SLIDE 1
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Victorian Climate Initiative Water Corporation Perspective Jolyon - - PowerPoint PPT Presentation
Victorian Climate Initiative Water Corporation Perspective Jolyon - - PowerPoint PPT Presentation
Victorian Climate Initiative Water Corporation Perspective Jolyon Taylor Senior Water Resources Engineer www.gippswater.com.au | facebook.com/gippslandwater | twitter.com/gippswater Gippsland Waters Region
SLIDE 2
SLIDE 3
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- How does a Water
Corporation use VicCI findings?
- A major use is the 5 yearly
Urban Water Strategy (UWS).
- For this, DELWP
summarised the VicCI
- utcomes into a set of
Guidelines, with ten clear recommendations.
VicCI and Guidelines
SLIDE 4
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Water Supply - Level of Service
- Urban Water Corporation primary function is meeting customer
service obligations.
- One level of service (LOS) criteria is reliability of supply, now and
into the future, i.e. how often is supply restricted, for how long, and to what degree?
- How reliable should a water system be?
- Water Corporations are given freedom to determine acceptable LOS
in consultation with customers.
- This forms a key step in the UWS development.
- Gippsland Water’s target is 95% reliability, or water restrictions on
average once every 20 years.
SLIDE 5
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LOS and Climate
- How do we know if our systems will meet this target, now and into
the future?
- We could look at historic performance, BUT … things are changing.
- Climate
- New climate baseline.
- Possible step climate change.
- Ongoing gradual climate change.
- Infrastructure and entitlement changes.
- Changing demand levels.
- We need a water model.
SLIDE 6
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Water Model
Inflows Rules Infrastructure River (downstream uses) Demand
What should we use for inflows?
SLIDE 7
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Inflow Scenarios
- The most significant use of the
VicCI findings is in developing appropriate inflow scenarios to model.
- Using the 10
recommendations in the Guidelines, we can:
- Adjust historic streamflow records to reflect a range of possible climate
scenarios.
- Current climate.
- 3 gradual future climate scenarios (low, medium, high).
- Step climate change.
- While retaining the value of the natural variability inherent in our
historic flow records.
- This ensures we consider the impacts of both climate variability and
climate change.
SLIDE 8
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Water model results
- Running our model for the historic record period but with
adjusted inflows, we can test our systems for reliability.
- Did customers get restricted? If so…
- How often?
- How severe?
- For how long?
- Did the system meet the target LOS?
- Might it fail to meet target LOS in the future?
- Do we need to do something and when?
SLIDE 9
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Example System Forecast
SLIDE 10
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