City of Stirling Drainage Asset Managment Plan

5.4.3 Summary of asset expenditure requirements The financial projections from this

The bars in the graphs represent the anticipated budget needs required to achieve lowest lifecycle costs, the budget line indicates what is currently available. The gap between these informs the discussion on achieving the balance between services, costs and risk to achieve the best value outcome.

asset plan are shown in Figure 12 for projected operating (operations and maintenance) and capital expenditure (renewal and upgrade/expansion/new assets). Note that all costs are shown in real values.

$7,000

$6,000

$5,000

$4,000

$,000

$3,000

$2,000

$1,000

0

2019

2020

2021

2022

2023

2024

2025

2026

2027

2028

2029

2030

2031

2032

2033

2034

2035

2036

2037

2038

Year

Capital upgrade/new

Operations

Maintenance

Capital Renewal

Budgeted expenditure

Figure 12: Projected operating and capital expenditure

5.5 Disposal plan Disposal includes any activity associated with the disposal of a decommissioned asset, including sale, demolition or relocation. Assets that have been identified for possible decommissioning and disposal will be included in future revisions of this DRAMP, together with estimated annual savings resulting from not having to fund

operations and maintenance of the assets. When assets are considered for decommissioning, they are investigated to determine the required levels of service and the options available for alternate service delivery, if any. Any costs or revenue gained from asset disposals are accommodated in the Long-Term Financial Plan.

Drainage Asset Management Plan 2019 – 2029 | 29

30

6. Risk management plan

The purpose of infrastructure risk management is to document the results and recommendations resulting from the periodic identification, assessment and treatment of risks associated with providing services from infrastructure, using the fundamentals of International Standard ISO 31000:2009 Risk management – Principles and guidelines. Risk Management is defined in ISO 31000:2009 as: ‘coordinated activities to direct and control with regard to risk’ 8 . An assessment of risks 9 associated with service delivery from infrastructure assets has identified critical risks that will result in loss or reduction in service from infrastructure assets or a ‘financial shock’. The risk assessment process identifies credible risks, the likelihood of the risk event occurring and the consequences should the event occur. It further develops a risk rating, evaluates the risk and develops a risk treatment plan for non-acceptable risks. 6.1 Critical assets Critical assets are defined as those which have a high consequence of failure causing significant loss or reduction of service. Similarly, critical failure modes are those which have the highest consequences. Critical assets have been identified and their typical failure mode and the impact on service delivery are as follows: Table 6.1 Critical assets Asset at risk What can happen Risk rating Risk treatment plan Drainage pipes with high criticality value (pipe diameter greater than 1,000 mm) Pipe collapse or serviceability failure Medium CCTV survey and monitor condition

Nodes will clog with debris and cause localised flooding Failure of pits could result in flooding and water clogging in the corresponding pipes Pipe intrusion through horizontal boring, drilling and other activities by third-party utilities

Low

Bi-annual low point eduction program Routine maintenance and inspections when required ‘Dial before you dig’ check and flag

Drainage pits in low points and around trees Nodes with more than 5 pipes connected

Low

Medium

Drainage pits, pipes and underground tanks

Identifying critical assets and failure modes allows investigative activities, condition inspection programs, maintenance and capital expenditure plans to be targeted at the critical areas.

8 ISO 31000:2009, p 2 9 City of Stirling Risk Management Framework

Drainage Asset Management Plan 2019 – 2029 | 31

6.2 Risk assessment The risk management process used in this project is shown in the following Figure 13. It is an analysis and problem-solving technique designed to provide a logical process for the selection of

treatment plans and management actions to protect the community against unacceptable risks. The process is based on the fundamentals of the ISO risk assessment standard ISO 31000:2009.

Establishing the context • Define the external context • Define the internal context • Define the risk management context • Develop risk criteria

Risk Assessment

Risk identification • What can happen? (eg, the event) • How it can happen? (the causes) • What are the consequences? • Are there any other controls?

Risk analysis • Consider the effectiveness of current controls • Determine the consequence level • Determine the likelihood level • Determine the risk level

Monitoring and review

Communication and consultation

Risk evaluation • Compare risk level against criteria to determine if further treatment is required

Risk treatment • Identify treatment options • Evaluate treatment options • Select treatment options • Prepare treatment plans • Implement treatment plans

Figure 13: Risk management process

32

Critical risks are those assessed with ‘extreme’ (requiring immediate corrective action) and ‘high’ (requiring corrective action) risk ratings as identified in the Infrastructure Risk Management Plan. The residual risk and treatment cost after the selected treatment plan is implemented is shown in the following Table 6.2.1. These risks are reported to management and Council. Table 6.2.1: Critical risks and treatment plans

Risk r ating (high, extreme) Risk t reatment p lan

Service or a sset at r isk

What can h appen

Residual risk *

Drainage pits, pipes and underground tanks

Asset collapse High

Monitoring condition of assets CCTV monitoring on identified pipes Periodic reduction programs on low-point assets Annual road reserve inspections

Low

Drainage pits and structures

Pit blockage and collapse

High

Low

Gross pollutant traps

Cover collapse High

Monitoring condition of the GPT

Low

Open sumps

Personal injury High

Building fences at critical locations and monitoring the conditions

Low

Note * The residual risk is the risk remaining after the selected risk treatment plan is operational

6.3 Risk assessment matrix The risk assessment process compares the likelihood of a risk event occurring against the consequences of the event occurring. In the risk rating table below, a risk event with a likelihood of ‘possible’ and a consequence of ‘major’ has a risk rating of ‘high’. Table 6.3: Risk assessment matrix – level of risk

Consequence

Level

Insignificant

Minor

Moderate

Major

Catastrophic

Almost Certain

Extreme/ Exceptional

Extreme/ Exceptional Extreme/ Exceptional

Medium

High

High

Likely

Medium

Medium

High

High

Likelihood

Possible Unlikely

Low Low

Medium

Medium Medium

High

High High

Low Low

Medium Medium

Rare

Very low

Low

Medium

6.4 Service and risk trade-offs The decisions made in adopting this DRAMP are based on the objective of achieving the optimum benefits from the available resources. 6.4.1 What we cannot do

6.4.3 Risk trade-off The operations and maintenance activities and capital projects that cannot be undertaken may maintain or create risk consequences. These consequences include: • Increased expenses of renewal/ upgrade projects due to delays caused by the practice of deferring maintenance activities • Failure of drainage assets • Stormwater entering houses at low points. These actions and expenditures are considered in the projected expenditures, and where developed are included in the risk management plan.

6.4.2 Service trade-off Operations and maintenance activities and capital projects that cannot be undertaken will maintain or create service consequences for users. These consequences include: • Flooding issues • Infrastructure damage due to water build-up

Currently the funding allocated to meet the five-year capital upgrades plan is sufficient. However, changes in council priorities on occasion have required works to be deferred. The City’s CCTV inspection program has identified pipes requiring renewal or replacement. Due to limited funding for renewals, not all pipes can be renewed within current service levels. At this time it is not known if Stephenson Avenue Stage One drainage construction works will proceed in 2019/20. If this project proceeds, it is likely that other drainage projects will be deferred and included in subsequent capital works programs.

• Community dissatisfaction • Reduced level of service.

Drainage Asset Management Plan 2019 – 2029 | 33

34

7. Financial summary

This section contains the financial requirements resulting from all the information presented in the previous sections of this DRAMP. The financial projections will be improved as further information becomes available on desired levels of service and current and projected future asset performance.

7.1 Financial statements and projections

7.1.1 Asset valuations The best available estimate of the value of assets included in this DRAMP are shown below. Assets are valued as at 30 June 2018. Gross replacement cost

Gross Replacement Cost Gross Replacement Cost

Accumulated Depreciation A cumul Depreciation

Annual Depreciation Expense Annual Depreciation Expense

Depreciable Amount Depreciation Amount

$469,283,000

Depreciated Replacement Cost Depreciated Replacement

Depreciable amount

$469,283,000

End of reporting period 1 End of reportin period 1

Depreciated replacement cost 10

$429,650,000

End of reporting period 2 End of reporting period 2

Residual Value idual Value

Annual average asset consumption

$5,804,000

Useful Life Uselful Life

7.1.1 Sustainability of service delivery

Medium term – 10-year financial planning period This asset management plan identifies the projected operations, maintenance

Two key indicators for service delivery sustainability have been considered in the analysis of the services provided by this asset category. These are: • Asset renewal funding ratio • Medium-term budgeted expenditures/projected expenditure (over 10 years of the planning period). Asset renewal funding ratio • Asset renewal funding ratio 11 84% • The Asset Renewal Funding Ratio is the most important indicator and indicates that over the next 10 years of the forecasting that we expect to have 84 per cent of the funds required for the optimal renewal and replacement of assets.

Estimated (budget) operations, maintenance and capital renewal funding is $2,740,000 on average per year, giving a 10-year funding shortfall of $237,000 per year. This indicates 92 per cent of the projected expenditure needed to provide the services documented in this DRAMP has been accommodated in the Long-Term Financial Plan. The Long-Term Financial Plan also accommodates 99 per cent of the projected capital upgrade/new expenditure in this DRAMP over the 10-year planning period. Providing services from infrastructure in a sustainable manner requires the matching and managing of service levels, risks, projected expenditures and financing to achieve a financial indicator of approximately 1.0 for the first years of the asset management plan and ideally over the 10-year life of the Long-Term Financial Plan .

and capital renewal expenditures required to provide an agreed level of service to the community over a 10-year period. This provides input into 10-year financial and funding plans aimed at providing the required services in a sustainable manner. These projected expenditures may be compared to budgeted expenditures in the 10-year period to identify any funding shortfall. In a core asset management plan, a gap is generally due to increasing asset renewals for ageing assets. The projected operations, maintenance and capital renewal expenditure required over the 10-year planning period is $2,978,000 on average per year.

10 Also reported as written-down value, carrying or net book value.

11 AIFMM, 2015, Version 1.0, Financial Sustainability Indicator 3, Sec 2.6, p 9.

Drainage Asset Management Plan 2019 – 2029 | 35

7.1.2 Projected expenditures for Long-Term Financial Plan Table 7.1.2 shows the projected expenditures for the 10-year Long-Term Financial Plan. Expenditure projections are in 2018/19 real values. Table 7.1.2: Projected expenditures for Long-Term Financial Plan (thousands)

Year

Operations Maintenance Projected capital renewal

Capital upgrade/ new

2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038

$1,012 $1,020 $1,028 $1,035 $1,042 $1,049 $1,056 $1,063 $1,070 $1,077 $1,084 $1,091 $1,098 $1,105 $1,112 $1,119 $1,126 $1,133 $1,140 $1,147

$742 $748 $754 $759 $764 $769 $774 $779 $784 $789 $795 $800 $805 $810 $815 $820 $825 $831 $836 $841

$1,064 $1,100 $1,500 $1,500 $1,500 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000 $1,000

$3,841 $3,450 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250 $3,250

7.2 Funding strategy Funding for assets is provided from the budget and Long-Term Financial Plan. The financial strategy of the entity determines how funding will be provided, whereas the asset management plan communicates how and when this will be spent, along with the service and risk consequences of differing options. 7.3 Valuation f orecasts Asset values are forecast to increase as additional assets are added. Additional assets will generally add to the operations and maintenance needs in the longer term, as well as the need for future renewal. Additional assets will also add to future depreciation forecasts.

7.4 Key assumptions made in financial forecasts This section details the key assumptions made in presenting the information contained in this asset management plan. It is presented to enable readers to gain an understanding of the levels of confidence in the data behind the financial forecasts. Key assumptions made in this DRAMP are: • Data in the asset registers are accurate • The rates used for costing of capital treatments are accurate.

36

7.5 Forecast reliability and confidence The expenditure and valuations projections in this DRAMP ar e based on best available data. Currency and accuracy of data is critical to effective asset and financial management. Data confidence is classified on a five-level scale 12 in accordance with Table 7.5. Table 7.5: Data confidence grading system Confidence g rade Description A Highly reliable Data based on sound records, procedures, investigations and analysis, documented properly and agreed as the best method of assessment. Dataset is complete and estimated to be accurate ± 2% B Reliable Data based on sound records, procedures, investigations and analysis, documented properly but has minor shortcomings, eg, some of the data is old, some documentation is missing and/or reliance is placed on unconfirmed reports or some extrapolation. Dataset is complete and estimated to be accurate ± 10% Data based on sound records, procedures, investigations and analysis which is incomplete or unsupported, or extrapolated from a limited sample for which grade A or B data are available. Dataset is substantially complete but up to 50% is extrapolated data and accuracy estimated ± 25% D Very uncertain Data is based on unconfirmed verbal reports and/or cursory inspections and analysis. Dataset may not be fully complete and most data is estimated or extrapolated. Accuracy ± 40% E Unknown None or very little data held The estimated confidence level for and reliability of data used in this DRAMP is shown in the following Table 7.5.1. C Uncertain

Table 7.5.1 Data confidence grading system

Confidence assessment

Data

Comment

Demand drivers

Reliable

Based on the City Strategic Community Plan 2016 -2026, population change is measured and updated

Growth projections

Reliable Reliable Reliable Reliable

Based on historical records of growth Sourced from the finance system Sourced from the finance system

Operations expenditures

Maintenance expenditures

Projected renewal expenditures Asset values

Based on 2017 comprehensive asset valuation for drainage assets

Asset useful lives

Certain

Useful lives are within industry standard

Condition modelling

Uncertain

Coarse condition data based on age, location and soil type. Program requires validation

Portfolio renewals

Reliable

Based on 2018/19 budget

Upgrade/new expenditures

Uncertain

Based on planned project data and requires validation

Disposal expenditures Based on planned project data The estimated confidence level for and reliability of data used in this DRAMP is considered to be medium. Reliable

12 IPWEA, 2015, IIMM, Table 2.4.6, p 2| 71 .

Drainage Asset Management Plan 2019 – 2029 | 37

38

8. Plan improvement and monitoring

8.1 Status of asset management practices 13 8.1.1 Accounting and financial data sources Accountabilities for financial systems The City’s utilises the FinanceOne application by TechnologyOne for tracking budgets and financial reporting. Accounting standards and regulations Accounting standards and regulations applicable to the City include: • WA Local Government Act 1995 • WA Local Government (Financial Management) Regulations 1996 • AASB 116 Property, Plant and Equipment • AASB 13 Fair Value Measurement. Capitalisation threshold The capitalisation thresholds for each financial asset class are shown in Table 8.1.1 below.

8.1.2 Asset management data sources The City has several systems that, when combined, improve the effective management of assets. These are: • Works and Assets – holds the asset register containing inventory, condition and historical data of assets. It is also used in managing projects, creating job priorities, maintenance schedules, work orders and tracking status • Intramaps GIS – holds the location of all assets • Assetic MyData – financial asset reporting tool • FinanceOne – contains the fixed asset register, tracking budgets and accessing financial data • Property Ci – allows the logging and processing of customer requests. Linkage from asset management to financial system Financial asset data is recorded in Assetic MyData and then recorded at a financial asset-class level in the financial system. Accountabilities for asset management system and data maintenance Processes have been established to ensure that data in the asset management systems are up-to-date. Required changes to asset management system arising from this DRAMP As a result of this asset management plan, the following changes are proposed for the asset management system: • A review of the maintenance management system for works-planning and asset-reporting improvements • Associating customer requests with specific assets.

Table 8.1.1: Capitalisation threshold table

Capitalisation threshold

Fixed asset classification

Land

$1

Building

$5,000 $5,000 $5,000 $5,000 $5,000 $5,000 $50,000

Plant and equipment

Mobile vehicles and plant

Furniture and office equipment

Recreation equipment

Infrastructure

Software

Required changes to accounting financial systems arising from this DRAMP A review of the financial system has arisen from this asset management plan to improve the reporting of renewal/upgrade/new asset capital expenditure, reactive and planned maintenance, and operating expenditure.

13 ISO 55000 Refers to this as the asset management system

Drainage Asset Management Plan 2019 – 2029 | 39

8.2 Improvement Plan Figure 14 below shows the current status of the City’s drainage asset management. The asset management improvement plan generated from this DRAMP is shown in the following Table 8.2.

0 10 20 30 40 50 60 70

80

90

100

Knowledge of asset and data management

Levels of service specification and measurements

Asset condition performance/monitoring strategies Asset creation and acquisition process Demand management Works/project management Asset valuation, depreciation and useful lives Asset management plan Asset operation and maintenance Risk management Funding strategies Quality management Improvement planning Asset ownership Asset rehabilitation/renewal strategies Asset disposal/rationalisation Asset register system Works management system Asset financial system Asset management system Customer management system Spatial mapping system

Current

12 month target

Long-term

Figure 14: Stormwater asset management gap analysis

40

Table 8.2: Improvement plan

Task no Task

Responsibility

Resources required Timeline

1 Review stormwater assets renewal modelling inputs – Useful life, unit rates, deterioration patterns 2 Update stormwater assets register with required data – Relining history, structural condition, asbestos 3 Review the reliability of the coarse condition assessment 4 Review customer and works management information systems for better performance reporting and planning

Asset management services

Engineering services 2025

Asset management services

Engineering services Corporate information systems

2021

Asset management services Asset management services Corporate information systems Asset management services Asset management services Asset management services Finance services

Engineering services

2022

Engineering services Customer and communications

2022

5 Identify and map flood-prone and flood-risk areas

Engineering services 2024

6 Review drainage asset criticality rating

Engineering services 2023

7 Improve the linkage to the Long-Term Financial Plan

Engineering services 2021

8.3 Monitoring and

8.4 Performance measures The effectiveness of the asset management plan can be measured in the following ways: • The degree to which the required projected expenditures identified in this asset management plan are incorporated into the Long- Term Financial Plan • The degree to which one-year to five-year detailed works programs, budgets, business plans and corporate structures take into account the ‘global’ works program trends provided by the asset management plan • The degree to which the existing and projected service levels and service consequences (what we cannot do), risks and residual risks are incorporated into the strategic community plan and associated plans • The asset renewal funding ratio achieving the target of 1.0.

review procedures The DRAMP has a life of four years. This DRAMP will be reviewed during annual budget planning processes and amended to show any material changes in service levels and/or resources available to provide those services as a result of budget decisions.

Drainage Asset Management Plan 2019 – 2029 | 41

9.References

• IPWEA, 2006, ‘International Infrastructure Management Manual’, Institute of Public Works Engineering Australasia, Sydney, www.ipwea.org/IIMM • IPWEA, 2008, ‘NAMS.PLUS Asset Management’, Institute of Public Works Engineering Australasia, Sydney, www.ipwea.org/namsplus. • IPWEA, 2015, 2nd edn., ‘Australian Infrastructure Financial Management Manual’, Institute of Public Works Engineering Australasia, Sydney, www.ipwea.org/AIFMM. • IPWEA, 2015, 3rd edn., ‘International Infrastructure Management Manual’, Institute of Public Works Engineering Australasia, Sydney, www.ipwea.org/IIMM • IPWEA, 2012 LTFP Practice Note 6 PN Long-Term Financial Plan, Institute of Public Works Engineering Australasia, Sydney

42

10. Appendices

Appendix A Projected 10-year drainage pipes capital renewal and replacement works model Appendix B Projected 10-year drainage pipes capital renewal and replacement works model map Appendix C Projected 10-year drainage nodes capital renewal and replacement model program Appendix D Projected 10-year drainage nodes capital renewal and replacement works model map Appendix E Projected four-year drainage capital upgrade/expansion/ new works program

Drainage Asset Management Plan 2019 – 2029 | 43

Appendix A: Projected 10-year drainage pipes capital renewal and replacement works model

Year

Suburb

Treatment

Length(m) Estimated cost

2020/21 Balcatta

Pipe relining 62.2

$25,509.67

2020/21 Balga

Pipe relining 19.6

$3,535.05

2020/21 Carine

Pipe relining 62

$15,056.31 $10,154.26 $7,214.39 $3,506.45 $33,434.33 $63,578.80 $142,569.78

2020/21 Coolbinia

Pipe relining 56.3

2020/21 Innaloo

Pipe relining 40

2020/21 North Beach

Pipe relining 11.8

2020/21 Osborne Park

Pipe relining 156.9 Pipe relining 305.6 Pipe relining 184.2

2020/21 Scarborough

2020/21 Stirling

2020/21 Trigg

Pipe relining 30.3

$5,464.90

2020/21 Watermans Bay Pipe relining 216.9 2020/21 Wembley Downs Pipe relining 305.1

$41,109.70

$129,018.13

2020/21 Woodlands

Pipe relining 36.8 Pipe relining 54.4

$6,637.24

2020/21 Yokine

$13,210.70

 Total

1542.1

$499,999.71 $86,897.44 $16,412.74 $38,243.72 $6,835.64 $5,194.36 $6,572.31 $58,322.94 $18,631.16 $54,042.60 $47,832.44 $39,370.25 $12,643.68 $77,122.80 $29,593.47 $1,803.60

2021/22 Balcatta

Pipe relining 104.7

2021/22 Balga

Pipe relining 91

2021/22 Dianella

Pipe relining 154.7

2021/22 Hamersley 2021/22 Inglewood

Pipe relining 37.9 Pipe relining 28.8 Pipe relining 36.44 Pipe relining 323.37

2021/22 Innaloo

2021/22 Karrinyup

2021/22 Mount Lawley

Pipe relining 103.3

2021/22 North Beach

Pipe relining 10

2021/22 Osborne Park

Pipe relining 170.6 Pipe relining 235.1

2021/22 Scarborough

2021/22 Trigg

Pipe relining 90

2021/22 Watermans Bay Pipe relining 43

2021/22 Wembley Downs Pipe relining 363.8

2021/22 Yokine

Pipe relining 122.3

 Total

1915.01 $499,519.15

44

Year

Suburb

Treatment

Length(m) Estimated cost

2022/23 Balcatta

Pipe relining 70

$16,999.06

2022/23 Balga

Pipe relining 46.7 Pipe relining 33.6 Pipe relining 26.5

$8,422.80

2022/23 Carine

$26,484.83

2022/23 Dianella

$4,779.53

2022/23 Hamersley

Pipe relining 142.7

$48,085.66 $16,232.38 $16,683.28 $23,262.04 $31,973.26

2022/23 Innaloo

Pipe relining 90

2022/23 Karrinyup

Pipe relining 92.5 Pipe relining 97.9 Pipe relining 101.1

2022/23 Menora

2022/23 Mount Lawley

2022/23 North Beach

Pipe relining 33.3

$7,124.44

2022/23 Nollamara

Pipe relining 67

$18,406.35

2022/23 Osborne Park

Pipe relining 325.3 Pipe relining 185.4 Pipe relining 54.4 Pipe relining 77.3

$131,183.95

2022/23 Scarborough

$34,101.03

2022/23 Trigg

$9,811.57

2022/23 Tuart Hill

$13,941.81

2022/23 Watermans Bay Pipe relining 20.2 2022/23 Wembley Downs Pipe relining 33.2

$3,643.27 $5,987.94 $82,513.76 $499,636.97 $67,619.99 $32,193.22 $99,975.54 $44,402.67 $55,552.41 $99,955.08 $99,974.59 $99,974.59 $57,171.93 $42,814.51 $99,986.44 $24,745.36 $75,227.25 $99,972.61 $49,109.63 $50,884.56 $99,994.19 $91,745.01 $162.32

2022/23 Yokine

Pipe relining 325.7

Total

1822.8

2023/24 Balcatta

Pipe relining 213.7 Pipe relining 117.6

2023/24 Inglewood

2023/24 Mount Lawley Pipe relining 0.9

Total

 332.2

2024/25 Inglewood

Pipe relining 244.7

2024/25 Mount Lawley Pipe relining 190.4

Total

435.1

2025/26 Inglewood

Pipe relining 497.5

Total

497.5

2026/27 Inglewood

Pipe relining 289.2

2026/27 Mount Lawley Pipe relining 158.5

Total

 447.7

2027/28 Inglewood

Pipe relining 137.2

2027/28 Mount Lawley Pipe relining 239.4

Total

376.6

2028/29 Inglewood

Pipe relining 253.4

2028/29 Mount Lawley Pipe relining 225.2

 Total

478.6

2029/30 Inglewood

Pipe relining 423.1

2029/30 Mount Lawley Pipe relining 39

$7,649.85

Total

462.1

$99,394.86

Drainage Asset Management Plan 2019 – 2029 | 45

Appendix B : Projected 10 - year drainage pipes capital renewal and replacement works model map

46

Appendix C: Projected 10-year drainage nodes capital renewal and replacement works model

Treatment name

Estimated cost $25,021.65 $129,281.76 $16,326.99 $13,194.24 $11,827.42 $5,579.19 $4,398.08 $4,398.08 $30,786.56 $8,796.16 $249,610.13 $4,398.08 $29,958.77 $8,796.16 $5,579.19 $33,705.13 $8,796.16 $14,858.67 $12,530.87 $4,398.08 $8,796.16 $4,398.08 $6,171.56 $15,592.91 $4,398.08 $4,937.11 $4,398.08 $5,579.19

Treatment name

Estimated cost $4,398.08 $12,668.19 $9,375.31 $9,977.27 $5,579.19 $17,026.15 $18,849.34 $16,148.83 $14,375.35 $35,358.25 $4,398.08 $15,381.92 $30,265.43 $5,579.19 $22,343.72 $27,899.58 $249,623.90 $9,335.19 $22,240.67 $4,398.08 $72,240.77 $5,579.19 $4,937.11 $29,289.73 $16,737.58 $5,579.19 $4,398.08 $22,316.77 $5,579.19 $47,026.34 $249,657.90 $4,937.11 $24,685.56 $24,685.56 $4,937.11 $34,559.79 $49,371.13 $2,553.60 $14,811.34 $4,937.11

Year

Suburb

Year

Suburb

2023/24 Balga 2023/24 Dianella

Node renewal Node renewal

2020/21 Carine 2020/21 Dianella

Node renewal Node renewal

2023/24 Inglewood Node renewal

2020/21 Doubleview Node renewal 2020/21 Inglewood Node renewal

2023/24 Karrinyup 2023/24 Menora

Node renewal Node renewal

2020/21 Innaloo 2020/21 Menora

Node renewal Node renewal

2023/24 Mount Lawley Node renewal 2023/24 Osborne Park Node renewal 2023/24 Scarborough Node renewal

2020/21 Mount Lawley Node renewal 2020/21 Nollamara Node renewal 2020/21 North Beach Node renewal 2020/21 Osborne Park Node renewal 2020/21 Scarborough Node renewal

2023/24 Westminster

Node renewal Node renewal

2023/24 Yokine

 Total

2024/25 Balcatta 2024/25 Balga 2024/25 Carine 2024/25 Coolbinia 2024/25 Dianella

Node renewal Node renewal Node renewal Node renewal Node renewal

2020/21 Stirling 2020/21 Tuart Hill 2020/21 Wembley Downs 2020/21 Westminster

Node renewal Node renewal Node renewal Node renewal Node renewal Node renewal Node renewal Node renewal Node renewal Total

2020/21 Yokine

2024/25 Doubleview Node renewal 2024/25 Hamersley Node renewal 2024/25 Inglewood Node renewal

2021/22 Balcatta 2021/22 Balga 2021/22 Carine 2021/22 Dianella

2024/25 Innaloo 2024/25 Karrinyup 2024/25 Menora

Node renewal Node renewal Node renewal

2021/22 Doubleview Node renewal 2021/22 Hamersley Node renewal 2021/22 Inglewood Node renewal 2021/22 Mount Lawley Node renewal 2021/22 Nollamara Node renewal 2021/22 Osborne Park Node renewal 2021/22 Innaloo Node renewal

2024/25 Mirrabooka Node renewal 2024/25 Mount Lawley Node renewal 2024/25 Osborne Park Node renewal 2024/25 Scarborough Node renewal

2024/25 Stirling 2024/25 Tuart Hill 2024/25 Wembley Downs 2024/25 Westminster

Node renewal Node renewal

Node renewal

$4,977.23

2021/22 Stirling

Node renewal Node renewal

Node renewal Node renewal

$53,480.47 $13,194.24 $248,944.22

2021/22 Westminster

2024/25 Yokine

 Total

 Total

2022/23 Balcatta 2022/23 Balga 2022/23 Carine

Node renewal Node renewal Node renewal

2022/23 Glendalough Node renewal 2022/23 Hamersley Node renewal 2022/23 Mirrabooka Node renewal 2022/23 Mount Lawley Node renewal 2022/23 Osborne Park Node renewal

2022/23 Watermans Bay 2022/23 Wembley Downs 2022/23 Westminster

Node renewal

Node renewal

$14,811.34

Node renewal

$69,119.58 $249,409.23

Total

Drainage Asset Management Plan 2019 – 2029 | 47

Treatment name

Estimated cost $27,569.59 $4,398.08 $4,398.08 $71,550.38 $8,796.16 $40,070.90 $8,796.16 $4,398.08 $43,126.05 $4,398.08 $28,052.91 $4,398.08 $249,952.54 $4,398.08 $63,935.34 $27,569.59 $4,398.08 $8,796.16 $33,125.98 $4,398.08 $18,773.43 $19,954.54 $26,112.89 $38,477.52 $249,939.68

Treatment name

Estimated cost $9,977.27 $26,388.48 $4,398.08 $4,398.08 $24,307.01 $18,131.35 $47,554.44 $13,194.24 $9,375.31 $5,579.19 $9,977.27 $5,579.19 $14,375.35 $4,937.11 $11,158.38 $4,398.08 $4,398.08 $31,864.62 $249,991.54 $21,804.69 $22,569.55 $37,524.06 $4,398.08 $8,796.16 $14,954.51 $4,398.08 $4,398.08 $23,057.73 $21,804.69 $33,148.78 $13,773.39 $5,579.19 $9,977.27 $8,796.16 $14,954.51 $249,934.92 $35,184.63 $55,622.50 $13,194.24 $23,750.66 $4,398.08 $39,582.71 $17,592.32 $8,796.16 $19,954.54 $4,398.08 $11,158.38 $11,827.42 $4,398.08 $249,857.81

Year

Suburb

Year

Suburb

2028/29 Balcatta 2028/29 Balga

Node renewal Node renewal

2025/26 Balcatta 2025/26 Balga 2025/26 Carine 2025/26 Coolbinia 2025/26 Dianella

Node renewal Node renewal Node renewal Node renewal Node renewal

2028/29 Churchlands Node renewal

2028/29 Dianella

Node renewal

2028/29 Doubleview Node renewal 2028/29 Inglewood Node renewal

2025/26 Hamersley Node renewal 2025/26 Inglewood Node renewal

2028/29 Karrinyup

Node renewal

2028/29 Mount Lawley Node renewal 2028/29 Nollamara Node renewal 2028/29 Scarborough Node renewal

2025/26 Karrinyup 2025/26 Menora

Node renewal Node renewal

2025/26 Mount Lawley Node renewal 2025/26 Nollamara Node renewal 2025/26 Osborne Park Node renewal 2025/26 Scarborough Node renewal

2028/29 Westminster

Node renewal

2028/29 Woodlands Node renewal

Total

2029/30 Balcatta 2029/30 Balga 2029/30 Dianella

Node renewal Node renewal Node renewal

2025/26 Stirling 2025/26 Tuart Hill 2025/26 Wembley Downs

Node renewal Node renewal Node renewal

2029/30 Doubleview Node renewal 2029/30 Hamersley Node renewal 2029/30 Inglewood Node renewal

2025/26 Woodlands Node renewal

2025/26 Yokine

Node renewal

 Total

2029/30 Innaloo 2029/30 Karrinyup

Node renewal Node renewal

2026/27 Balcatta 2026/27 Balga 2026/27 Dianella 2026/27 Gwelup

Node renewal Node renewal Node renewal Node renewal

2029/30 Mount Lawley Node renewal 2029/30 Nollamara Node renewal

2029/30 Westminster

Node renewal

2026/27 Hamersley Node renewal 2026/27 Inglewood Node renewal

Total

2026/27 Innaloo 2026/27 Karrinyup 2026/27 Menora

Node renewal Node renewal Node renewal

2026/27 Mount Lawley Node renewal 2026/27 Nollamara Node renewal 2026/27 Scarborough Node renewal

2026/27 Stirling 2026/27 Tuart Hill 2026/27 Westminster

Node renewal Node renewal Node renewal Node renewal Node renewal Node renewal Node renewal Node renewal  Total

2026/27 Yokine

2027/28 Balcatta 2027/28 Balga 2027/28 Carine 2027/28 Dianella

2027/28 Doubleview Node renewal 2027/28 Hamersley Node renewal 2027/28 Inglewood Node renewal 2027/28 Mount Lawley Node renewal 2027/28 Nollamara Node renewal 2027/28 Scarborough Node renewal 2027/28 Innaloo Node renewal

2027/28 Westminster

Node renewal Node renewal

2027/28 Yokine

Total

48

Appendix D: Projected 10- year drainage nodes capital renewal and replacement works model map

Drainage Asset Management Plan 2019 – 2029 | 49

Appendix E: Projected four year drainage capital upgrade/expansion/new works program Potential upgrade, expansion and new capital works for 2019/20 to 2022/23:

2019/20 project description 2020 As constructed survey 2020 minor drainage works

Ward

Estimated cost

Coastal Coastal Lawley Osborne Coastal

$80,000 $100,000 $650,000 $80,000 $790,000 $290,000 $500,000 $310,000 $650,000 $50,000 $100,000 $120,000 $510,000 $300,000 $300,000 $30,000 $462,000 $500,000 $500,000 $100,000 $100,000 $30,000 $60,000 $3,162,000 $50,000 $100,000 $120,000 $200,000 $150,000 $200,000 $1,500,000 $2,320,000

Central Avenue UGDB, Mount Lawley Cervara Road Drainage, Stirling

Colin Road, Wembley Downs Monyash Road HN82A, Carine

Hamersley

Radalj Place, Balcatta

Osborne

Swan Street/Hayes Avenue roundabout Drainage, Yokine Lawley

Twyford Place drainage outlet, Innaloo

Doubleview

Total estimated cost

$3,450,000

2020/21 project description 2021 as constructed survey

Ward

Estimated cost

Coastal Coastal Coastal

2021 coastal outfalls improvement program

2021 minor drainage works

Alice Street (Beatrice-Moorland), Doubleview Alvan St and Queens Crescent, Mt Lawley

Doubleview

Lawley

Bader Way, Balcatta Bandy Park, Coolbinia Eton Street, Joondanna

Osborne

Lawley

Osborne

Fourth Avenue HN 4 Stage 4 (Railway Pde, N of Central)

Lawley

Howie Street, Woodlands

Doubleview

Kweda Way Stage 2, Nollamara

Lawley

Queenscliffe Road (Ryndle-Coronation), Doubleview Roberts Street (Albert-Mitchell Fwy), Osborne Park

Doubleview Osborne Inglewood

Roelands Place, Dianella Total estimated cost

2021/22 project description 2022 as constructed survey

Ward

Estimated cost

Coastal Coastal Coastal Lawley Lawley Osborne

2022 coastal outfalls improvement program

2022 minor drainage works Fifth Avenue and Faull Park

John Street (Fourth – Fifth), Mt Lawley

Selby Street North (SBR-Pearson), Osborne Park

Shearn Crescent Stage 2, Doubleview

Doubleview

Total estimated cost

2022/23 project description 2023 as constructed sSurvey

Ward

Estimated cost

Coastal Coastal Coastal Coastal Osborne Osborne

$50,000 $100,000 $120,000 $450,000 $33,000 $500,000

2023 coastal outfalls improvement program

2023 minor drainage works

Southbourne Street, Scarborough

Telford Crescent (Newcomen – Talia), Stirling Waterloo Street/Moldavia Street, Tuart Hill

Total estimated cost 

$1,253,000

50

Drainage Asset Management Plan 2019 – 2029 | 51

Administration Centre 25 Cedric Street Stirling WA 6021 Telephone (08) 9205 8555 Enquiries www.stirling.wa.gov.au/enquiries Web www.stirling.wa.gov.au | /citystirlingwa This information is available in alternative formats on request. Please contact the Customer Contact Centre on (08) 9205 8555.