Bellmore, J. Ryan

Bountry, Jennifer A.

Collins, Mathias J.

Connolly, Patrick J.

Shafroth, Patrick B.

Tullos, Desirée D.

Wilcox, Andrew C.

English

ScholarWorks@UMass Amherst

University of Massachusetts AmherstScholarWorks@UMass AmherstInternational Conference on Engineering andEcohydrology for Fish PassageInternational Conference on Engineering andEcohydrology for Fish Passage 2016Jun 20th, 3:00 PM - 3:15 PMDam Removal I: Synthesis of CommonManagement Concerns Associated with DamRemovalMathias J. CollinsNOAA FisheriesDesirée D. TullosNOAA FisheriesJ. Ryan BellmoreNOAA FisheriesJennifer A. BountryNOAA FisheriesPatrick J. ConnollyNOAA FisheriesSee next page for additional authorsFollow this and additional works at: https://scholarworks.umass.edu/fishpassage_conferenceThis Event is brought to you for free and open access by the Fish Passage Community at UMass Amherst at ScholarWorks@UMass Amherst. It hasbeen accepted for inclusion in International Conference on Engineering and Ecohydrology for Fish Passage by an authorized administrator ofScholarWorks@UMass Amherst. For more information, please contact scholarworks@library.umass.edu.Collins, Mathias J.; Tullos, Desirée D.; Bellmore, J. Ryan; Bountry, Jennifer A.; Connolly, Patrick J.; Shafroth, Patrick B.; and Wilcox,Andrew C., "Dam Removal I: Synthesis of Common Management Concerns Associated with Dam Removal" (2016). InternationalConference on Engineering and Ecohydrology for Fish Passage. 1.https://scholarworks.umass.edu/fishpassage_conference/2016/June20/1Presenter InformationMathias J. Collins, Desirée D. Tullos, J. Ryan Bellmore, Jennifer A. Bountry, Patrick J. Connolly, Patrick B.Shafroth, and Andrew C. WilcoxThis event is available at ScholarWorks@UMass Amherst: https://scholarworks.umass.edu/fishpassage_conference/2016/June20/1Synthesis of common management concerns associated with dam removalMathias J. Collins, Desirée D. Tullos, J. Ryan Bellmore, Jennifer A. Bountry, Patrick J. Connolly, Patrick B. Shafroth, and Andrew C. WilcoxFish Passage 2016, Amherst, MA, June 20Gloucester, MAPresentation map• Acknowledgements• Study objectives• Methods• Example detailed findings• General findings• SummaryTullos, D.D., Collins, M.J., Bellmore, J.R., Bountry, J.A., Connolly, P.J., Shafroth, P.B., and Wilcox, A.C., in press, Synthesis of common management concerns associated with dam removal. Journal of the American Water Resources Association (JAWRA)AcknowledgementsWorking group on Dam removal: synthesis of ecological and physical responses of the U.S. Geological Survey  John Wesley Powell Center for Analysis and SynthesisStudy objectives• Articulate common management concerns (CMCs) and their potential negative consequencesCMC defn: dam removal outcomes that may require intervention but are broadly assumed, sometimes incorrectly, to occur at most sites• Identify where, and how commonly, CMCs occurred• Evaluate what conditions control their occurrenceSevenCommon Management Concerns (CMCs)Methods• Case study approach• Sites identified by:o querying Powell Center dam removal science database (Bellmore et al., 2015) and peer networkso high quality datao trying to represent dam removal geographyo minimum duration or timing of observations (e.g., 1-year post-removal)• Quantitative v. qualitative analyses vary by CMCExample findings: elevated turbidity• Magnitude and duration within range of basin storm events at 5 of 7 sites with 15 minute datao Many impoundments store little sediment as a proportion of average annual load (low V*)o Large proportion of annual load often transported during just a few days per year• Exceptional situations:o High V* (e.g., Elwha River)o Site specific circumstancesGeneral findings• Data not sufficient to support broadly applicable conclusions about where CMCs will occuro too few case studieso geographical bias to where dams have been removedo sampling biaso study durations typically too short• But, available data and existing knowledge of relevant processes revealed biophysical phenomena controlling CMC occurrenceGeneral findings• CMC occurrence is also controlled by ecological or human use impacts that people care about• Practitioners can evaluate CMC risk by evaluating:o Likelihood of the controlling biophysical phenomena occurring at their siteo Intersection of those phenomena with negative management implications• Some CMCs have common biophysical controls, facilitating identification of multiple site risks CMC Casestudies Biophysical process controlsSite conditions suggesting management implicationsDegree and rate of reservoir incision N/A• high % of stored fine sediments• average sediment deposit width/channel width > ~2.5• phased removalstakeholder values; fish passage needs or sensitivehabitatsExcessive channel incisionupstream of reservoir 38• reach-scale incision d/s• high % of stored fine sediments• phased removal• coarse delta• ephemeral flowinfrastructure within reservoir deposit or along margins at risk for bank erosion; fish passage needs or sensitive habitatsDownstream aggradation 6• high V*• proximal to dam• antecedent channel has low slope/unconfinedlow-lying properties; transportation infrastructure; pump intakes; fish passage needs or sensitive habitatsElevated turbidity 7• high % of stored fine sediments• high V*• rapid reservoir drawdownsensitive aquatic organisms; human recreational uses; drinking water intakesDrawdown impacts on local water infrastructure 5• large drop in water surface elevation• high degree of connectivity between the reservoir, river, and groundwater• regionally deep water tablewells or intakes in the reservoir vicinityNon-native plant colonization of reservoirs 23• proximity to non-native seed sources• high % of stored fine sediments• no planting or weed controllegal requirements for noxious weed and/or invasive species control; stakeholder valuesNon-native fish 7• abundance and proximity of non-native fish• availability of suitable habitat and temperatures for non-nativesstate fisheries regulations or management plans; stakeholder valuesElevated turbidit 7• high % of stored fine sediments• hi  V*• rapid reservoir drawdownsensitive aquatic organisms;human recreational uses; drinking water intakesSummary• Data for our seven CMCs not sufficient for broadly applicable conclusions about future occurrence• Available data and relevant process knowledge reveal biophysical controls on CMC occurrence• Practitioners can effectively evaluate CMC risks by: o Assessing likelihood of relevant biophysical phenomenao Investigating intersections of the phenomena with ecological or human use impacts important to stakeholderso Considering risks for multiple CMC occurrence via common biophysical controlsQuestions?

Dam Removal I: Synthesis of Common Management Concerns Associated with Dam Removal

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Dam Removal I: Synthesis of Common Management Concerns Associated with Dam Removal

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