slide 1 february 21, 2006 oakdale irrigation district water resources plan a community plan. a...
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3 The Project Team will need Board Input Throughout the PEIR Preparation Technical Analyses Institutional Activities Public Involvement Numerous issues from Phase 1 need continued Board input. Some items specifically relate to PEIR activities Other items, while not strictly tied to PEIR, need continued Board discussionTRANSCRIPT
Slide 1February 21, 2006
Oakdale Irrigation DistrictWater Resources Plan
A Community Plan. A Successful Future.
Water Supply Reliability
2
The Water Resources Plan Goals
Technical Analyses
Institutional Activities
PublicInvolvement
• Provide long-term protection to OID’s water rights.
• Address federal, state, and local water challenges.
• Rebuild/modernize an out-of-date system to meet changing customer needs.
• Develop affordable ways to finance improvements.
• Involve the public in the planning process.
3
The Project Team will need Board Input Throughout the PEIR Preparation
Technical Analyses
Institutional Activities
PublicInvolvement
• Numerous issues from Phase 1 need continued Board input.
• Some items specifically relate to PEIR activities
• Other items, while not strictly tied to PEIR, need continued Board discussion
4
Schedule of Board Involvement
Water Supply Reliability and prelude to Transfer/Annexation issues (Informational Presentation)
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What is Water Supply Reliability and Why is it Important?
“Reliability” can mean different things to different people, for example:– To all users of Stanislaus River Supplies– Reliability of Stan. River supply to OID– Reliability of OID supplies to an OID
customer Typically expressed as a % Reliability drives OID’s ability to annex new
lands and/or transfer water.
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Oakdale ID Water Supply (2004 Usage)
Stanislaus Pre-1914 Water – 257 TAF (93%) Stanislaus Post-
1914 Water – 1.3 TAF (>1%)
Groundwater – 4.4 TAF (2%)
Drainwater Reuse 13.5 TAF (5%)
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Stanislaus River Supplies to OID are Reliable – But not 100% Reliable
New Melones Reservoir constructed 1973 - 1983
1988 Agreement and Stipulation with Reclamation – OID and SSJID share the first 600 TAF of inflow
If inflow < 600 TAF, Districts share curtailments based on a formula (600 – Inflow divided by 3)
“Conserved water” up to 200 TAF but first spilled
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Computer Models are Used to Simulate Operations and Runoff
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TAF
OID Stanislaus Water Availability New Melones Inflow
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Oakdale ID Receives its Full Allocation in 61 out of 77 Years
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TAF
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TAF
1928 - 1934
246 – 300 TAF1987 - 1992
230 – 300 TAF
1977
190 TAF
Statistics Help Summarize Stan R. Reliability–Independent of Acres Irrigated
Overlaying Current Customer Demand Tells More of the Story
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0%10%20%30%40%50%60%70%80%90%100%
The expected range of OIDStanislaus River demandnot including current watertransfer obligations is 262 to299 TAF.
Overlaying Current Customer Demand Tells More of the Story
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0%10%20%30%40%50%60%70%80%90%100%
Without transfers, OID would need toaugment Stanislaus River supply withadditional sources under average ETconditions 9% of the time.
The expected range of OIDStanislaus River demandnot including current watertransfer obligations is 262 to299 TAF.
Overlaying Current Customer Demand Tells More of the Story
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0%10%20%30%40%50%60%70%80%90%100%
Without transfers, OID would need toaugment Stanislaus River supply withadditional sources under average ETconditions 9% of the time.
Without transfers, OID wouldneed to augment StanislausRiver supplies under maximumET conditions 21% of the time.
The expected range of OIDStanislaus River demandnot including current watertransfer obligations is 262 to299 TAF.
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0%10%20%30%40%50%60%70%80%90%100%
The expected range of OIDStanislaus River demandincluding minimum watertransfer obligations is 292to 329 TAF.
Overlaying all Current OID Demand for Stan. R. Water Tells the Whole Story
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0%10%20%30%40%50%60%70%80%90%100%
With minimum transferobligations and average ETconditions, OID would need toaugment Stanislaus supplies19% of the time.
The expected range of OIDStanislaus River demandincluding minimum watertransfer obligations is 292to 329 TAF.
Overlaying all Current OID Demand for Stan. R. Water Tells the Whole Story
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0%10%20%30%40%50%60%70%80%90%100%
With minimum transferobligations and average ETconditions, OID would need toaugment Stanislaus supplies19% of the time.
The expected range of OIDStanislaus River demandincluding minimum watertransfer obligations is 292to 329 TAF.
With minimum transfer obligations andmaximum ET conditions, OID wouldneed to augment their Stanislaus Riversupplies with other sources in every year.
Overlaying all Current OID Demand for Stan. R. Water Tells the Whole Story
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0%10%20%30%40%50%60%70%80%90%100%
The expected range of OIDStanislaus River demandincluding minimum watertransfer obligations is 312to 349 TAF.
What if OID Annexed 5,000 Acres Today (under current policies)?
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Conclusions (Current Land Use and Minimum Transfer Obligations)
In a maximum crop demand conditions, OID would need to augment its surface water supplies– Additional GW Pumping ($$ impact)– Reduced deliveries (modified rotations)
With average demand, OID would need to augment its surface water supplies 19% of the time
20
The Water Resources Plan Recommends Improving Current Level of Reliability
Developed conservative plan to meet worst case needs.
“Worst case” is defined as a maximum water demand condition occurring simultaneous to an extreme (5% chance of occurrence) Stanislaus River Curtailment
Strategy dependent on upcoming OID policy decisions regarding drought response, annexation, and water transfers
21
Implementing the WRP Improves Existing Customer Reliability
From an in-District grower perspective, assuming the following:– Max ET (299 TAF)– 30 TAF minimum transfer obligation– No annexations– 15 TAF of emergency pumping capability– Reduced rotations resulting in 10-14TAF in
delivery curtailments Customer reliability is 79%
Current Customer Reliability
22
Implementing the WRP Improves Existing Customer Reliability
From an in-District growers perspective, same assumptions, plus:– 5000 acres of annexations (current
policies) Maximum demand could be as high as
360 TAF (299+41+20). With current facilities, this demand
exceeds OID’s supplies
Current Customer Reliability
23
Implementing the WRP Improves Existing Customer Reliability
From an in-District growers perspective, assuming the following:– 2025 Demands (233 – 265 TAF)– 50 TAF Minimum transfer obligation– Over 4,000 acres of annexations– 20 TAF of emergency pumping capability and
increased drainwater reuse – Reduced rotations resulting in 10-14TAF in
delivery curtailments Customer reliability is 95 to 99%
Future Customer Reliability with WRP
24
OID Can’t Improve Stanislaus River Reliability, Just Customer Reliability
Customer Reliability is also affected by board policies, facilities (gw and reuse), and land use
The WRP is structured to be implemented over time Reliability improves steadily over the course of
implementation Additional water transfers and annexations need to be
carefully phased– Availability of water supply– Financing of the WRP
25
Schedule of Board Involvement
CEQAScoping Meeting
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Schedule of Board Involvement
Expansion of Service Issues (Informational Presentation) and development of Annexation Policy Guiding Principles (Board Action)
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Schedule of Board Involvement
Water Resources Planning Committee Discussion of Annexation Policy Guiding Principles
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Schedule of Board Involvement
Annexation Policy Guiding Principles Board (Board Action) and Drought Response Plan (Informational Presentation)
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Schedule of Board Involvement
1) Water Transfer Discussion to include Extension of Existing Contracts, and Potential New Recipients.
2) Confirmation of “Preferred Alternative”.
3) Infrastructure Projects and Details (Informational Presentations)
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Implementing Best Apparent Alternative Will Benefit OID’s Customers and the Community
Protect OID’s water rights. Enhance customer service for all users. Rebuild, modernize, and expand system
infrastructure. Protect the future water supply needs of the
cities of Oakdale and Riverbank. Keep water rates affordable through a
balanced effort of water transfers and service to “new” customers within OID’s Sphere of Influence.
Substantially increase water supply reliability and meet OID service in a worst-case drought.
Slide 31February 21, 2006
Oakdale Irrigation DistrictWater Resources Plan
A Community Plan. A Successful Future.
Water Supply Reliability