Limnological Phenomena in Impounded Rivers

Dams have been built in this century that impound virtually all major rivers in the United States. The purposes vary and include flood control, navigation, hydropower generation, and storage for irrigation and domestic uses. About 2,500 reservoirs of 5,000 acre-feet or more, store about 480 million acre-feet, about 1/4 of the annual runoff. Storage capacity is dominated by large reservoirs such that the 600 largest store more than 90 percent of the total. Lake Powell, behind Glen Canyon dam, stores water (ca. 27 million acre-feet) in the Upper Basin of the Colorado River for controlled release according to the Colorado River Compact (8.23 million acre-feet per year) and to generate electricity for sale to consumers in the Southwestern United States (about 80 percent of the generating capacity of the Colorado River Storage Project). Phenomena that control the quantity (evaporation, losses to ground water, consumptive uses in the basin, regional drought or El Nino effects, and so forth) and (or) quality (salinity , productivity, sediment-water column exchange, etc.) of Lake Powell waters are not understood. Specific objectives of this project are to initiate investigation of basic processes that mediate water quality in Lake Powell and to couple understanding of Lake Powell to management of water quality of the Colorado River in the Grand Canyon National Park.

REPORTS PUBLISHED 1999-2004

Marzolf, G.R., 2006, Citiation – Robert G. Wetzel Award for Excellence in Water Quality , Hydrological Science and Technology, vol. 22, no. 1-4, p. 219-221

Noe, G.B., Scinto, L.J., Taylor, J., Childers, D.L., and Jones, R.D., 2003, Phosphorus cycling and partitioning in oligotrophic Everglades wetland ecosystems: A radioisotope study: Freshwater Biology, v. 48, no. 11, p. 1993-2008. (on-line abstract)

Flynn, M.E., Hart, R.J., Marzolf, G.R. Bowser, C.J., 2001, Daily and Seasonal variability of pH, dissolved oxygen, temperature and specific conductance in the Colorado River between the forebay of Glen Canyon Dam and Lees Ferry Northeast Arizona , 1998-99: U.S. Geological Survey Open-file Report 01-222. (on-line abstract and on-line report, 755kb)

Marzolf, G.R., Bowser, C.J., and Hart, R.J., 2000, The withdrawal zone in Lake Powell reservoir during a controlled flood through Glen Canyon Dam on the Colorado River-Arizona, USA: Verh. Verein. Limnol., v. 27, p. 2440-2443.

Marzolf, G.R., 1999, Effects of flooding on plant production downstream from Glen Canyon Dam; Grand Canyon Monitoring and Research Program: U.S. Geological Survey Fact Sheet FS-060-99. (on-line fact sheet)

Marzolf, G.R., Bowser, C.J., Hart, R.J., Stephens, D.W., and Vernieu, W.S., 1999, Photosynthetic and respiratory processes: an open-stream approach, in Webb, R.H., Schmidt, J.C., Marzolf, G.R., and Valdez, R.A., eds., the 1996 controlled flood in Grand Canyon: American Geophysical Union Monograph no. 110, p. 205-216. (on-line abstract)

Marzolf, G.R., Jackson, W., and Randle, R., 1999, Flood releases from dams as management tools: interactions between science and management, in Webb, R.H., Schmidt, J.C., Marzolf, G.R., and Valdez, R.A., eds., the 1996 controlled flood in Grand Canyon: American Geophysical Union Monograph no. 110. (on-line abstract)

Schmidt, J.C., Andrews, E.D., Wegner, D.L., Patten, D.T., Marzolf, G.R., and Moody, T.O., 1999, Origins of the 1996 controlled flood in Grand Canyon, in Webb, R.H., Schmidt, J.C., Marzolf, G.R., and Valdez, R.A., eds., the 1996 controlled flood in Grand Canyon: American Geophysical Union Monograph no. 110, p. 23-36. (on-line abstract)

Webb, R.H., Schmidt, J.C., Marzolf, G.R., and Valdez, R.A., 1999, The controlled flood in Grand Canyon: American Geophysical Union Monograph no. 110, 367 p. (on-line information)

For information on additional projects in the National Research Program, see Indexes to NRP projects and bibliographies