Transcript Request Management - Irrigation Australia

The Murrumbidgee Irrigation Area (MIA)
Infrastructure Modernisation
Key Objectives
 Improve delivery system efficiencies
 Meet changing customer needs
 Reduce asset ownership costs
 Generate water savings
 Reduce infrastructure
footprint
Lake Wyangan System
Background
 Closed system within a catchment of 7,000 ha
 Irrigation supplies to around 200 properties
 Ageing concrete-lined gravity supply channels
 Constrained system
limited to 220 ML/day
 Mix of hobby blocks,
horticulture and large area
 Social amenity provided
by Lake Wyangan
Lake Wyangan Project Area
Lake Wyangan Project
Objectives
 Replace ageing infrastructure that is at risk of failure
 Enable delivery of contracted levels of service
 Minimise the impact on water levels and water quality and
the overall environmental health of the Lake Wyangan
catchment
 Realise the estimated water
savings target for the project
Lake Wyangan Project
Options considered
 Upgrade the existing supply system
– Focus on renewal of ageing assets over water savings
 Reconfigure the existing system
– Focus on providing a secondary supply system for some areas
to address capacity constraints
 Build new assets to alleviate
requirement to upgrade some
capacity constraints
– Focus on creating new asset over
renewal of existing assets
Lake Wyangan Modernisation
Scope
 Reline and widen 15.8km of ageing concrete-lined Lake
View Branch Canal (122,000 sq. m of shotcrete lining)
 Replace open channels and pipelines at the end of their
working lives with 13.8km of GRP and PVC gravity pipelines
 Replace Dethridge wheels with electromagnetic flow
meters compliant with AS4747
 Automation of regulators and escape structures
 Install remote monitoring of flow
meters
Existing Channel Lining
Assessment of Existing Lining
Percentage of Collapsed and Failed Panels
120%
Failed Panels
Percentage of Panels
100%
Collapsed Panels
80%
60%
40%
20%
0%
1
6
11
16
21
26
31
36
Sector Number
41
46
51
56
61
Lining Design Criteria
Design Criteria
Ranking
 Convey the required flow
 Construction within winter
shutdown periods
 Reduce seepage losses
 Prevent erosion / dispersion
of soil behind lining
 Durability for 80 years
design life
 Cost-effective solution
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Fibre reinforced shotcrete
Grouted fabric mat
Shotcrete over sealed liner
Coletanche (geotextile) with
asphalt / bitumen
 Shotcrete over a flexible
membrane
 Hypalon
 HDPE
Technical Risk Reduction
Shotcrete Lining Trials
 Earthwork remediation and compaction
 Concrete mix and curing
– Unreinforced v. polymer reinforced shotcrete
 Shotcrete application
– Shotcrete lining over a geotextile
 Panel contraction and expansion
joints
 Lining detail at bank top
 Shotcrete surface finish
Channel Re-lining
Channel Re-lining
Construction Schedule
Building
relationships
Planning and
design
Construction
Testing/
Commissioning
Timing
Oct 2011– ongoing
Oct 2011 – May 2013
May 2013 –Nov 2014
Nov 2013/Nov 2014
Key steps
 Stakeholder
forums
 Planning options
 Construction:
 Acceptance
testing
 Individual face-toface meetings
 Survey and detailed
design
 Outlet designs
– Civil
– Mechanical
– Electrical
– Automation
 New system
begins operation
Lake Wyangan Modernisation
Challenges

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Forecasting future customer behaviour and intentions
Managing customer expectations
Developing and adopting new design rules
Establishing new business processes
Anticipating changes to operating
practices
 Compressed construction window
 Delivering a successful project for
MI, customers and the region
Acknowledgement
The Lake Wyangan Modernisation Project
received Australian Government funding
of $50 million through the Private
Irrigation Infrastructure Operators
Program in NSW
Thank You for Your Attention