Reservoir Sedimentation and Sustainable Management

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Ever wonder what happens when a reservoir reaches the end of its sediment design life? Ever thought about what it would take to replace the current water storage benefits of a reservoir? The problems and solutions to reservoir sedimentation will be described in the USSD webinar on reservoir sedimentation and sustainable management. This webinar is for dam operators, consultants, and decision makers who may not have expertise in sedimentation, but who are interested in sustaining reservoir storage capacity. In 2018, the USSD Board of Directors passed a resolution that “encourages all dam owners to develop long-term reservoir sediment-management plans for the reservoirs that they own or manage by 2030.” (

All rivers naturally transport sediment (clay, silt, sand, and gravel) and reservoirs tend to trap this sediment, reducing water storage capacity. In addition, continued reservoir sedimentation will eventually threaten the reliable operation of dam outlets, reservoir water intakes, boat ramps and marinas. There are no early warning signs of sedimentation problems. The first symptom may be a dam outlet or water intake plugged with woody debris and sediment.

Sustainable sediment management begins with monitoring, normally through repeat bathymetric surveys of the remaining storage capacity. Management solutions include reducing sediment yields from the upstream watershed, passing inflowing sediments through or around the reservoir, or removing previously deposited sediments from the reservoir. Economic analysis of reservoir sedimentation management needs to compare all costs and benefits associated with each alternative. Although some people assume that ignoring sedimentation is the cheapest option, the cost of sustainable sediment management can be less than the cost of upstream channel aggradation (increased groundwater and flood stage), downstream channel degradation (erosion of habitat, infrastructure, and property), diminishing reservoir storage capacity, eventual dam decommissioning, and the construction of replacement reservoir storage.

 2-hour webinar, including three 30-minute presentations, followed by a 30-minute question and answer session


Eligible for 2 PDHs

George W. Annandale, Ph.D., P.E.


George W. Annandale, Inc.

Dr. Annandale has more than 45 years of experience as a civil engineer specializing in water resources engineering.  He has published numerous peer-reviewed papers and is author and co-author of five books on sedimentation and scour. He was named by International Waterpower and Dam Construction as one of 20 engineers who globally made a significant contribution to dam engineering. He specializes in scour of rock and sustainable development of water resource infrastructure; focusing on reservoir sedimentation management, dam safety and climate change assessment. 

Gregory L. Morris, Ph.D., P.E.

GLM Engineering

Dr. Gregory Morris is a professional engineer having extensive international experience working with sediment management in reservoirs and rivers. His professional experience includes consulting on sediment management problems in reservoirs on 5 continents. He is co-author of Reservoir Sedimentation Handbook (McGraw-Hill,1998), the first comprehensive publication on this topic, Extending the Life of Reservoirs (World Bank, 2016), and numerous other publications. 

Paul Boyd, Ph.D., P.E.

Hydraulic Engineer

U.S. Army Corps of Engineers

Paul is the Regional Technical Specialist for Sedimentation and Alluvial Processes for the USACE Northwest Division in Omaha, NE. He has 18 years' service as Hydraulic Engineer, Regional Technical Specialist, and Project Manager in sediment related fields. He also has experience with hydraulic design using HEC-RAS, HEC-6T, RMA2, SED2D, ADH, and GSTARS-HTC, as well as managing engineering teams for various studies. Paul's experience includes a wide variety of field work including terrestrial and hydro surveying, sediment sampling, on-site management, and problem solving. He is the current chair of the SEDHYD Sedimentation Committee.

Currently, Paul's activities include being a team leader for 2-D Modeling with the Missouri River Recovery Program Habitat Assessment and Monitoring Plan (HAMP). He also takes part in the Lewis and Clark Lake Sediment Management/Flushing Study and serves as the Omaha team lead for the USACE Regional Sediment Management Program. In addition, he is the point of contact for sedimentation issues on the Missouri River Basin within USACE; and serves as the Technical Liaison for Missouri River Flow Frequency Update. Paul is also involved with Reservoir Sustainability Planning and Analysis and is the agency lead for the development of the Geomorphic Data Exchange Portal.

Tim Randle, Ph.D., P.E. (Moderator)


Bureau of Reclamation (ret.)

Tim Randle was formerly a Supervisory Civil Engineer (Hydraulics) and Manager of the Bureau of Reclamation's Sedimentation and River Hydraulics Group.  He received his B.S. in Civil Engineering from the University of Utah and his M.S. and Ph.D. in Civil Engineer from the University of Colorado.

Tim Randle is a registered professional engineer, member U.S. Society on Dams, member of the American Society of Civil Engineers, and a Diplomate, Water Resources Engineer for the American Academy of Water Resources Engineers. He presently serves as chair of the National Reservoir Sedimentation and Sustainability Team, board member for SEDHYD, Inc., and serves on the SEDHYD Sedimentation Committee. He is past Chair of the interagency Subcommittee on Sedimentation.

Tim Randle served the Bureau of Reclamation for 40 years—nearly all of that time with the Sedimentation and River Hydraulics Group.   He has developed several computer models and conducted geomorphic and hydraulic studies of many rivers throughout the western United States. He led an EIS for the reoperations of Glen Canyon Dam to deliver water, generate power, and improve environmental conditions in Grand Canyon. He provided the sediment management expertise for the Elwha River Restoration Project.  In 1997, he was honored as Reclamation’s “Engineer of the Year” and named one of the top ten Federal Engineers by the National Society of Professional Engineers.  In 2016, he received the Distinguished Service Award from the U.S. Department of the Interior.


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Agree to terms to continue. USSD Virtual Programs Code of Conduct
Live Webinar
11/18/2021 at 10:00 AM (MST)   |  120 minutes
11/18/2021 at 10:00 AM (MST)   |  120 minutes
2 Questions
PDH Certificate
2.00 PDH credits  |  Certificate available
2.00 PDH credits  |  Certificate available