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February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability

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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 discussion

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Page 1: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

Slide 1February 21, 2006

Oakdale Irrigation DistrictWater Resources Plan

A Community Plan. A Successful Future.

Water Supply Reliability

Page 2: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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• Rebuild/modernize an out-of-date system to meet changing customer needs.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.

Page 3: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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

Page 4: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

4

Schedule of Board Involvement

Water Supply Reliability and prelude to Transfer/Annexation issues (Informational Presentation)

Page 5: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

5

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.

Page 6: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

6

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%)

Page 7: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

7

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

Page 8: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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Computer Models are Used to Simulate Operations and Runoff

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OID Stanislaus Water Availability New Melones Inflow

Page 9: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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Oakdale ID Receives its Full Allocation in 61 out of 77 Years

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Page 10: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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1928 - 1934

246 – 300 TAF1987 - 1992

230 – 300 TAF

1977

190 TAF

Page 11: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

Statistics Help Summarize Stan R. Reliability–Independent of Acres Irrigated

Page 12: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

Overlaying Current Customer Demand Tells More of the Story

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The expected range of OIDStanislaus River demandnot including current watertransfer obligations is 262 to299 TAF.

Page 13: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

Overlaying Current Customer Demand Tells More of the Story

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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.

Page 14: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

Overlaying Current Customer Demand Tells More of the Story

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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.

Page 15: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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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

Page 16: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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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

Page 17: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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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

Page 18: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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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)?

Page 19: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

19

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

Page 20: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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

Page 21: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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

Page 22: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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

Page 23: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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

Page 24: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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

Page 25: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

25

Schedule of Board Involvement

CEQAScoping Meeting

Page 26: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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Schedule of Board Involvement

Expansion of Service Issues (Informational Presentation) and development of Annexation Policy Guiding Principles (Board Action)

Page 27: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

27

Schedule of Board Involvement

Water Resources Planning Committee Discussion of Annexation Policy Guiding Principles

Page 28: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

28

Schedule of Board Involvement

Annexation Policy Guiding Principles Board (Board Action) and Drought Response Plan (Informational Presentation)

Page 29: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

29

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)

Page 30: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

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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.

Page 31: Slide 1 February 21, 2006 Oakdale Irrigation District Water Resources Plan A Community Plan. A Successful Future. Water Supply Reliability Oakdale Irrigation

Slide 31February 21, 2006

Oakdale Irrigation DistrictWater Resources Plan

A Community Plan. A Successful Future.

Water Supply Reliability