Environmental Management

, Volume 11, Issue 6, pp 757–769

Basic hydrologic studies for assessing impacts of flow diversions on riparian vegetation: Examples from streams of the eastern Sierra Nevada, California, USA

  • G. Mathias Kondolf
  • J. Warren Webb
  • Michael J. Sale
  • Thomas Felando


As the number of proposals to divert streamflow for power production has increased in recent years, interest has grown in predicting the impacts of flow reductions on riparian vegetation. Because the extent and density of riparian vegetation depend largely on local geomorphic and hydrologic setting, site-specific geomorphic and hydrologic information is needed. This article describes methods for collecting relevant hydrologic data, and reports the results of such studies on seven stream reaches proposed for hydroelectric development in the eastern Sierra Nevada, California, USA. The methods described are: (a) preparing geomorphic maps from aerial photographs, (b) using well level records to evaluate the influence of streamflow on the riparian water table, (c) taking synoptic flow measurements to identify gaining and losing reaches, and (d) analyzing flow records from an upstream-downstream pair of gages to document seasonal variations in downstream flow losses. In the eastern Sierra Nevada, the geomorphic influences on hydrology and riparian vegetation were pronounced. For example, in a large, U-shaped glacial valley, the width of the riparian strip was highly variable along the study reach and was related to geomorphic controls, whereas the study reaches on alluvial fan deposits had relatively uniform geomorphology and riparian strip width. Flow losses of 20% were typical over reaches on alluvial fans. In a mountain valley, however, one stream gained up to 275% from geomorphically controlled groundwater contributions.

Key words

Hydroelectric impacts Eastern Sierra Nevada Riparian vegetation 


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Literature cited

  1. Buchanan, T.J., and W. P. Somers. 1969. Discharge measurements at gaging stations. Techniques of water resource investigations of the U.S. Geological Survey. Book 3, ch. A8. Washington, D.C.Google Scholar
  2. California Department of Water Resources. 1980. California rainfall summary, Sacramento, California.Google Scholar
  3. Chen and Associates. 1982. Geotechnical investigations, Scheelite area, Union Carbide Pine Creek Mine, Bishop, California. Unpublished report to Dravo Corporation, Denver, Colorado.Google Scholar
  4. FERC (Federal Energy Regulatory Commission). 1985. Procedures for assessing hydropower projects clustered in river basins: request for comments.Federal Register 50:3385–3403.Google Scholar
  5. FERC (Federal Energy Regulatory Commission), Office of Hydropower Licensing. 1986. Final environmental impact statement, Owens River Basin: seven hydroelectric projects, California. Docket no. EL85-19-102. FERC, Washington, D.C.Google Scholar
  6. Groves Energy Company. 1984. Response to agency comments, Keating Pine Creek Project, FERC no. 3258-002-Calif. Filed at Federal Energy Regulatory Commission, 31 May 1984.Google Scholar
  7. Harrison, S. S., and L. Clayton. 1970. Effects of groundwater seepage on fluvial processes.Geological Society of America Bulletin 81:1217–1226.Google Scholar
  8. Jarrett, R. D. 1985. Analysis of vertical-velocity profiles in higher-gradient streams in Colorado [abstr.].EOS Trans. Am. Geophys. Union 66:912.Google Scholar
  9. Johnson, R. R., C. D. Ziebell, D. R. Patton, P. F. Ffolliott, and R. H. Hamre (technical coordinators). 1985. Riparian ecosystems and their management: reconciling conflicting uses. First North American Riparian Conference, 16–18 April 1985, Tucson, Arizona. General Technical Report RM-120. US Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, Colorado.Google Scholar
  10. Jones and Stokes Associates, Inc. 1985. Analysis of riparian vegetation on the eastside Sierra Nevada, California. Prepared for Southern California Edison Company, Rosemead, California, 10 July 1985.Google Scholar
  11. Kahrl, W. L. 1982. Water and power. University of California Press, Berkeley.Google Scholar
  12. Keating, J. M. 1982. Pine Creek Project, FERC no. 3258. Application for license to the Federal Energy Regulatory Commission.Google Scholar
  13. Riggs, H. C. 1972. Low-flow investigations. Techniques of water resource investigations of the U.S. Geological Survey. Book 4, ch. B1. Washington, D.C.Google Scholar
  14. Risser, R. J. 1986. Relationship between streamflow and riparian zone width for diverted eastern Sierra Nevada streams. Unpublished notes for presentation at workshop on riparian vegetation, November 1985, Pacific Gas and Electric Company, San Ramon, California.Google Scholar
  15. Risser, R. J., C. A. Fox, F. J. Lang, and T. C. Messick. 1984. Proceedings of a workshop on instream flow requirements for riparian vegetation in the Sierra Nevada, California, April 1984, Sacramento, California. Pacific Gas and Electric Company, Department of Engineering Research, San Ramon, California.Google Scholar
  16. Taylor, D. W. 1982. Eastern Sierra riparian vegetation: ecological effects of stream diversions. Contribution no. 6, Mono Basin Research Group, Report to Inyo National Forest.Google Scholar
  17. Warner, R. E., and K. M. Hendrix. 1984. California riparian systems. University of California Press, Berkeley.Google Scholar
  18. Wong, D., and M. Shumway. 1985. Owens River drainage and Mono Basin water diversion, cumulative impact summary. California Department of Fish and Game, Region 5, Division of Inland Fisheries. Internal Memorandum, 11 January 1985.Google Scholar
  19. Yao, K. M., M. T. Habibian, and C. R. O'Melia. 1971. Water and waste water filtration: concepts and applications.Environmental Science and Technology 5:1105–1112.Google Scholar

Copyright information

© Springer-Verlag New York Inc. 1987

Authors and Affiliations

  • G. Mathias Kondolf
    • 1
  • J. Warren Webb
    • 2
  • Michael J. Sale
    • 2
  • Thomas Felando
    • 3
  1. 1.Department of Geography and Environmental EngineeringJohns Hopkins UniversityBaltimoreUSA
  2. 2.Environmental Sciences DivisionOak Ridge National LaboratoryOak RidgeUSA
  3. 3.Inyo National ForestBishopUSA

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