benefits of evidence, badgering and collaboraon€¦ · rivers trust caba workshop 22.6.2017...
TRANSCRIPT
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RiversTrustCaBAWorkshop22.6.2017
ManagingAbstrac-onintheRiversWyeandUsk
BenefitsofEvidence,BadgeringandCollabora-on
JohnLawson,FREng,FICE,FCIWEMWaterResourcesAdvisertoWUF
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WhatIwillcover• Howacatchmentpartnershipreconciledtheneedsoffishandwatersupplies
• HowWUFcampaignedpriortothepartnership
• Theimportanceofevidence
• TheresulFngimprovements
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Cardiff
Brecon Hereford
Usk
Usk
Crai Talybont
Llandegfedd
R Wye
TheWye/UskWaterSupplySystemElan valley reservoirs Elan valley aqueduct
supplying 360Ml/d to Birmingham
Releases from Elan valley to regulate flows in Wye
Upper Usk dams supplying about 55 Ml/d to Swansea area
Releases from Usk dam to support drought flows
Lower Usk 175 Ml/d to Cardiff and Newport
Wye/Usk transfer 125 Ml/d Monmouth
Total all abstraction c 900 Ml/d
Builth Wells
Supplying 3 million people
Canal
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ImpactsonsalmonWUF’s concerns: • Impact of the original dams • Major flow regime changes since 1970s
• Much less reservoir spillage
• Big fall in salmon numbers since 1970s
• Salmon stuck in lower river
• Uncontrolled canal abstraction
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Original2007-10proposalsforHabitatsDirec-veCompliance
• FocusedonachievingHD“EcologicalRiverFlows”
• Used“benchmarkflows”,iedamsarenatural!
• Didn’treduceimpactsofdamsonspates
• Didn’tachievenaturalflowvariaFons
• Hadbigimpactoncanalwatersupplies,probablyrequiringcanalclosure
BUT,compliedwith“rules”,sodeemedOK!
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WUFWhingeing&Badgering
• From2007to2010,wewroteleRers,hadmeeFngs,madeFoIrequests
• Andgotnowhere!
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NRWresponsetoWUFWhingeing
• We’vecompliedwith“therules”• Ourmodellingshowsit’sOK• It’sbeenagreedbyeveryone• It’stoolatetochange
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WUFEvidenceGathering
Our own investigation to break the impasse
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WUFtoolsforgenera-ngevidence
• Wholeriversalmoncatchanalysis
• Individualbeatcatchanalysis• Modellingofwatersupplies,riverflows,watertemperatureandsalmonmigraFon
GeneraFngevidence-basedcounter-proposals
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Wye water resource model • Daily flows 1973-2011 • Elan reservoir storage • Transfers to B’ham & S. Wales • Farm supplies
Water temperature model • Daily flows 1973-2011 • Daily temps • Impact of reservoirs
WUF Wye modelling tools
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WyeSalmonCatchAnalysisFor 4 beats: Analysis of daily catch v flow records for c.9000 salmon
For whole river: Analysis of 100 years of records by season and reach
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Sampleevidencefrombeatcatchanalysis
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SummerFlownearErwood–600Ml/d
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Combinedcatchandflowanalysis
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ConclusionsontheWyeabstrac-onimpacts
• MigraFonfromtheestuarycurtailedindryyears
• MigraFonwithinriverdelayedbyspateclipping
• SituaFongeZngworseasabstracFonincreases
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WUF’sproposedsolu-on
• Makemoreuseofthereservoirstosupportriverflowsandecology
• Especiallyinnon-droughtyears• Majorimprovementwithnoimpactonwatersupplies
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MoreWUFBadgering
Using evidence to press for a better way
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Mid-2012:Forma-onofUsk&WyeAbstrac-onGroup(UWAG)
WelshWater,SevernTrent,NRW,EA,CRTandWUF
Workingtogetherto:• maximiseecologicalbenefits• minimiseimpactsonwatersupplies• improveoperaFonratherthancutsupplies• makebeReruseofreservoirstohelpfish
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KeyplayersinUWAG
Gail Davies, Welsh Water Owain Sheppard, NRW
Supported by Cascade Consulting (now Ricardo)
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UWAGEvidenceGathering• Ecologicalwalkoversurveys• Fishandmacrophytesurveys• Salmontracking• Waterqualitymonitoring• Temperaturemonitoring
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Wye water resource model • Daily flows 1973-2011 • Elan reservoir storage • Transfers to B’ham & S. Wales • Farm supplies
Estuary salmon migration models • Daily flows 1973-2011 • Daily salmon entry • Impact of flow changes
Water temperature model • Daily flows 1973-2011 • Daily temps • Impact of reservoirs
Usk water resource model • Daily flows 1973-2011 • 5 reservoirs storage • Canal supplies • Supplies to S.Wales
UWAG modelling tools
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UWAGcollabora-on• 4workinggroups–strategic,technical,modelling,fisheries
• 36workinggroupmeeFngsin2years
• Freesharingofdataanddraapapers• SharingandharmonisaFonofmodels
• Numerousdiscussionpapers,proposalsandcounter-proposals,leadingto:
UWAGAgreementofDecember2014
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TheUWAGAgreement
Signed by affected parties, supported by NRW & EA
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SummaryofWyeimprovementsNewUWAGproposals
Exceptinseveredroughts,useElanreservoirsto:
• Releaseupto700Ml/dfromElandamstoboostexisFngspates
• Delayswitch-offofregulaFonfor7daysaaerstartofspates
• IncreasecompensaFonreleasesbyupto330Ml/dtorestorenaturalflowsinElanandWye
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020040060080010001200140016001800200022002400
-2000-1500-1000-500
05001000150020002500300035004000
Environm
entalreleasesM
l/d
RiverflowM
l/d
Redbrookflows
Naturalflowreduced Naturalflowincreased NormalcompensationHEPrelease Normalregulation ExtracompreleaseDroughtcompboost Spateboost NaturalflowScenarioflow
Withfulluseofexistinglicences 1994Spates clipped
Regulation switch-offs
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020040060080010001200140016001800200022002400
-2000-1500-1000-500
05001000150020002500300035004000
Environm
entalreleasesM
l/d
RiverflowM
l/d
Redbrookflows
Naturalflowreduced Naturalflowincreased NormalcompensationHEPrelease Normalregulation ExtracompreleaseDroughtcompboost Spateboost NaturalflowScenarioflow
Withproposedlicences 1994Higher spate peaks and recession flows
More reservoir releases
Improved migration from estuary
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SummerFlownearErwood–600Ml/d
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0
1000
2000
3000
4000RiverflowM
l/d
Erwood
Naturalflowincreased Naturalflowreduced ReservoiroutflowWithhistoricabstraction Naturalflow
2004 Withhistoricabstraction
Spates much reduced by Elan dams
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0
1000
2000
3000
4000RiverflowM
l/d
Erwood
Naturalflowincreased Naturalflowreduced ReservoiroutflowWithproposedlicences Naturalflow
2004 Withproposedlicences
Spates and natural recession restored by reservoir releases Releases from
dams up to 700 Ml/d
Improved migration for adults and smolts Improvements achieved without impact on supplies
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SummaryofUskimprovementsNewUWAGproposals
• MinimalLowerUskpumpingfromApriltoOctober
• TherebyalsoavoidingdiurnalfluctuaFons• Reservoirrefillmainlyinwinter
• Extrareleasesfromupperreservoirstoboostspates
• ReleasesfromUskreservoirtokeepcanalopenwhilekeepingBreconflowswithin5-10%ofnatural
Withnoaddi-onaleffectonpublicwatersupplies
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To Canal
• Canal & Rivers Trust have unlimited Licence of Right • Limited to 25 Ml/d under informal agreement in 1999 • Until 2007, no reliable means of regular measuring • Gaugings at 50 Ml/d + in 2007
Canal abstraction at Brecon weir
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ImpactonlowsummerflowonUskatBrecon
40 Ml/d diverted into canal?
Residual flow in river 40 Ml/d?
Flow above weir 80 Ml/d
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Drought flows reduced by 50%
Historic flows at Brecon
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Canal kept open by Usk reservoir releases and new canal feeders
UWAG improved flows at Brecon
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LowsummerflowinthelowerUsk
Stranded ranunculus from diurnal pumping variation
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Withnatural
riverflows
WithUWAG
proposals DiffToendJune
ToendSep
ToendDec
5445 4093 1352 24.7% 24.8% 10.5%
SalmonmigrationtoendSep %losses
Flow reduced by c.40%
Salmon migration to end September reduced by 1350
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Much reduced pumping in migration season
1100 more salmon in river by end Sep With
naturalriverflows
WithUWAG
proposals DiffToendJune
ToendSep
ToendDec
5445 5175 270 4.1% 5.0% 2.4%
SalmonmigrationtoendSep %losses
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Benefitsofimprovements• Reducedspateclippinginbothrivers• MinimalsummerabstracFonfromlowerUsk• DailypumpingfluctuaFonsavoided• MuchbeRerflowsforspawningandjuveniles• MuchreducedmigraFonimpacts• CanaloperaFonsecuredindroughtsNoaddiFonalimpactonpublicwatersupplies
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Recentprogress• DraaingandagreeingnewlicencesandoperaFngmanuals(inprogress)
• NewpumpingstaFon,reservoiroutletvalvesandtelemetry(designsreadyforAMP6installaFon)
• CRTandWelshWaternegoFaFngtermsforUskreservoirsupportforcanalsupply
• ConFnuingphasedintroducFon(started2016)Benefitsalreadybeingseen
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Whatwe’velearned• Whingeingwithoutnewevidencedoesn’twork
• Badgeringwithnewevidencecanchangeminds
• GeneraFonofnewevidenceandproposalsthroughcollaboraFonworksbest
• Nothinggetsachievedwithoutmutualunderstandingofconcernsandgoals