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Dr. Richard Koehler, PH, Ph.D., CEO (Visual Data Analytics, LLC)

The American Institute of Hydrology is pleased to share news of the publication of Dr. Richard Koehler’s article titled “Quantifying Streamflow Properties using a Calculus-Based Differential Approach” in the journal Ecohydrology (October 2023). Dr. Koehler’s paper introduces an innovative approach to quantify streamflow temporal configuration using the lag(1) temporal autocorrelation signature of stream flow. His novel approach allows us to visualize, identify and quantify hydrologic alteration, which is a significant improvement over prevailing methods that relies on statistical-based index parameters.

We also thank Dr. Koehler’s past contributions to AIH. On June 16, 2022, he presented a webinar for AIH, titled “A Novel Approach to Quantify Streamflow Properties” where he included an overview on the autocorrelation method. He also published two articles for the AIH Bulletin: “A Climate Condition Analysis Using Palmer Hydrologic Drought Index (PHDI) Values”, June 2023 and “The Lag-1 Hydrograph – An Alternate Way to Plot Streamflow Time-Series Data”, September 2022.

Professor John Nieber, PH, PE, Ph.D., Professor (University of Minnesota)

The American Institute of Hydrology would like to congratulate Professor Nieber on receiving the prestigious Dave Ford Award in 2023 by the Water Resources Conference planning committee. The award is for professional and other related disciplines working in water resources. It honors a person for significant long-term achievement or public service in water resources management who exhibits the collaborative leadership style of Dave Ford.

Dr. Nieber has a record of outstanding achievements in the management of water resources. This record includes significant contributions in teaching, research, and public service. As a professor in the Department of Bioproducts and Biosystems Engineering at the University of Minnesota, Dr. Nieber has served as teacher and mentor for hundreds of students. His pedagogical approach blends theoretical rigor with the realities of complex watersheds. Dr. Nieber has provided invaluable leadership in the Water Resources Science graduate program serving as the Director of Graduate Studies. The breadth of his research is amazing, with projects ranging from the determination of water storage volume across Minnesota landscapes to the rigorous analysis of “fingering” caused by instabilities in unsaturated flows. Dr. Nieber has been a leader in establishing professional registration for hydrologists. He has served on the Executive Committee and as President of the American Institute of Hydrology. His collaborative leadership has resulted in strong working relationships with professionals working in academe, governmental agencies, nonprofit organizations, and consulting firms. He has inspired us to reach higher and work smarter.