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United States Department of Agriculture

Agricultural Research Service

Mary Hennessey Nichols

Research Hydraulic Engineer

Dr. Mary Hennessey Nichols, Research Hydraulic Engineer

USDASouthwestWatershedResearchCenter, 2000 E. Allen Rd., Tucson, Az. 85719

Phone: 520-647-9062, email:


Education:      Ph.D., Engineering, 1999, New MexicoStateUniversity, Las Cruces, NM

                        M.S., Forestry, 1989, University of Maine, Orono, ME

                        B.S., Forest Engineering, 1987, OregonStateUniversity, Corvallis, OR

                        A.A.S., Pre-Professional Forestry, 1984, Paul Smith's College, Paul Smiths, NY



2001-present:   Scientist, USDASouthwestWatershedResearchCenter, Tucson, AZ

2005-present:   Adjunct Professor, U.A. Dept. of Ag and Biosystems Engineering, Tucson, Az.

1992-2001:      Hydraulic Engineer, USDASouthwestWatershedResearchCenter, Tucson, AZ


Research Interest:  Research is focused on erosion and sedimentation processes in arid and semiarid regions with emphasis on technologies for soil and water conservation and rangeland management.


Professional Service:

Member: Society for Range Management (SRM)

Member: Soil and Water Conservation Society (SWCS)

Member: Malpai Borderlands Group Science Advisory Board, Upper Eagle Creek Watershed Association Science Advisory Board

Fellow: Fine Outreach for Science


Recent Publications (full list and pdf available at


Nichols, M.H., Ruyle, G.B., Nourbakhsh, I.R. 2009. Very High Resolution Panoramic Photography to Improve Conventional Rangeland Monitoring. Rangeland Ecology and Management. 62:579-582


Nichols, M.H., Anson, E.A. 2008. Southwest Watershed Research Center Data Access Project. Water Resources Research. Vol. 44, W05S03, doi:10.1029/2006WR005665

Stone, J.J., Nichols, M.H., Goodrich, D.C., Buono, J. 2008. Long-term runoff database, Walnut Gulch Experimental Watershed, Arizona, United States. Water Resources Research, Vol. 44, W05S05, doi:10.1029/2006WR005733


Nichols, M.H., Stone, J.J., Nearing, M.A. 2008. Sediment database, Walnut Gulch Experimental Watershed, Arizona, United States United States. Water Resources Research. Vol. 44, W05S06, doi:10.1029/2006WR005682


Nichols, M.H. 2006. Measured sediment yield rates from semiarid rangeland watersheds. Rangeland Ecol. and Manage. 59(1):55-62.


Nearing, M.A., Nichols, M.H., Kimoto, A., Ritchie, J.C. 2005. Spatial patterns of soil erosion and deposition in two small, semiarid watersheds. J. Geophys. Res., 110, F04020, doi:10.1029/2005JF000290


Nichols, M.H. 2004. A radio frequency identification system for monitoring coarse sediment particle displacement. ASAE Applied Engr. in Agric. 20(6):783-787


Nichols, M.H., Renard, K.G., Osborn, H.B. 2002. Precipitation changes from 1956-1996 on the Walnut Gulch Experimental Watershed. J. Am. Water Resources Assoc. 38(1):161-172
Last Modified: 8/12/2016
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