2020 Swan Falls Technical Working Group Presented by Ethan Geisler - - PowerPoint PPT Presentation

2020 Swan Falls Technical Working Group

Presented by Ethan Geisler May 20, 2020

16,000

Swan Falls Agreement Flows

Minimum Streamflow

• Snake at Murphy Minimum of Record (1981- 2018)

14,000

• Snake River at Murphy Median of Record (1981 - 2018)
• Snake River at Murphy Gage
• AADF - 3 Day Average

12,000

Snake River at Milner Gage

10,000

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6,000 4,000 2,000

https://idwr.idaho.gov/legal-actions/settlements/swan- falls/AADF-calculations.html

• D'epa

rtment of

Water Resources

Wat:er Rights Wellls Strnarns I Dams/ Hoods Forms Water Data Maps/ Spatia l Dat a Legal Actions Water Resoume B

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Home Legal Actions Settlements Swan Falls

MDF Calculations

~ External link

Swan Falls Settlement

SetUement Aire hive Technica W

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Po icy Group MIDF Calculations Technical Archive Meclia

ADJUSTED A VERAGE DAILY FLOW , (AADF) CAL.:CULATIONS

fl Swan Falls Adjlusted Average Daily Flow Cakulation

fl!: 3-Day A

v, erage MDF

fl!: AADf Graphs - Weekly I.Jpdate

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Legend

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USGS

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lotd USGS Gage: 131725001

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SGS Gage: 131 725001 ~PC Gage: 131724541

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wan Falls Dam Reservoir I

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31 hour lag 33 hour lag 2 hour lag

Conceptual Model

QMilner

Flow Past Milner Swan Falls Reservoir CJ Strike Reservoir Bliss Reservoir Lower Salmon Falls Reservoir

QAADF = QMurphy + ∆SSF+ ∆SCJ+ ∆SBliss + ∆SLSF If Idaho Power releases storage past Milner QAADF = QMurphy + ∆SSF+ ∆SCJ+ ∆SBliss + ∆SLSF - QMilner 10 hour lag 48-72 hour lag

Swan Falls Dam Lag Time

Date Flow Travel time (min) 4/11/2015 5600 45 5/26/2015 12000 45 7/4/2015 4550 45 9/18/2015 9000 45 9/29/2015 5500 45 1/2/2016 6500 45 2/16/2016 10000 45

• Idaho Power analyzed

different seasons and flow rates for comparison between Swan Falls Dam Outlet and the old Snake River nr Murphy gage

• Current lag time is 2 hours

(based on old analysis)

Date Flow Travel time (min) 4/20/2006 27500 45 5/11/2011 30000 45 10/1/2013 8900 45 10/2/2013 6200 45 1/9/2014 7000 45 4/4/2014 6000 45 4/1/2014 5000 45 7/9/2014 9000 45 7/24/2014 4700 45 10/4/2014 9250 45 10/4/2014 6600 45 1/24/2015 8600 45 1/25/2015 6900 45 4/11/2015 5600 45 5/26/2015 12000 45 7/4/2015 4550 45 9/18/2015 9000 45 9/29/2015 5500 45 1/2/2016 6500 45 2/16/2016 10000 45

JD

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Department of

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Water Resources

Swan Falls Dam Outlet to USGS Gage Preliminary Results No lag time

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Date

• Snake_ l3172454_IPCo

Snake_ l 3172500_ USGS

Next Steps

• Lag Time

– Verify 0 hour lag for Swan Falls Dam – Change lag in Excel AADF calculation for this year

• Or next year?

JD

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Department of

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1

Water Resources

~

Aquarius Time-series Calculation

• IDWR and Idaho Power both utilize Aquarius (AQ)
• Last meeting: proposed exploring calculation in

AQ

• Status:

– Idaho Power: Developed the calculation in AQ (with 15 minute time series)

• 15 minute data is necessary

– IDWR: Import USGS and Idaho Power Data

• Have the capability to reproduce the calculation in AQ

JD

,A LIQ

Department of

'/ \I 1

1

Water Resources

~

AADF Snake River nr Murphy Reservoir Adjustment Snake River at Milner

* If flow is IPCo Storage

Swan Falls CJ Strike Bliss Dam Lower Salmon Falls 15 min stage 60 min stage 15 min stage 15 min stage Hourly to Daily Mean Daily Mean Daily Mean Daily Value ∆Storage Discharge

Current Time-steps

JD

,A LIQ

Department of

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1

Water Resources

~

D D

D

=

+

AADF Snake River nr Murphy Reservoir Adjustment Snake River at Milner

* If flow is IPCo Storage

Daily Mean Daily Mean Daily Value Swan Falls CJ Strike Bliss Dam Lower Salmon Falls 15 min stage 15 min stage 15 min stage 15 min stage ∆Storage 15 min to Daily Mean Discharge

Proposed Time-steps

JD

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Department of

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Water Resources

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2019 AADF vs 15 minute calculation

1 Day AADF Comparison Plot - 2019 Calendar Year Data (Preliminary Results)

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~ 25000

20000

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15000 >

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10000

5000

1/1/2019 2/1/2019 3/1/2019 4/1/2019

• IOYIR_MOF
• AQ.MOF

_Without Mrlner

• AQ.MOI"

_W11h_Mrloer

5/1/2019 6/1/2019 7/1/2019 8/1/2019 9/1/2019 10/1/2019 l 1/1/2019

12/1 /2019

Discussion

• Official AADF: Excel, Aquarius, R, or other

– Currently Excel – Datasets posted online

• Any concern with 15 minute datasets?

JD

,A LIQ

Department of

'/ \I 1

1

Water Resources

~

Next Steps

• Lag Time

– Verify 0 hour lag for Swan Falls Dam

JD

,A LIQ

Department of

'/ \I 1

1

Water Resources

~

Next Steps

• Lag Time

– Verify 0 hour lag for Swan Falls Dam

• Aquarius Calculation

– Refine 15 minute time step calculation in Aquarius and work on 15 minute Excel calculation? – Verify 15 minute calculation: QA/QC – Analyze reservoir lag times?

JD

,A LIQ

Department of

'/ \I 1

1

Water Resources

~

Swan Falls Forecast Tool

May 20, 2020

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• 7,000

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Swan Falls Forecast Tool - January 2020 Forecast

• SFFT Uncertainty Range

Swan Falls Minimum Streamflow

• SFFT Forecast

10,000 9,000 8,000

• 7,000

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6,000

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5,000 4,000 3,000 2,000 1,000

Swan Falls Forecast Tool - May 2020 Forecast

SFFT Uncertainty Range Swan Falls Minimum Streamflow

• SFFT Forecast

Comments?

• r

Discussion?

Manual for the Milner to Murphy Reach Gain Forecast Tool Version 1.0 Final Report

May 2020 Idaho Department of Water Resources

Adapted from CH2M Hill's Final Signed Document {May 31, 2017)