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Western Irrigation Futures


Western Irrigation Futures Customer Information Sessions May 2010 Werribee Irrigation District Recycled water Currently contracted to 2019 MOU being developed with ... – PowerPoint PPT presentation

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Title: Western Irrigation Futures

Western Irrigation Futures Customer Information
Sessions May 2010 Werribee Irrigation District
Today's discussion
  • Key feedback from customer workshops and surveys
  • Key findings from WIF
  • Bulk water
  • Infrastructure options
  • Environment
  • On-farm management
  • Possible path forward
  • Water and channel system
  • Next steps
  • Customer reference group
  • Next season

WIF Atlas
Technical Workshops
Customer Consultation
Bulk Water
On farm
Draft Options Paper
Detailed Technical Work
Final Options Paper
Government / Agency consultation
Todays discussion
Customer engagement and consultation
1. Customer Feedback
What you told us you would like
  • Key Issues
  • Fit-for-purpose water
  • Sufficient volume to support historic production
  • Water at affordable price, and
  • Fix leaky channels
  • Other concerns raised
  • Farming viability
  • Agricultural practices
  • Future of the district

2. Key Findings Bulk Water
Bulk water options investigated
  • River water
  • Desalination of recycled water
  • Reverse Osmosis (RO)
  • Nanofiltration (NF)
  • Electrodialysis Reversal/Ultra Violet
  • Trading options
  • North/South pipe line
  • Macalister Irrigation District
  • Metro water
  • Water from Melbourne Pool via entitlement or
    supply agreement
  • Recycled water
  • Continuation of supply from WTP
  • Enhancements
  • Storage
  • Increased flow rates
  • Groundwater
  • Storm water harvesting

River water supply climate scenarios
Lerderderg River Seasonal Inflows (at Sardine
Salinity at Melton Reservoir and Werribee Weir
Desalination of recycled water
  • 3 technology 0ptions Investigated
  • Reverse Osmosis (RO)
  • Nanofiltration (NF)
  • Electrodialysis Reversal (EDR) and disinfection
  • Capital cost
  • based on taking salt from recycled water and
    mixing it with the standard recycled water
  • This is the cheapest option

Quality / Volume 40 ML/day 65 ML/day 90 ML/day
1,000 EC 130m 170m 170m 230m 210m 280m
1,300 EC 110m 140m 130m 180m 150m 210M
1,500 EC 90m 120m 120m 160m 140m 190m
Desalination recycled water supply cost
  • Assumptions
  • 1500EC target
  • 65ML day supplied

Supply system Efficiency per ML
No channel improvement 65 2,562
Piped channels 90 2,186
Lined channels 85 2,097
Trading options
  • North South Pipeline
  • Government committed to maximum 75,000 ML
  • Commitment to Northern Irrigators that this would
    be maximum amount
  • Option to access water from northern Victoria not
  • MID Thomson Dam
  • 11,000 ML Entitlement on key rivers in the MID
  • 30 can be transferred across the system
  • Water must be purchased and water transferred
    through district.
  • Cost to transfer is 430 per ML for 2009/10.
  • Must be delivered with another product (river /
    recycled water)

Other options
  • Groundwater
  • Fully allocated and currently not available
  • Deeper aquifer is salty and not suitable without
    high cost treatment
  • Storm water
  • MWC currently investigating storm water
    harvesting options that may provide water for
    irrigation in the long term

2. Key Findings Infrastructure Options
Infrastructure options .
  • Pipelining
  • Options investigated included piping 44 km
  • Pumped pressure pipe system, and
  • Gravity piped system
  • 44m and subject to cost escalation
  • Has a life expectancy of 80 years
  • Provides highest efficiency 90
  • Full cost recovery over 25 years

Infrastructure options .
  • Channel lining
  • Options investigated included
  • Lining with polypropylene roll out liners
  • Spray-on membrane liners
  • Life 25 years
  • Expected efficiency 85
  • Cost ranges from 16m 20m
  • Water measurement
  • Remote control regulators installed at key sites
  • Improve measurement and operation flexibility
  • Customer outlets metering to use magflow meters
  • Total cost approx 2m

2. Key Findings Environmental issues
Soil salinity..
Soil sodicity...
Soil chloride
(No Transcript)
Soil improvement outcomes
On-farm issues
  • Commercial considerations
  • Cost of production
  • Choice, mix and rotation of crop types
  • Scale of operation and constraints
  • Land values, planning regulations and impacts of
    development on farming
  • Water resource availability
  • Security of water supply to grow crops
  • Scope to reduce water use by utilising other
    irrigation methods
  • Agronomy and water quality
  • Identification and costing of best practice
    requirements for irrigation, soil salinity and
    nutrient management
  • Environmental implications
  • Understanding of potential impacts
  • Social factors
  • Social, cultural, adoption of technology,
    management practices and business decisions

3. Possible Path Forward
Possible future supply approach
  • Government announced access to 2000ML of
    Melbournes water
  • Potential to use most metro water in summer to
    reduce recycled water salinity to 1,600 ECs
  • Total flow rate increased from 60ML/d to
    approximately 80ML/d
  • Potential to bundle up and offer a shandy
    (river / recycle / metro water) product at a
    single price from 2011/12
  • Means everyone pays, everyone gets salinity
  • We would only access metro water when
  • River water allocations are low and
  • Salinity is high
  • Supply may include a mix of river water (when
    available), recycled water and potable water to
    lower salinity
  • Channel lining, metering and some automation

What does this mean for customers
  • Improved outcome
  • More water available for irrigation
  • Access to lower salinity water to improve soil
    salinity and plant health
  • Reduced application of soil conditioners and
    other additives and therefore less on farm cost
  • Potential to increased on-farm production, yield
    and crop quality
  • Long term supply contract
  • Improved viability of farming
  • Leads to environmentally sustainable outcomes for
    the district
  • The trade off
  • Higher price for recycled /metro water
  • Greater take or pay commitment

Recycled water
  • Currently contracted to 2019
  • MOU being developed with Melbourne Water
  • Revision of current agreement from 1 July 2011
    for 20 to 25 years
  • Use current base price from the recycled plant
    (continued subsidy)
  • 60 ML day flow rate 11,100ML per year contract
    volume best endeavors above that (as per now)
  • Additional costs to be paid by growers for
    significant service improvements as determined
    via regulatory processes, e.g.
  • Storage (reliability)
  • Larger pipe and pump (higher flow rates )
  • Desire for increased take or pay component
    currently 25
  • Best endeavors reliability as per now
  • Improvement options
  • Storage
  • Flow rate enhancements

Effective price comparison
Effective charges
Price make -up
  • Some price fixed
  • Other prices vary

4. Key Findings Next steps
Consultation process
  • Establish Customer Reference Groups
  • WID and BMID
  • Seek nominations
  • 1 WBMCCC for each group
  • 6 customer representatives for each group
  • Stakeholder representatives
  • Appoint independent chair
  • Terms of reference to include
  • Bulk water supply options
  • Pricing matters
  • Infrastructure issues (e.g. channels and
  • Environmental matters
  • Contract matters (recycled water, other bulk
  • How do you get onto the Customer Reference Group?

SRW in consultation with CRG
  • Finalise district strategy
  • Communicate strategy to all customers
  • Develop new customer contracts
  • Develop business case to support infrastructure
  • Implement strategy
  • Transition to new operating arrangements 2011-2013

District update
  • Recycled water supply
  • Continue supply up to 68ML day
  • River water
  • Expect minimum 6 starting allocation
  • Expect water quality to improve with increase in
  • Metro water
  • Available for next season
  • Discussion required on how this is offered
  • Delivery price in the order of 960 per ML for
  • Detail to be worked through with CRG

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