2019-02-12 Attachment 1 to Item 3 - Stormwater Infrastructure Asset Management Plan

Figure 6: Stormwater Infrastructure Operating & Maintenance Costs & Forecast

       Asset Renewals
The purpose of developing a renewal plan is to identify assets that need to be replaced to maintain
the current level of service. Asset failure due to lack of renewal activities will affect the capacity to
deliver future renewals of Stormwater Infrastructure and subsequently the service Stormwater
Infrastructure provides to the Noosa Community. The stormwater drainage network in the coastal
area is sensitive at peak tides and significant storm events, the failure of any of those assets will
result in potential flooding of roads and property.

Stormwater Infrastructure asset renewals are condition based. Condition assessments provide staff
the ability to develop capital renewal programs. The ongoing asset management maturity and
development of the condition assessments and subsequent maintenance and renewal plans relies
heavily on the continued componentisation of all Stormwater Infrastructure assets within the
stormwater drainage network.

Renewal expenditure is work which does not increase the Stormwater Infrastructure design capacity
but restores, rehabilitates, replaces or renews an existing asset to its original service capacity.
Improved condition assessment data capture is currently being developed to include asset renewal
considerations based on physical conditions and estimates of remaining useful life of assets to guide
and improve renewal programs. Renewal plans are developed to maintain levels of service to ensure
assets achieve their optimal useful life before they reach the asset condition range of 5. Staff
continue to work through the various asset classes to develop renewal programs for the specific
asset classes. The Stormwater CCTV Inspection program will enable the development of a robust
renewal program for stormwater pipes and pits.

In the absence of condition data, an age-based approach to identify when Council’s Stormwater
Infrastructure will reach their useful life has been developed to determine anticipated renewals.
Priority is required across all the assets classes that have not had physical condition assessments
to develop a suite of renewal programs.

The graph below depicts the planned renewals by asset class over the next 10 years. There are
major renewals identified in years four, five and eight for stormwater assets, which is a direct
relationship of when initial asset data was collected and the construction dates of the assets were
estimated. It is expected that through physical condition assessments that this spike in renewals will
be better defined and spread over many years as the renewal program will be based on condition
and not remaining useful life.




Asset Management Plan: Stormwater Infrastructure                                                Page 13