Sacramento Regional Water Bank The region has already seen success - - PowerPoint PPT Presentation

Im Improving Water Supply Reliability through the

Sacramento Regional Water Bank

The region has already seen success from conjunctive use

North American Subbasin South American Subbasin

Despite this success, we can’t ignore longer-term changes in hydrology In fact, SGMA compels us to take the long view

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Folsom Lake Reservoir Level (acre-feet) Water Year (WY) (October 1 - September 30)

Folsom Lake Storage Levels

Historical Average Recent Average (WY 2001 - Current)

Total Reservoir Capacity: 977,000 acre-feet

It seems that we have plenty of conjunctive use potential

Still have plenty of existing groundwater use to offset

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

In excess of 1.8 million AF available storage space

Conjunctive use analysis was performed for agencies overlying the groundwater basin and contiguous with each other

Two fundamental questions

1. What we can do today by reoperating existing system? 2. What we can do over next 10 years with new facilities added to system?

Constraints Considered:

• Whether or not systems fluoridate
• Water rights/contracts
• Surface water treatment plant capacity
• Conveyance/intertie capacity
• Groundwater production capacity
• Operational issues identified by purveyors

Constraint Not Considered:

• Cost of water

Area 1 Area 2 Area 4 Area 3

Recharge Potential Recovery Potential

31% 69%

Actual (2011-13 Average)

Surface Water Groundwater

86% 14%

Potential (2011-13 Average)

Surface Water Groundwater

36% 64%

Actual (2015)

Surface Water Groundwater

42% 58%

Potential (2015)

Surface Water Groundwater

We have conjunctive use potential, but we still lack incentive to act further

Opportunities Barriers

• For existing system, reoperations

cost differential is in excess of $300 per acre-foot

• For new facilities, capital costs

estimated at about $288 million

(Wet Year) (Dry Year)

With Existing System With Near- Term New Facilities

Developing a Water Bank can help incentivize expanding conjunctive use and ensure future sustainability

• Multi-year storage (“long-term market”) of

Central Valley Project contract water for internal

• r external partners
• Storage before recovery
• Loss factor over length of storage
• Monitoring and mitigation
• Single year transfers (“spot market”) by

using groundwater in place of an existing surface water right

• Storage before recovery not required
• One-time loss factor at time of transfer
• Monitoring and mitigation

Following groundwater banking guidelines can help ensure success under SGMA

A 2018 pilot proved our ability to work together and understand many of the mechanisms of a Water Bank

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MW - Chuckwagon

Transfer Period

60 Production Wells 20 Monitoring Wells

The 2018 pilot showed the positive results of agencies working together

Agency July through September Totals in Acre-feet

Baseline Groundwater Use Total Pumped Transfer Credited*

City of Sacramento 2,426 4,491 2,313 SSWD 3,074 8,077 4,602 CWD 1,001 1,390 358 CHWD 130 1,584 1,338 FOWD 393 1,989 1,469 Totals 7,024 17,981 10,080 *Includes 8% streamflow depletion

The path to the Water Bank and its expansion

• 2022
• ~ $2 million

Finish planning to become fully

• perational
• ~2030
• ~$288 million
• Expansion scalable as funds available

Build additional facilities to expand

• n operations

A Water Bank can start small and grow substantially through time

North American Subbasin South American Subbasin Municipal in-lieu Municipal direct Recycled in-lieu Flood-MAR Agricultural in-lieu

Sources of recharge

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