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Swan Falls Technical Working Group Presentation | February 23, 2021

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Swan Falls Technical Working Group Presentation | February 23, 2021 2021 Swan Falls Technical Working Group Presented by Ethan Geisler February 23, 2021 2020 Provisional AADF 16,000 Minimum Streamflow --Snake River nr Murphy Minimum of Record (1981- 2019) 14,000 --Snake River nr Murphy Median of Record (1981- 2019) - 2020 - Snake River nr Murphy Gage - Snake River at Milner Gage 12,000 - AADF- 3 Day Average 10,000 V) U 8,000 6,000 4,000 Flow 2,000 Flood Control Aug IPC Storage IPC Storage 0 Review of Changes to 2021 Swan Falls AADF • Utilizing CJ Strike at Boat Dock nr CJ Strike Dam (13171495) instead of CJ Strike Dam Headwater data (13171550) • Utilizing 15 minute data for all reservoir datasets now – CJ Strike Reservoir Data • CJ Strike Dam at Boat Dock nr CJ Strike Dam (13171495) • CJ Strike at Cottonwood Park nr Bruneau, ID (13170340) • Snake River at Loveridge Bridge nr Bruneau, ID (13157350) – Lower Salmon Falls Dam, Bliss Dam, and Swan Falls Dam are already 15 min datasets • Swan Falls Dam Lag – Lag time changed from two hours to zero hours (no lag) – Lag times from other reservoirs have been kept the same at this time ~A LIQ Deportment of 13 170340 JD'/ \I 11 Water Resources Cottonwood Pa rk Sampling Interval "" 5 min Averaging Interval = 30 seconds (12 samples per !.ccond) Timc:;~ric!. ,\~ii.able tor AJ\DF Idaho Power’s Proposed Sfati~tiea! computat ion performed in Aquarius: t hat crea:e:; a 15mi n mean value fro m t he Sm!n sample i collected Change to Data Collection r1 I l n1-1 er1e,_. 13157350 • AADF currently uses the CJ Strike 15 Loveridge Bridge minute datasets – Current datasets sample every 5 minutes, ,l,•1•~"'t !nt."n.>t :::: l h iO h 11hhl<>r1< IIU~ ;m ,rn •l it•"'' p llm l'lln~ stnl"i'f· Mo...• lc,n11 ~n d i't;,..,..ofta n i1 ii: JlU,.prlg c "f '"nc, c,r: t ~" m c;a£"•J ·ed prc.i:~•Jt a ::liff..-o-.:e be.two;,-, th:o ln t eve c a ad 11;,.., lof'l8it t ab , ur,1:il th;, pn;iaurawill t,, rtabk . Th,;;ra ii 1 cti.a Iv n a­ average to the 15 minutes ~.-cra;;:s:,-...ilLc output. n-.~l ;)!:f: ~ i :fy;i,luc ~ft~r :he :>-'•&c prc,cc,clu~ w il bc:t hcc o,.lputsn LC . l tall»lc.tl computarlon PtJ1orme CI tn AQuarlusttt at cre-.i,es a 1:>T ln ni,ean ·,auerromt he 5mln ;llm:>Es • Idaho Power is proposing to change r n ll••rtafl • · l'fl• 9'f "' data collection from 5 minute sampling to 15 minute sampling 13171495 Boat Dock • CJ Strike datasets will still be available for the 15 minute time-step Sampling lntP.rwll == S min Av~raging lnt~rval = .~n s~rnncis (17 sc:mples per second) Timeseries .Available for AAOF ~min sample,; are availabfe in Aquarius: Swan Falls2021 AADF AADF Flow Flows at at Snake Snake River River near nr Murphy Murphy 16,000 Minimum Streamflow - Snake River nr Murphy Minimum of Record {1981- 2020) 14,000 - Snake River nr Murphy Median of Record (1981- 2020) - snake River nr Murphy Gage - AADF- 3 Day Average 12,000 - Snake River at Milner Gage 10,000 V') b s,ooo 6,000 4,000 2,000 0 Home Legal Actions Settllements Swan Falls AADF Calculations ~ External link Swan Falls Settlement Settlement Archive Technical Working Group Po licy Group AADF Calculations Technical Archive Media ADJUSTED AVERAGE DAILY FLOW (AADF) CALCULATIONS le! Swan Falls Adjusted Average Daily Flow Calculation I 3-Day Average AADF I AADF Graphs - Weekly Update HIISTORICAL AAD F https://idwr.idaho.gov/legal- I AADF Graph for 2019 actions/settlements/swan-falls/AADF- I AADF Graph for 2018 calculations.html I AADF Graph for 2017 I AADF Graph for 2016 I AADF Graph for 2015 I AADF Graph for 2014 IQuestions on the AADF? I • DRAFT Final is posted Manual for the Milner to Murphy Reach Gain Forecast Tool online Version 1.1 DRAFT Final • Approved by Technical October 2020 Working Group at October 21, 2020 meeting Idaho Department of Water Resources Adapted r,om CH2M Hill's Final Signed Oow.rnent (May 31. 2017) Swan Falls Forecast Tool - January 2020 Forecast 12,000 10,000 -~ 8,000 - M -~ 6,000 SFFT Uncertainty Range Swan Falls Minimum Streamflow - SFFT Forecast 4,000 -Modified AADF - 3 Day Average (excluding Milner) 2,000 0 Swan Falls Forecast Tool - January 2021 Forecast 9,000 8,000 + + 7,000 - 6,000 + m"' "'~ -a, 5,000 bO • SFFT Uncertainty Range '-ns .c Swan Falls Minimum Streamflow u 4,000 - SFFT Forecast -C~ 3,000 2,000 1,000 0 <:> '.\,<:> '.\,",, '.\,",, ",, ",, ",, '.\,",, ",, 'I- ",, ~'V ~;I, ~'\, ;1-"" (5 ~ '$) ._:;;."' ~ r;"' ~o ()q; \"ti «e ~"ti~"' "?-<:J ~'b ',v ...,v~"' "?-.:s c.,e<:J 0 Swan Falls Forecast Tool - January 2021 Forecast 9,000 8,000 + + 7,000 -~ 6,000 m ~ -a, 5,000 ~ SFFT Uncertainty Range ns .c Swan Falls Minimum Streamflow u 4,000 - SFFT Forecast -~C -Modified AADF - 3 Day Average (exlcuding Milner) 3,000 2,000 1,000 0 Questions?.
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