Agenda subject to change.

Monday, November 6

Alum for Phosphorus Control in Lakes and Ponds

8:00 am – 5:00 pm | $190

Alum (aluminum sulfate) is widely used for controlling phosphorus (P) in lakes and ponds. There is a large body of knowledge and wide experience using alum due to its efficacy, safety and cost-effectiveness. This workshop provides a systematic overview of the planning, diagnostic, monitoring, dosing and application technologies for using alum for P control. Alum use strategies for deep and shallow lakes include a) water column P stripping, b) P interception, c) maintenance dosing, d) sediment P inactivation and e) P control in ponds. We provide overviews of the history of alum use, long-term efficacy, aluminum chemistry, diagnostic and modeling tools, a decision matrix for the appropriate alum use strategy, dosing calculations, application technologies and monitoring requirements. As well, we provide updated information on other P precipitants and compare/contrast costs, efficacy, reliability, etc. We will discuss numerous case studies and welcome participants to present their lakes’ concerns. The workshop is interactive and there is ample time for discussion.


Harry Gibbons has authored scientific articles, makes frequent presentations on lake management and participated in his first whole lake alum treatment in 1974 and has been actively involved in over 265 alum applications. He has served on the NALMS Board and as Past-President. Dick Osgood has conducted hundreds of diagnostic/modeling evaluations has authored numerous scientific articles, including design and implementation of alum treatments for lakes. He has served on the NALMS board as treasurer and as Past-President. Shannon Brattebo is an environmental engineer. Shannon’s work has focused on lake and reservoir water quality, restoration, and management both in the Pacific Northwest and across the nation. Shannon has been a member of NALMS since 2001, is currently NALMS Region 10 Director and is a past board member of the Washington Lakes Protection Association. John Holz and Tadd Barrow are limnologists who own and operate HAB Aquatic Solutions, which specializes in conducting both small and large-scale alum applications. Both John and Tadd are longtime members of NALMS and John is a past regional director on the NALMS board.

Collection, Identification, Ecology and Control of Freshwater Algae

8:00 am – 5:00 pm | $210
Sponsored by PhycoTech, Inc.

Photo by Ken Wagner

Algae are an important part of a properly functioning natural aquatic system, but when algae become abundant, water uses and habitat are often impaired. Toxicity of algae has become a “hot button” issue, and other water quality implications and aesthetic considerations remain prominent issues. All algae were not created equal, however, and proper collection and identification are essential to selecting a management strategy. This workshop is intended to provide information on how to collect and recognize common genera within major groups of algae, with emphasis on taxonomic detail and identification approaches. Participants are encouraged to bring any algae samples with which they would like identification help. The workshop also covers basic algal ecology and the methods used to control algae, but with only 8 hours, we can only introduce participants to issues and options. The workshop is taught by Drs. Ken Wagner and Ann St. Amand, experienced algal taxonomists and ecologists working in applied fields. Collectively they have many years of experience assessing algal problems, evaluating impacts and causes of algal nuisances, and developing algal management programs.


Ann St. Amand (co-chair) holds a Ph.D. in Aquatic Ecology from the University of Notre Dame. She has 31 years of experience identifying and enumerating over 39,000 algal samples from all over North America. Her company uses a unique proprietary mounting method, and custom software containing information on nearly 34,000 different aquatic organisms.

Ken Wagner (co-chair) holds a B.A. in Environmental Biology from Dartmouth College and M.S. and Ph.D. degrees in Natural Resource Management from Cornell University. He has taught an algal workshop in association with the North American Lake Management Society for 25 years, working cooperatively with expert phycologists and ecologists.

Barry Rosen has a B.S. in Botany from University of Connecticut, Storrs, M.A. in Biology from St. Cloud State University, Minnesota, and Ph.D. in Biology from Bowling Green State University, Bowling Green, Ohio. He has worked in algae in freshwater ecosystems for the past 40 years. He has been affiliated with several universities, the private sector, state and currently the federal government and the University of Central Florida. He has lived in several states including Virginia, Nebraska, Florida, Oregon, Vermont, Michigan, North Carolina and now Florida, working on a HABs nationwide.

Andrew Chapman has been a phycologist with GreenWater Laboratories since its inception in 2001. He received his B.S. in Biology from Susquehanna University in 1990 and a M.S. in Botany from the University of Oklahoma in 1993. His master’s research was on freshwater dinoflagellates. Since moving to Florida in 1993 he has been particularly interested in the ecology and taxonomy of potentially toxic cyanobacteria.

Internal Phosphorus Loading

8:00 am – 5:00 pm | $190

Photo by Chris Mikolajczyk

Internal phosphorus loading as phosphorus (P) released from anoxic sediment surfaces often represents the main summer P load to lakes. Because of its high biological availability, the lack of dilution, and the timing, it can have an immense effect on summer water quality of a lake, reservoir, or pond. However, depending on the stratification of the lake, it is not always easy to determine the quantity of internal load (especially in polymictic lakes), and it may be difficult to estimate the ultimate effect it may have on surface water quality (especially in stratified lakes).

This workshop presents a way of quantifying internal load in polymictic as well as stratified lakes. Considering lake characteristics and data availability, such quantification can be done in a step-wise fashion, where missing data may be predicted by subsidiary models. After the mere quantification of internal load the participant will learn how to combine it with external load in a simple mass balance model to predict seasonal phosphorus concentration. Knowing this, other water quality characteristics (algal biomass, bloom frequencies, Secchi disk transparency, and hypolimnetic anoxia) can be arrived at. Applications regarding lake quality assessment, nutrient criteria, total maximum daily load (TMDL) computations, and restoration options will be discussed.

Each workshop topic will include a description of the theory and presentation of case studies covering US, Canadian, and European lake assessment and restoration projects. Open discussion with attendees is encouraged, and comprehensive handouts and references will be provided. For preparation, see publications listed at, especially Nürnberg GK. 2009: Assessing internal phosphorus load – problems to be solved. Lake Reservoir Management 25:419–432.


Gertrud K. Nürnberg, Ph.D. is an environmental scientist at Freshwater Research, a limnological company focusing on restoration and modeling of eutrophic lakes and reservoirs. She is specialized in internal processes in eutrophic lakes such as internal phosphorus loading and hypoxia and has more than 30 years of experience working with lake associations, governmental agencies, engineering companies and the private sector in the US, Canada, and Europe. She has published comparative research and empirical lake models on phosphorus, iron and anoxia and on lake management techniques in numerous scientific journals and was an associate editor of the NALMS Journal, Lake and Reservoir Management, in 1996–2014.

John Fielder Photography Workshop

10:00 am – 5:00 pm | $175

Photo by John Fielder

This is your opportunity to learn landscape photography directly from Colorado’s premier nature photographer, John Fielder. Find out how John creates his award-winning images and gain a deeper understanding of the visual aspects of nature. In a comprehensive 2-hour slide show lecture learn how to improve your compositions and get an insider’s look at professional techniques, including which bells and buttons you only really need to use on your camera. At the end of the lecture, John will discuss and demonstrate the most important tools used in the post-processing program Lightroom. Appropriate for all levels of photographers, beginner to advanced.

We will break for lunch then spend 4 hours at some of John’s favorite Denver area scenic open spaces and parks photographing side-by- side with John. He will show you his compositions in his LCD, and he will critique yours. Any type of digital camera, point & shoot or SLR, is appropriate. Limit 16 participants.


John Fielder has worked tirelessly to promote the protection of Colorado’s ranches, open space, and wildlands during his 35-year career as a nature photographer and publisher. His photography has influenced people and legislation, earning him recognition including the Sierra Club’s Ansel Adams Award in 1993 and, in 2011, the Aldo Leopold Foundation’s first Achievement Award given to an individual. Over 40 books have been published depicting his Colorado photography. He lives in Summit County, Colorado, and operates a fine art gallery, John Fielder’s Colorado, in Denver’s Art District on Santa Fe. He teaches photography workshops to adults and children. His latest books are Colorado’s Yampa River: Free Flowing & Wild from the Flat Tops to the Green and Wildflowers of Colorado. Information about John and his work can be found at

Real Time Test Systems for Cyanotoxins

Morning Session: 8:00 am – 12:00 pm | $105
Afternoon Session: 1:00 pm – 5:00 pm | $105

Most of the harmful algae blooms in lakes throughout the world are due to cyanobacteria which include species that can produce toxins that are broadly called cyanotoxins. There is growing concern about the potential health and environmental effects of toxic blooms as cyanotoxins can cause illness and death of humans plus both domestic and wild animals. Children are at greater risk because of their smaller body size and the way they play in the water. The workshop is intended to provide approaches and examples for response protocols, risk assessment, monitoring programs and management options associated with harmful algae blooms and related cyanotoxins. The morning phase will present both historical background and an overview of rapid test methods and discuss the importance of sample collection, preparation, treatment, storage and transportation. Each participant will have an opportunity to conduct a semi-quantitative microcystins and/or cylindrospermopsin lateral flow, dipstick test. The afternoon phase will focus on participants conducting quantitative, microtiter plate format analysis.

Attendees may register for either the morning or afternoon session, or for both sessions.


Dave Deardorff holds a B.S. in Civil Engineering from Bucknell University and a MBA from the Wharton School. He is a retired Colonel, AUS, and is a licensed professional engineer with over forty years’ experience in environmental engineering. He has conducted over 100 installations and trainings of cyanotoxin systems globally for municipal, state and federal agencies.

The Role of Aeration/Oxygenation in Lake and Reservoir Management

8:00 am – 5:00 pm | $210

Addition of air or oxygen is frequently used as a lake management option for lakes suffering from oxygen depletion. When used properly, aeration/oxygenation can increase oxygen concentrations in the water column, decrease sediment nutrient release, minimize iron and manganese concentrations, and prevent fish kills. These systems can be designed to provide complete mixing throughout the water column, to increase oxygen concentrations in the hypolimnion without mixing the lake, or to aerate surface waters and provide aesthetic appeal. Improperly designed or installed aeration systems can increase algal growth and lead to decreased water clarity. The morning session of this workshop will discuss the pros and cons of aeration systems, describe factors that must be considered to properly design aeration/oxygenation systems, and present case studies for both successful and unsuccessful applications. The afternoon will include a tour of local reservoirs with different aeration systems.


Chris Holdren is a Certified Lake Manager and has served as President, Treasurer, and Board member for NALMS, and also served on the Boards of the Pennsylvania Lake Management Society, the Virginia Lakes and Watersheds Association, and the Colorado Lake and Reservoir Management Association. He has over 40 years of experience with lake and watershed management projects.

Jim Ruane is the President of Reservoir Environmental Management, Inc. and has over 50 years of experience in water quality management for water resources, mathematical modeling, field assessments, and research. He specializes in the development and application of river and reservoir models for hydrodynamics, water quality, aeration, and operational strategies as well as development of water quality management strategies. Assessing oxygen demands and aeration alternatives often is a site-specific process. He has worked on 150 reservoir projects, primarily hydropower projects.

Bob Kortmann is the founder and principal investigator of Ecosystem Consulting Service, Inc. and directs all research, consulting, and implementation projects for that firm. He specializes in the design and installation of aeration systems, and his work has led to the development of new diagnostic techniques and innovative lake and reservoir restoration methods, including three US patents.

Alex Horne is an Emeritus Professor with the Department of Civil and Environmental Engineering at the University of California Berkeley and former NALMS Board member. He has studied lakes, reservoirs, streams, wetlands and oceans in Africa, Antarctica, Europe, the Middle East, Australia, Asia, and North and South America. He has been a Principal Investigator in over 100 funded research projects and served as a consultant for over 600 water-related projects throughout the world. His projects included additions of oxygen or air for fish health and eutrophication reversal, and TOC/DOC and taste and odor reduction in reservoirs.