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Western Irrigation Futures

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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


1
Western Irrigation Futures Customer Information
Sessions May 2010 Werribee Irrigation District
2
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

3
Recap
WIF Atlas
Technical Workshops
Customer Consultation
Bulk Water
Environment
Infrastructure
On farm
Draft Options Paper
Detailed Technical Work
Final Options Paper
Government / Agency consultation
Todays discussion
Customer engagement and consultation
4
1. Customer Feedback
5
What you told us you would like
  • Key Issues
  • Fit-for-purpose water
  • Sufficient volume to support historic production
    levels
  • Water at affordable price, and
  • Fix leaky channels
  • Other concerns raised
  • Farming viability
  • Agricultural practices
  • Future of the district

6
2. Key Findings Bulk Water
7
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

8
River water supply climate scenarios
Lerderderg River Seasonal Inflows (at Sardine
Creek)
9
Salinity at Melton Reservoir and Werribee Weir
10
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
11
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
12
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
    available
  • 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)

13
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

14
2. Key Findings Infrastructure Options
15
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

16
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

17
2. Key Findings Environmental issues
18
Soil salinity..
19
Soil sodicity...
20
Soil chloride
21
(No Transcript)
22
Soil improvement outcomes
23
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

24
3. Possible Path Forward
25
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
    benefit
  • 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

26
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

27
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

28
Effective price comparison
29
Effective charges
30
Price make -up
  • Some price fixed
  • Other prices vary

31
4. Key Findings Next steps
32
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
    storages)
  • Environmental matters
  • Contract matters (recycled water, other bulk
    supplies)
  • How do you get onto the Customer Reference Group?

33
SRW in consultation with CRG
  • Finalise district strategy
  • Communicate strategy to all customers
  • Develop new customer contracts
  • Develop business case to support infrastructure
    investment
  • Implement strategy
  • Transition to new operating arrangements 2011-2013

34
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
    allocation
  • Metro water
  • Available for next season
  • Discussion required on how this is offered
  • Delivery price in the order of 960 per ML for
    2010/11
  • Detail to be worked through with CRG

35
Questions?
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