Gary Johnson, Ph.D.
College of Science
Campus Locations: Idaho Falls
University of Idaho
Associate Professor - Hydrogeology
Surface and ground water interaction
Regional modeling of ground water and surface water
Water and energy interactions
- PhD, Civil Engineering, University of Idaho, Moscow, ID
- MS, Agricultural Engineering, University of Idaho, Moscow, ID
- BS, Agricultural Engineering, University of Minnesota, Minneapolis, MN
- Johnson, G.S., B.A. Contor, and D.M. Cosgrove, 2007, Efficient and practical approaches to ground water right transfers under the prior appropriation doctrine and the Snake River example. Journal of the American Water Resources Association, vol 44, no 1, pp 27-36.
- Cosgrove, D.M., G.S. Johnson, and D.R. Tuthill, 2008, The role of uncertainty in the use of ground water models for administration of Water Rights. Journal of Contemporary Water Research and Education, no 140, pp 30-36.
- Cosgrove, D.M. and G.S. Johnson, 2005, Aquifer management zones based on simulated surface-water response to aquifer stress (response functions). ASCE Journal of Water Resources Planning and Management, Vol. 131, No. 2, pp. 89-100.
- Cosgrove, D.M. and G.S. Johnson, 2004, Transient response functions for conjunctive water management in the Snake River Plain, Idaho. Journal of American Water Resources Association, Vol. 40, No. 6, pp. 1469-1482.
- Miller, S.A., G.S. Johnson, D.M. Cosgrove, and R. Larson. 2003. Regional scale modeling of surface and ground water interaction in the Snake River Basin. Journal of the American Water Resources Association, Vol. 39, No. 3, pp. 517-528.
- Surface and ground water interaction
Numerical models are often used to estimate the exchange of water between surface and ground water resources. Unconfined aquifers are sometimes modeled as constant aquifer thickness in the process because the resulting linear representations are more easily used in model development and in developing general understanding of the surface and ground water interaction. My present work is exploring the errors that result from using the constant aquifer thickness in that process, and the significance of those errors to aquifer management.
- Water and energy interactions
Water use affects energy consumption and generation. In southern Idaho the dominant consumptive water use is for irrigation and this use has dramatic impacts on electric power generation on the Snake River. Sound water management decisions need to include consideration of the effects on this carbon-free power resource. We have been engaged in systems dynamics modeling of the impacts of water management decisions on power generation in the Snake River basin.
- Snake Plain aquifer modeling
The State of Idaho is attempting to apply the best science in managing surface and ground water supplies. That science frequently employs application of ground water flow models. The Eastern Snake River Plain Aquifer model has been used to guide policies and State administrative orders. This model is developed in a collaborative atmosphere among water users, government agencies, and the University of Idaho. We are presently revising the model to provide a better tool for the future.