John Keyantash

John Keyantash

College of Natural and Behavioral Sciences

Department of Earth Science

Professor of Earth Sciences

(310) 243-2363


Ph.D., Civil Engineering, University of California, Los Angeles, 2001

M.S., Atmospheric Sciences, University of California, Los Angeles, 1997

B.S., Environmental Science, Oregon State University, 1992


GEO 200 Physical Geography
GEO 315 The Weather
GEO 370 Numerical Methods in Geography
GEO 412 Rivers and Streams
GEO 416 Earth's Climates
EAR 312 Natural Disasters
EAR 416 Earth Science for Teachers
EAR 476 Groundwater


John Keyantash is an Professor in the Department of Earth Science and Geography, with specialization in hydroclimatology. His research includes quantifying the severity of meteorological and hydrological drought, as well as the hydrography of large rivers and waterfalls. He is interested in streamflow statistics—including the timing and volume of spring runoff—and has performed GIS analyses for the spatial network of streamgages in the Sierra Nevada Mountains. He is furthermore interested in geoheritage initiatives.

Dr. Keyantash is vested in high-impact practices for college undergraduates. He serves as a Preceptor for freshmen students participating in the First Year Seminar program, in which he teaches a section of UNV 101 Personal, Social, and Intellectual Development subtitled Waterfalls of the World. He has taught a Study Abroad course in Bulgaria, and is a Faculty Advising Fellow with the University Advisement Center.


  • Keyantash J., 2021. Indices for Meteorological and Hydrological Drought. In Hydrological Aspects of Climate Change, A. Pandey, S. Kumar, and A. Kumar, Eds., Springer Nature, Singapore, pp. 215-235.

  • Keyantash, John & National Center for Atmospheric Research Staff (Eds.), 2014. The Climate Data Guide: Standardized Precipitation Index (SPI). Last modified Aug. 7, 2018. Available as
  • Keyantash, J., 2011. Using GIS to map streamflow measurement deficiencies in remote watersheds.  CSU Geospatial Review, San Francisco State Univ., v. 9, Spring 2011.

  • Hidalgo H., L. Brekke, N. Miller, N. Quinn, J. Keyantash and J. Dracup, 2006. Assessment of the impacts of climate change on the water allocation, water quality and salmon production in the San Joaquin River Basin. Climate Change and Variability: Impacts and Responses, M. Ruth, K. Donaghy, and P. Kiershen, Eds., Edward Elgar Publishing, Northampton, MA, pp. 30–57.

  • Keyantash, J. and J.A. Dracup, 2004. An Aggregate Drought Index: Assessing Drought Severity Based on Fluctuations in the Hydrologic Cycle and Surface Water Storage, Water Resources Research, 40, W09304, doi:10.1029/2003WR002610.

  • Keyantash, J. and J.A. Dracup, 2002. The Quantification of Drought: An Analysis of Drought Indices. Bulletin of the American Meteorological Society, 83 (8), 1167-1180.

  • Keyantash, J. and J.A. Dracup, 1998. The Timing of Peak Spring Runoff from Yosemite National Park. Proc. Fifteenth Annual Pacific Climate Workshop, R. Wilson and L.D. Buffaloe, Eds. Tech. Report 64 of the Interagency Ecological Program for the San Francisco Estuary.

American Geophysical Union
CSU Water Resources and Policy Initiatives (WRPI) affinity group
CSU GIS Specialty Center