Reservoir Sustainability Planning and Management

Transcription

1 Reservoir Sustainability Planning and Management Sean Kimbrel, M.S., P.E. Kent Collins, B.S., P.E. Tim Randle, Ph.D., P.E., D.WRE. Hydraulic Engineers

2 Outline Background General Process Summary

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4 Initial stable river profile Sediment Balance

5 Sediment Balance Reservoirs can disrupt sediment transport

6 Reservoir sedimentation Sediment Imbalance

7 Sediment Imbalance Upstream aggradation Downstream degradation

8 Under traditional design and operation of dams, reservoir storage is an exhaustible resource Paonia Dam, CO November 2014

9 Reservoir functions will start to be impaired once sediments reach the dam outlet

10 Turbines damaged by flood during extreme drawdown. Sand scoured from delta entered intake. 10,000 hrs normal operation Courtesy of G. Morris 24 hours operating with sand

11 What Can Be Done? Action must be taken to proactively manage sediment Life-cycle approach ACWI SOS resolution Manage sediment to extend dam/reservoir function Plan for dam decommissioning Long-term sediment management plans by 2030 Pilot basis: 1 or 2 per year 3,808 Federal Dams (NID, 2015)

12 How Do We Get There? Questions: What is the development process for a sediment management plan? Best method for identifying which reservoirs have the greatest need? Must Address Challenges: Social Environmental Economic Technical Legal

13 General Process a) Determine the Magnitude of Sedimentation b) Define Preliminary Options c) Define Stakeholders and Constraints d) Assess Feasibility and Economics of Options e) Develop and Implement a Plan f) Monitor and Revise Plan, If Necessary

14 a) Determine the Magnitude of Sedimentation Methods Repeat Hydrographic Surveys Sediment Flux Measurements Sediment Sampling Contaminant Sampling Indirect Methods landsurveyorsunited.com water.usgs.gov/sediment

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16 Based on methods in Utah Div. of W. Resour., 2010.

17 b) Define Preliminary Options From Kondolf, et al., 2014

18 Note: Currently no action at almost all facilities

19 c) Define Stakeholders and Constraints Stakeholders Owner Operator Users Community Region Other Constraints Physical Operational Economic Environmental Other

20 d) Assess Feasibility and Economic Viability Economics generally drives the management option RESCON approach (Palmieri et al., 2003) Three stages Which methods are technically feasible Economic analysis of which alternatives are more desirable Incorporate social and environmental factors for selecting the best course of action Environmental Considerations (NEPA, CWA, ESA) Analyze consequences Minimize any detrimental impacts

21 e) Develop and Implement Plan Detail a sediment management plan: Unique site constraints RESCON approach Timing of methods/options Water quality requirements Ideally, based on consensus with stakeholders

22 f) Monitor and Revise Plan, If Necessary Complex interaction between dynamic processes and static features. Continued monitoring required If method(s) not limiting impacts, plan may need to be revised, and steps repeated.

23 Summary Action must be taken, and a plan would help Sediment Management Dam Decommissioning General Guidelines a) Determine the Magnitude of Sedimentation b) Define Preliminary Options c) Define Stakeholders and Constraints d) Assess Feasibility and Economics of Options e) Develop and Implement a Plan f) Monitor and Revise Plan, If Necessary

24 Summary Future USBR Efforts Research Challenge Prize Competition Decision-making Tools Prioritization of Reservoir Surveys (Monitoring) Prioritization of Sediment Management Planning Database Modernization w/ Corps of Engineers Time-Based Estimation of Impacts Application of Long-term Discount Rates Pilot Studies of Reservoir Sustainability Options Detailed Guidelines Addressing Constraints

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26 Acknowledgements/References Thanks to: Reclamation Science and Technology Research Program, G. Annandale, G. Morris., R. Hotchkiss, T. Sumi, and other Reservoir Sedimentation Professionals Annandale, G.W. (2013). Quenching the Thirst: Sustainable Water Supply and Climate Change, CreateSpace, North Charleston, S.C. Basson, G.R., and Rooseboom, A. (1997). Dealing with Reservoir Sedimentation. Water Research Commission Report No. TT 91/97, Pretoria, xxxiii+395 pp. Gray, J.R., Bernard, J.M., Stewart, D.W., McFaul, E.J., Laurent, K.W., Schwarz, G.E., Stinson, J.T, Jonas, M.R., Randle, Timothy, and Webb, J.W., 2010, Development of a National, Dynamic Reservoir Sedimentation Database. Proc. 9th Federal Interagency Sedimentation Conference, June 27 July 1, Las Vegas, Nevada, 12 p. Kondolf, G.M. et al. (2014). Sustainable Sediment Management in Reservoirs and Regulated Rivers: Experiences from Five Continents. Earth s Future, 2, , doi: /2013ef Morris, G.L., and Fan Jiahua. (1997). Reservoir Sedimentation Handbook. McGraw-Hill. New York. Palmieri, A., Farhed, S., Annandale, G. W., and Dinar, A. (2003). The RESCON Approach: Economic and Engineering Evaluation of Alternatives Strategies for Managing Sedimentation in Storage Reservoirs. The World Bank, Washington, D.C. Utah Division of Water Resources (2010). Managing Sediment in Utah s Reservoirs: Utah State Water Plan.