Brian Patton

November 8, 2017

Update on Water Supply and ESPA Managed Recharge

Idaho Legislature Interim Committee on Natural Resources Boise, Idaho

2018 Water Supply = Reservoir Carryover + New Runoff

2018 Water Supply = Reservoir Carryover + New Runoff

Upper Snake Reservoirs = 76% of capacity

Current Contents

Average Contents

Boise Reservoirs = 55% of capacity

Current Contents

Average Contents

Payette Reservoirs = 69% of capacity

Current Contents

Contents Last Year

Oakley Reservoir= 37% of capacity

Mackay Reservoir= 83% of capacity

(highest historical carryover)

Magic Reservoir= 65% of capacity Bear Lake = 85% of

capacity

Salmon Falls Creek

Reservoir= 39% of capacity

2018 Water Supply = Reservoir Carryover + New Runoff

Basin

% of Average streamflow need to

meet adequate irrigation supply in 2018

Bear 17%

Salmon Falls 15%

Oakley 39%

Little Lost 40%

Big Wood 43%

Boise 51%

Upper Snake 71%

Big Lost 107%

Runoff Needed

Source: NRCS Snow Survey

ENSO Status: La Nina Watch

1912 – 1952 Change +17,000,000 AF

1952 – 2015 Change -13,000,000 AF

Average annual 1952-2015 loss of aquifer storage is about 215,000 AF

Aquifer storage and flows from the Thousand Springs are directly correlated

Aquifer Storage

Thousand Springs Discharge

Total Thousand Springs Flows

Volume Change of Water Stored Within the Eastern Snake Plain Aquifer and Thousand Springs Total Discharge

Combined System

Surface Water Coalition Delivery Call

Thousand Springs Area Delivery Calls

ESPA discharge to Snake River at Thousand Springs

ESPA discharge to Snake River at American Falls

Milner Dam – Milner Zero Flow

Thousand Springs-fed minimum flows pass through IPCO hydropower system

Swan Falls Dam –Minimum Flow of 3,900 cfs/5,600 cfs

American Falls-area springs partly supply river flows that feed Surface Water Coalition canals

Idaho Power Hells Canyon Complex

2016 Legislative Actions

•Senate Concurrent Resolution 136 – Supports Surface Water Coalition Delivery Call Settlement

•Senate Concurrent Resolution 137 – Directs Water Board and IDWR to address declining aquifers state-wide

•Senate Concurrent Resolution 138 – Directs Water Board to develop capability to accomplish average of 250,000 AF of managed recharge annually by 2024

•Senate Bill 1402 – firmed up funding for managed recharge

2016 Legislative Actions

•Senate Concurrent Resolution 136 – Supports Surface Water Coalition Delivery Call Settlement

•Senate Concurrent Resolution 137 – Directs Water Board and IDWR to address declining aquifers state-wide

•Senate Concurrent Resolution 138 – Directs Water Board to develop capability to accomplish average of 250,000 AF of managed recharge annually by 2024

•Senate Bill 1402 – firmed up funding for managed recharge

Recharge Program

Capacity Development Construction of conveyance and recharge sites Institutional agreements

Operations Operations agreements Monitoring

Administration of Program

Lower Valley Recharge Capacity –Complete / In Progress

Projected Winter Capacity980 cfs = 290,000 af

500 cfs

30 cfs

100 cfs

300 cfs

50 cfs

Minimum Water Availability500 cfs = 150,000 af

Dietrich Drop By-Pass

Water Available - 150 days

Median Water Availability1,000 cfs = 300,000 af

Upper Valley Off-Canal Recharge Capacity – Current

Water Available Every Other Year on Average

Off-Site Capacity430 cfs = 26,000 af

200 cfs

20 cfs

30 cfs

30 cfs

150 cfs

April – June ~ 30 days

Median Water Availability1980-2014 = 150,000 af

Upper Valley – Recharge Capacity in Development

2016-2017 Recharge Construction Milner-Gooding Canal: MP31 2nd Turn-Out

Construction on Nov 29, 2016 New facility in use – April 24, 2017

Completed pumps and piping to SWID injection well system

Pipeline under constriction to SWID injection well system --

June 20, 2017

November 1, 2016

2016-2017 Recharge Construction Southwest Irrigation District: Buckhorn Pipeline

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ECC

FMID

GFCC

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NSCC

AFRD2

SWID

TFCC

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Total IWRB Managed Recharge Rates During 2016 - 2017 Season

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Dates of Recharge

Recharge below Minidoka Dam Oct 25 - May 17

Jun 9 - July 2

Preliminary Data

Total IWRB Managed Recharge Rates During 2016 - 2017 SeasonTotal Volume of Recharge = af (October 25, 2016 to )317,714

Total Water Available for Recharge Snake River

July 7, 2017

Maximum Flow past Milner

4/14 = 21,300 cfs

Big Wood Recharge Feb 22 -

Jun 23

Recharge above Minidoka Dam Feb 28 - May 17

Jun 9 - July 2

Upper Valley

Lower Valley

Big/Little Wood

ESPA Managed Recharge Operations & GW level monitoring $2,950,000

ESPA Managed Recharge Infrastructure (MP31, NSCC, SWID, Egin Ph. 2) 4,200,000

Investigation/engineering for further ESPA recharge capacity improvements 460,000

Treasure Valley (Ground Water Model, Recharge Studies, Storage Studies) 1,700,000

Mountain Home Aquifer Recharge 50,000

Weiser River Valley 100,000

Bear/Malad Aquifers 50,000

Northern Idaho Aquifers 109,273

State-Wide Efforts 1,820,000

Amount reserved for projects in other priority aquifers or carry-forward 723,551

TOTAL FY2018 BUDGETED FUNDS $ 12,162,824

IWRB FY 2018 Budget for Aquifer Stabilization (Secondary Aquifer Fund)

ESPA Recharge share is $7.61M

IWRB ESPA Managed Recharge – 2016 / 2017

SWID - 802 af

Jensen Grove - 4,864 af

TFCC – 9,121 af

NSCC – 23,878 af

AFRD2 – 107,470 af

BWCC – 39,240 af

FMID - 61,103 af

ECC -7,623 af

GFCC - 53,060 af

FFIC - 10,553 af

Total IWRB Recharge 317,714 af

C Canal

By-passCanal

Planned 2017-2018 Construction - North Side Canal Company

Wilson Lake Recharge Area - 130 cfs

Wilson Canyon Recharge Site - 100 cfs

Hydro By-PassProjects

Estimated annual recharge volume – 60,000 AF/yearTotal cost: $4M

Water Resource Board

Planned 2017-2018 Construction: Richfield Site – Wood River

Potential Recharge Capacity 100 cfs - Big/Little Wood Rivers

(Fall 2017)

Oct 2017

50.8 acresDevelopment of Proposed Site

• Engineering Design• Turnout Structure w/ Headgates• Basin Work

• Trenching• Berms

• Monitoring Plan & Wells

TOTAL $150,000

Planned 2017-2018 Construction: Egin Lakes Phase II

Potential Recharge Capacity 60 cfs (additional) - (Fall 2017)

Oct 2017

• Phased Construction: 1. Egin Ditch $95,0002. Canal Drop Structure $61,0003. Berms

• Egin Lakes $170,000• Qualye Lake $155,000

• Contingency (25%) $85,000

• Oversight $14,000

TOTAL $580,000

Egin Ditch

Berms

Phase I

Phase II

Canal Drop Structure

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ASCC

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ECC

NSID

SVRID

FMID

NSCC

AFRD2

TFCC

SWID

Available Flow

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Dates of RechargePreliminary Data

Total IWRB Managed Recharge Rates During 2017 - 2018 SeasonTotal Volume of Recharge = af (August 30, 2017 to )85,897 November 5, 2017

Upper Valley

Lower Valley

Total Natural Flow Available below Minidoka Dam for

Recharge - Snake River

2017 SWC Storage WaterTotal Volume = 61,100 af

above Minidoka DamRecharge Started

Aug 30

above Minidoka DamNatural Flow Recharge

Oct 31

Recharge Right in Priority belowMinidoka Dam

Oct 16th

Water Resource Board

Questions ?