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

It is Council Policy that any change in the level of service due to demand is reported to Council in
accordance with current guidelines and practices.

The major drivers of capital upgrade for Stormwater Infrastructure will be:
    external funding opportunities to improve trunk networks,
    risk management – including Flooding and safety,
    changes to density of dwellings on lots (bigger houses on smaller lots),
    climate change adaptation,
    environmental and river management initiatives,
    flood mitigation,
    changes in technologies,
    Impacts on operational and maintenance activities.

The various and regular Stormwater Infrastructure inspection programs will act as a trigger for any
need to improve on preventative maintenance activities to preserve the life of the assets. The
development of a stormwater maintenance program/plan to record known issues and areas that
require attention prior and during storm seasons will create greater efficiencies and ensure there is
no loss of technical and maintenance knowledge of the stormwater infrastructure in to the future.

In addition, trials with new technology are being considered to reduce litter and pollutants entering
downstream waterways and thus improve water quality. These trials have the potential to determine
the priority of upgrade works required or as a minimum, identify the feasibility of retrofitting devices
on these assets in the future.



       Demand Impacts on Assets
There are particular areas of Council’s stormwater network that are sensitive during peak rainfall
events. This is predominately in low lying and tidal areas. Continued monitoring of these assets
during these periods to determine any potential remediation works and aided by climate change
adaption initiatives to improve water quality of the receiving waters in future.

Other demand impacts on the stormwater network relate to periods of scheduled works for asset
repairs/refurbishment or maintenance works. These scheduled activities should ideally be
undertaken outside of the wetter seasons to minimise impacts of stormwater within the proximity of
works.



       Climate Change Adaptation
Climate Change Adaptation initiatives will be another demand driver that will affect assets that are
located in coastal and foreshore areas. Current and expected future extents of shoreline recession,
storm erosion, storm-tide, and permanent tidal water extents must be taken into consideration in the
design of future upgrades for those affected assets.

Affected assets can be identified in the new coastal hazard layers created as part of Council’s
development of a Climate Change Adaptation Plan and viewed on Intramaps. These coastal hazard
layers are located in the Development Assessment module, under the ‘Coastal Hazards’ folder.
Consideration of future climate risks is most critical for long-lived assets, such as stormwater
infrastructure. Therefore, a tidal waters extent vulnerability assessment for stormwater assets that
takes into account projected expansion of tidal water extents is required (NB: assessment already
underway, and expected mid2019). Consultation with Council’s Program Coordinator - Climate
Change Adaptation should be undertaken when considering any renewal or upgrade of assets within
these zones.


Asset Management Plan: Stormwater Infrastructure                                                 Page 7