036 2066



Nerang - Mount Nathan Detached Dwelling 14,098 15,747 16,180 17,689 20,745 24,490 24,490




Pacific Pines - Gaven Detached Dwelling 11,745 11,780 11,833 11,833 11,768 14,391 8,625




Worongary - Tallai Detached Dwelling 7,389 7,642 10,884 14,798 16,608 16,608 16,608




Coomera Detached Dwelling 1,438 11,744 11,742 11,730 11,730 11,749 15,929




Helensvale Detached Dwelling 13,714 14,906 16,403 19,185 24,923 28,305 28,305



2011 2016 2021 2026 2031 2036 2066




Hope Island Detached Dwelling 1,566 2,005 2,656 3,668 4,494 4,494 4,494




Jacobs Well - Alberton Detached Dwelling 2,084 2,537 2,811 2,811 2,811 2,811 3,406

Attached Dwelling 530 530 4,017 4,017 4,017 4,017 4,367



Ormeau - Yatala Detached Dwelling 11,609 17,157 19,701 19,701 19,819 20,144 24,932




Southport Detached Dwelling 11,603 11,947 12,604 12,604 12,619 11,180 18,654






2011 2016 2021 2026 2031 2036 2066

Benowa Detached Dwelling 5,723 5,868 6,904 7,195 7,423 9,294 9,777




Bundall Detached Dwelling 3,337 3,373 3,763 4,514 5,424 5,424 5,424




Main Beach Detached Dwelling 211 205 105 3 3 3 3

Attached Dwelling 226 243 837 1,041 1,041 1,041 1,041



Surfers Paradise Detached Dwelling 2,920 3,286 3,218 5,260 5,836 6,047 6,047




Inside priority infrastructure area (within IDM extent)






2011 2016 2021 2026 2031 2036 2066

Total Residential EP inside PIA 506,390 586,876 657,040 723,074 771,317 863,461 1,007,523

Outside priority infrastructure area (within IDM extent)


Attached Dwelling 485 484 2,054 2,053 2,054 2,053 2,051


Total Residential EP outside PIA 2,687 6,440 8,017 8,017 8,051 8,124 9,342

City of Gold Coast (within IDM extent)




Total Residential EP 509,077 593,316 665,057 731,091 779,368 871,585 1,016,865


Table A.2: Non-residential Development Population (in EP), by Projection Area

Projection area (SA2) Development type Existing and projected non-residential EP per planning horizon

2011 2016 2021 2026 2031 2036 2066

Broadbeach Waters Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 1732 1840 2022 2189 2190 2190 5141

Industry 0 0 0 0 0 0 0

Community Purpose 43 45 94 99 99 99 266

Total Non-Res EP per SA2 1776 1884 2116 2289 2289 2290 5407

Burleigh Heads Tourist (non-residential) 79 290 578 745 789 840 1694

Commercial 1207 1185 1232 1259 1268 1268 1850

Industry 3426 3538 3708 3796 3817 3918 5367



Burleigh Waters Tourist (non-residential) 110 111 118 118 73 73 1

Commercial 832 847 850 863 868 868 6973

Industry 154 261 264 266 267 270 308



Mermaid Beach - Broadbeach

Tourist (non-residential) 1926 2158 2144 2052 2052 1997 2247

Commercial 938 692 710 715 715 715 739



2011 2016 2021 2026 2031 2036 2066

Industry 62 70 72 73 73 73 83



Mermaid Waters Tourist (non-residential) 0 0 0 0 0 0 62

Commercial 1311 2626 2658 2663 2661 2661 2860

Industry 138 147 147 147 147 147 148



Miami Tourist (non-residential) 0 82 191 168 170 175 181

Commercial 991 995 1005 1012 1012 1012 1028

Industry 194 214 218 220 221 223 252



Coolangatta Tourist (non-residential) 1238 1243 1253 1253 1255 1267 2032

Commercial 51 51 51 51 51 51 51

Industry 23 23 23 23 23 23 23



Currumbin - Tugun Tourist (non-residential) 549 875 1601 1787 1540 1759 3086



2011 2016 2021 2026 2031 2036 2066

Commercial 450 304 310 306 307 307 380

Industry 1633 1643 1646 1647 1647 1647 1651



Currumbin Waters Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 123 102 102 102 102 102 102

Industry 899 1044 1230 1338 1388 1475 1618



Elanora Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 379 379 379 380 381 382 1291

Industry 0 0 0 0 0 0 0



Palm Beach Tourist (non-residential) 0 262 606 688 584 398 1136

Commercial 767 753 821 830 838 830 1613

Industry 8 8 8 8 8 8 8





2011 2016 2021 2026 2031 2036 2066

Arundel Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 171 160 161 162 162 162 350

Industry 1121 1331 1851 2272 2685 3119 5885



Biggera Waters Tourist (non-residential) 488 488 488 568 568 539 457

Commercial 844 948 1031 1096 1138 1182 10348

Industry 797 814 957 1026 1052 1140 1525



Parkwood Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 252 255 258 262 265 265 352

Industry 68 68 68 68 68 68 68



Coombabah Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 21 19 19 19 19 19 53

Industry 1117 1185 1241 1251 1257 1262 1487




2011 2016 2021 2026 2031 2036 2066


Labrador Tourist (non-residential) 35 326 1051 1182 1158 1041 1628

Commercial 458 446 462 468 469 470 514

Industry 67 61 61 61 61 61 61



Paradise Point - Hollywell Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 195 289 364 366 366 366 361

Industry 85 92 110 111 111 111 159



Oxenford - Maudsland Tourist (non-residential) 2147 2150 2156 2165 2165 2165 4977

Commercial 359 378 382 382 383 383 2284

Industry 43 44 44 44 44 44 44



Pimpama Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 29 44 80 213 241 282 957

Industry 10 0 0 95 104 115 373



2011 2016 2021 2026 2031 2036 2066



Upper Coomera - Willow Vale


Commercial 432 440 526 563 613 828 1385

Industry 31 274 538 805 854 992 1126



Clear Island Waters Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 76 77 79 79 79 347 348

Industry 0 0 0 0 0 0 0



Merrimac Tourist (non-residential) 0 5 18 24 24 24 1300

Commercial 65 66 67 67 68 68 95

Industry 0 0 0 0 0 0 0



Robina Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 2534 4255 5069 5817 6142 6533 14737



2011 2016 2021 2026 2031 2036 2066

Industry 166 197 269 321 395 542 855



Varsity Lakes Tourist (non-residential) 0 0 0 0 0 0 2

Commercial 222 312 407 449 450 422 10530

Industry 174 243 296 236 221 237 541



Ashmore Tourist (non-residential) 0 0 1 2 2 2 6

Commercial 609 657 714 730 733 735 1959

Industry 719 752 856 859 860 908 1013



Molendinar Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 399 299 364 402 402 403 830

Industry 1864 2145 2369 2405 2414 2572 6464



Runaway Bay Tourist (non-residential) 0 0 0 0 0 0 0



2011 2016 2021 2026 2031 2036 2066

Commercial 553 553 554 554 554 554 3119

Industry 187 187 187 187 187 187 187



Guanaba - Springbrook Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 0 0 0 0 0 0 0

Industry 0 0 0 0 0 0 0



Currumbin Valley - Tallebudgera


Commercial 74 74 111 125 128 126 121

Industry 237 237 237 237 237 237 237



Mudgeeraba - Bonogin Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 431 452 482 489 496 518 863

Industry 14 11 11 11 11 11 11





2011 2016 2021 2026 2031 2036 2066

Reedy Creek - Andrews Tourist (non-residential) 0 4 6 7 7 7 8

Commercial 23 38 38 39 39 40 49

Industry 2 3 3 3 3 3 3



Carrara Tourist (non-residential) 538 546 549 549 549 549 562

Commercial 467 570 676 730 740 740 1518

Industry 778 801 856 887 895 905 1642



Highland Park Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 222 333 363 393 359 359 769

Industry 88 0 0 0 0 0 0



Nerang - Mount Nathan Tourist (non-residential) 130 133 142 146 146 124 2

Commercial 975 987 1013 1026 1028 1348 4887

Industry 2421 2705 2752 2844 2848 2845 3733




2011 2016 2021 2026 2031 2036 2066


Pacific Pines - Gaven Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 140 181 410 521 571 577 1055

Industry 32 96 101 106 110 114 156



Worongary - Tallai Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 147 152 214 290 325 325 325

Industry 0 0 0 0 0 0 0



Coomera Tourist (non-residential) 1225 1257 1305 1347 1351 1548 8500

Commercial 127 142 319 734 1355 473 2372

Industry 456 654 1480 2166 2574 2942 4352



Helensvale Tourist (non-residential) 50 50 56 42 42 42 41

Commercial 1307 1549 1926 2318 2641 2379 7714

Industry 369 335 628 749 763 802 1015



2011 2016 2021 2026 2031 2036 2066



Hope Island Tourist (non-residential) 893 893 893 893 893 893 1168

Commercial 847 922 1104 1186 1184 1223 24023

Industry 22 22 22 22 22 22 171



Jacobs Well - Alberton Tourist (non-residential) 1 1 1 1 1 3 4

Commercial 20 44 174 339 513 699 2878

Industry 27 125 209 317 396 475 2323



Ormeau - Yatala Tourist (non-residential) 181 181 181 181 181 181 186

Commercial 791 515 538 564 594 1337 2270

Industry 13641 15461 18423 21276 23845 27162 61663



Southport Tourist (non-residential) 193 194 197 198 198 469 487

Commercial 7369 8335 9897 10275 10318 10426 17699



2011 2016 2021 2026 2031 2036 2066

Industry 1756 1855 2019 2052 2207 2294 3646



Benowa Tourist (non-residential) 1391 1391 1391 1391 1391 1391 1391

Commercial 168 179 200 207 207 207 207

Industry 0 0 0 0 0 0 0



Bundall Tourist (non-residential) 0 0 0 0 0 0 0

Commercial 1363 1705 2072 2276 2371 2430 7389

Industry 730 703 703 703 703 703 1319



Main Beach Tourist (non-residential) 2671 2701 2727 2756 2756 2772 4427

Commercial 528 849 1253 1479 1588 1734 3326

Industry 92 38 38 38 38 38 38



Surfers Paradise Tourist (non-residential) 9089 9735 11313 11604 11277 9947 9436



2011 2016 2021 2026 2031 2036 2066

Commercial 65 143 186 193 196 185 241

Industry 168 168 168 168 168 168 168



Inside priority infrastructure area (within IDM extent)

Tourist (non-residential) 22,933 25,075 28,965 29,866 29,172 28,205 45,022

Commercial 30,798 35,879 41,386 44,914 46,862 48,261 147,610

Industry 33,700 37,438 43,695 48,718 52,601 57,737 109,524

Community Purpose 24,654 24,278 36,207 39,009 41,324 42,533 55,889

Total Non-Res EP (inside PIA) 112,085 122,670 150,253 162,506 169,958 176,736 358,044

Outside priority infrastructure area (within IDM extent)


Commercial 265 266 267 269 271 274 346

Industry 119 119 119 120 124 126 198


Total Non-Res EP (outside PIA) 1,615 1,967 2,724 3,071 3,248 3,419 3,814

City of Gold Coast (within IDM extent)

Tourist (non-residential) 22,933 25,075 28,965 29,866 29,172 28,205 45,022

Commercial 31,063 36,146 41,653 45,183 47,133 48,535 147,955

Industry 33,819 37,557 43,814 48,837 52,725 57,863 109,722


Total Non-Res EP 113,700 124,637 152,978 165,577 173,206 180,155 361,858


Annexure 2: Indicative Trunk and Non-Trunk Infrastructure Specification for Water Supply and Sewerage Networks

Trunk infrastructure Non-trunk infrastructure

Water supply:

Land and/or works for:

Potable water distribution mains that serve a trunk function and have a size equal to or greater than DN200mm, or have a size less than DN200mm, but in the latter case only where providing a connecting function between other trunk infrastructure on either side of the mains

Valves and fire fighting hydrants located on trunk mains

Ground level reservoirs owned by CoGC

Elevated reservoirs owned by CoGC

Pump stations owned by CoGC

Pressure reducing valve, flow control valve and metering installations owned by CoGC

Rechlorination facilities owned by CoGC

Telemetry, monitoring, instrumentation and control systems owned by CoGC

Note: The City of Gold Coast does not own or operate potable water sources, treatment plants or bulk supply mains, with bulk potable water being supplied by SeqWater (state government entity).


Water treatment facilities not owned by CoGC or the state government

Water mains having a diameter less than DN200mm, and where not providing a connecting function between other trunk infrastructure on either side of the mains.

Meters, valves and fire hydrants located on water mains having a diameter less than DN200mm, and where the mains do not providing a connecting function between other trunk infrastructure on either side of the mains.

Any infrastructure not serving a trunk function.


Trunk infrastructure Non-trunk infrastructure

Sewerage:


Sewage Treatment Plants owned by CoGC

Sewage Release Systems owned by CoGC

Sewage Storages owned by CoGC

Gravity sewers that serve a trunk function and have a size equal to or greater than DN225mm, or have a size less than DN225mm, but in the latter case only where providing a connecting function between other trunk infrastructure on either side of the gravity sewers

Rising mains that serve a trunk function and have a size equal to or greater than DN200mm, or have a size less than DN200mm, but in the latter case only where providing a connecting function between other trunk infrastructure on either side of the rising mains

Manholes on trunk gravity sewers

Sewage pump stations owned by the CoGC

Odour control and corrosion control systems owned by the CoGC

Telemetry, monitoring, instrumentation and control systems owned by the CoGC


Sewage treatment plant systems not owned by COGC

Gravity sewers having a diameter less than DN225mm.

Rising mains having a diameter less than DN200mm.

Any infrastructure not serving a trunk function.



Sewerage Category 1 - Sewage Treatment Plants

2016 2021 2026 2031 2036 2066 TotalPimpama STP: 0Stage 2 Capacity Ugrade: 68,000EP 68,000,000 68,000,000Stage 3 Capacity Ugrade: 68,000EP 68,000,000 68,000,000Stage 4 Capacity Ugrade: 68,000EP 68,000,000 68,000,000Pimpama STP Totals 68,000,000 0 68,000,000 0 0 68,000,000 204,000,000

0Coombabah STP: 010ML Balance tank and odour control 10,000,000 10,000,000Stage 6 Capacity Upgrade: 70,000 EP (eastern side), plus Ancillary Work 74,000,000 74,000,000Stage 7 Capacity Upgrade: 70,000 EP (eastern side) 70,000,000 70,000,000Stage 8 Capacity Upgrade: 70,000EP (eastern side) 70,000,000 70,000,000Centralised Bisolids Facility Stage 2 30,000,000 30,000,000Stages 9 & 10 Capacity Upgrades: 140,000EP - western side 154,000,000 154,000,000Coombabah STP Totals 10,000,000 74,000,000 70,000,000 0 100,000,000 154,000,000 408,000,000

0Merrimac STP: 0Online upgrade: 24,500EP capacity 2,000,000 2,000,000Stage 6&7 Capacity Upgrade: 136,000EP 136,000,000 136,000,000Decomissioning Stages 1-3 7,000,000 7,000,000Stage 8 Capacity Upgrade: 68,0000EP 68,000,000 68,000,000Stage 9 Capacity Upgrade: 68,0000EP 68,000,000 68,000,000Merrimac STP Totals 0 2,000,000 143,000,000 0 68,000,000 68,000,000 281,000,000

0Elanora STP:Stage 2: Biosolids upgrade (thickening, sludge pumps & gas handling) 9,400,000Stage 3 Capacity Upgrade: 20,000EP, plus Increase in Nutrient Removal 36,000,000 36,000,000Elanora STP Totals 0 0 0 0 9,400,000 36,000,000 45,400,000

Planned STP augmentations CAPEX per horizon ($)


Sewerage Category 1 - Long Term Release Infrastructure downstream of Coombabah and Merrimac STPs

Total 12,770,000 144,423,510 12,496,000 60,117,444 0 1,000,000 230,806,954

Elanora and Merrimac $0 $18,022,848 $5,000,000 $0 $0 $0 $23,022,848

Pimpama, Coombabah and Stapylton $0 $20,321,645 $6,000,000 $45,712,885 $0 $1,000,000 $73,034,530All (not specific to North or South) $12,770,000 $106,079,017 $1,496,000 $14,404,559 $0 $0 $134,749,576

Elanora $1,565,020 $18,291,489 $1,436,096 $1,389,489 $0 $0 $14,560,492Merrimac $3,500,009 $40,974,929 $4,135,887 $4,127,512 $0 $0 $54,426,844Coombabah $6,073,817 $63,497,815 $5,074,307 $40,459,238 $0 $704,341 $113,976,130Pimpama $1,032,590 $14,910,279 $1,316,855 $9,907,298 $0 $192,330 $31,122,827Stapylton $598,564 $6,748,999 $532,856 $4,233,907 $0 $103,329 $16,720,660TOTAL $12,770,000 $144,423,510 $12,496,000 $60,117,444 $0 $1,000,000 $230,806,954

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Sewerage Category 1 - Pimpama to Coombabah Effluent Release Main

2016 2021 2026 2031 2036 2066 TotalStage 1: capacity augmentation up to 10ML/d 1,300,000 1,300,000Stage 2: capacity augmentation up to 30ML/d 16,500,000 16,500,000Stage 3: capacity augmentation up to 41ML/d 6,400,000 6,400,000Stage 4: capacity augmentation up to 54ML/d 0 3,800,000 3,800,000

1,300,000 16,500,000 6,400,000 0 0 3,800,000 28,000,000

2016 2021 2026 2031 2036 2066 TotalStapylton $477,044.67 $5,141,375 $1,843,681 $0 $0 $1,328,049 $8,790,151Pimpama $822,955.33 $11,358,625 $4,556,319 $0 $0 $2,471,951 $19,209,849Coombabah $0 $0 $0 $0 $0 $0 $0Merrimac $0 $0 $0 $0 $0 $0 $0Elanora $0 $0 $0 $0 $0 $0 $0TOTAL $1,300,000 $16,500,000 $6,400,000 $0 $0 $3,800,000 $28,000,000

Planned augmentations CAPEX per horizon ($) - from unit rate estimate based on length and diameter

Catchments CAPEX per horizon ($) - from unit rate estimate, allocated to catchments


Sewerage Category 2 Infrastructure:

• Stapylton Sewerage Catchment

• Pimpama Sewerage Catchment

• Helensvale Sewerage District

• Coombabah Sewerage District

• Merrimac East Sewerage District

• Merrimac West Sewerage District

• Elanora Sewerage Catchment


Pimpama Sewerage Catchment: Schedule of augmentations of gravity sewers

Pimpama

Reference ID Trunk infrastructure description Planning horizon (year)

Nominal diameter

(mm)

Length (m)

Average depth (m)

Establishment Cost Estimate

($ 2013)

XGMA50 225 mm gravity sewer - BEATTIE ROAD, COOMERA 2016 225 163 5.5 $680,875

XGMA51 225 mm gravity sewer - CREEK STREET, PIMPAMA 2016 225 139 1.5 $67,446

XGMA52 300 mm gravity sewer - PIMPAMA JACOBS WELL ROAD, PIMPAMA 2016 300 1003 2.6 $538,053

XGMA53 750 mm gravity sewer - FOXWELL ROAD, COOMERA 2016 750 1783 4.9 $5,670,171

XGMA54 450 mm gravity sewer - CHROME DRIVE, PIMPAMA 2016 450 1379 <1.5 $1,242,201

XGMA01 375 mm gravity sewer - OLD PACIFIC HIGHWAY, PIMPAMA 2021 375 318 5.0 $874,264

XGMA58 300 mm gravity sewer - FOXWELL ROAD, COOMERA 2021 300 826 2.0 $916,513

XGMA02 375 mm gravity sewer - CHRISTINE DRIVE, COOMERA 2026 375 562 3.3 $716,989

XGMA57 225 mm gravity sewer - BEATTIE ROAD, COOMERA 2031 225 41 >6 $344,240

XGMA03 450 mm gravity sewer - GEORGE ALEXANDER WAY, COOMERA 2036 450 1010 <1.5 $1,108,104

XGMA04 150 mm gravity sewer - RIVERMEADOWS DRIVE, UPPER COOMERA 2066 150 133 4.4 $126,256

XGMA05 150 mm gravity sewer - DAYS ROAD, UPPER COOMERA 2066 150 193 1.7 $90,495

XGMA55 225 mm gravity sewer - OAKEY CREEK ROAD, COOMERA 2066 225 42 2.4 $34,590

XGMA56 225 mm gravity sewer - CABBAGE TREE POINT ROAD, STEIGLITZ 2066 225 19 2.5 $42,079

Version 1 – November 14 TRACKS-#43873766-v5-WATER_SUPPLY_AND_SEWERAGE_INFRASTRUCTURE_PLAN_2014_-_VOLUME_1

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