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Michael Reddy

Research Hydrologist

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Short Biography

Michael Reddy, a Supervisory Hydrologist in the National Research Program, Denver, Colorado, received his Ph.D. in chemistry from the State University of New York at Buffalo (SUNY).  He was a research assistant at Western New York Nuclear Research Center, Buffalo, an instructor in physical chemistry at Millard Fillmore College (SUNY) at Buffalo, an instructor in the Chemistry Department (SUNY) at Buffalo, a research scientist at the New York State Department of Health in Albany, New York and visiting scientist at the U.S. Geological Survey National Headquarters in Reston.  Dr. Reddy has been Project Chief of the Aqueous Crystal Growth and Dissolution Kinetics of Earth Surface Materials project since 1983.  Research topics include studies on carbonate mineral growth and dissolution in aqueous solution containing natural organic matter. 

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Reddy, M.M., 2013, Calcite growth rate inhibition by low molecular weight polycarboxylate ion. In: Amjad, Z. (Ed.), Mineral Scales in Biological and Industrial Systems, Edition 3, Chapter 2. CRC Press, Boca Raton, FL., pp. 15-40. [Link]

Reddy, M.M., 2012, Calcite growth-rate inhibition by fulvic acid and magnesium ion -- possible influence on biogenic calcite formation: Journal of Crystal Growth, V. 352, p. 151-154, (on-line journal article). DOI:10.1016/j.jcrysgro.2011.12.069 [Link]

Reddy, M.M. and Hoch, A., 2012, Calcium carbonate nucleation in an alkaline lake surface water, Pyramid Lake, Nevada, USA. Aquatic Geochemistry, v. 18, No. 2, p. 95-113. (on-line journal article). DOI: 10.1007/s10398-011-9150-3. [Link]

Reddy, M.M. and Gunther, C.D., 2012, Summary of chemical data from onsite and laboratory analyses of groundwater samples from the surficial aquifer, Las Vegas, Nevada, April and August 1993 and September 1994. U.S. Geological Survey Open-File Report 2012-1029, 18 p. (on-line report) [Link]

Reddy, M.M. and Gunther, C.D., 2012, Summary of data from onsite and laboratory analyses of surface water and marsh porewater from South Florida Water Management District Water Conservation Areas, the Everglades, South Florida, March 1995, U.S. Geological Survey Open-File Report 2012-1063, p. 14. (on-line report) [Link]

Reddy, M.M. and Leenheer, J., 2011, Calcite growth-rate inhibition by fulvic acids isolated from Big Soda lake, Nevada, USA, The Suwannee River, Georgia, USA and by polycarboxylic acids: Annals of Environmental Science, v. 5, p. 41-53. (on-line journal article) [Link]

George D. Redden Yoshiko Fujita Yi-Lin Fang T.D. Scheibe A.M. Tartakovsky Mikala Beig Joanna Taylor Robert W. Smith Michael M. Reddy Shelly Kelly, 2007, Fluid Flow, Solute Mixing and Precipitation In Porous Media, Annual Environmental Remediation Science Program (ERSP) Principal Investigator Meeting, April 16-19, 2007, Lansdowne, VA [Download File]

Redden, G., Tartakovsky, A., Scheibe, T., Fjuita, Y., Smith, R., Reddy, M., Kelly, S., 2006, Coupling between flow and precipitation in heterogeneous subsurface environments and effects on contaminant fate and transport, abstract presented in the Book of Abstracts - ERSP Meeting, April 3-5, 2006, Warrentown, VA. [Download File]

 Selected Publications:

Halm, D.R., Beaver, L.D., Leavesley, G.H., and Reddy, M.M., 2009, Meteorological Data near Rabbit Ears Pass, Colorado, U.S.A., 1984 – 2008: U.S. Geological Survey Data Series 415, 2 p. (on-line abstract and to download data or on-line report in pdf format, 6.9 MB)

Leenheer, J.A., and Reddy, M.M., 2008, Co-Precipitation of Dissolved Organic Matter by Calcium Carbonate in Pyramid Lake, Nevada : Annals of Environmental Science, v. 2, p. 11-25. (on-line abstract or on-line article in pdf format, 221 KB)

Reddy, M.M., Reddy, M.B., Kipp, K.L., Burman, A., Schuster, P., Rawlik, Jr., P.S., 2008, Peat porewater chloride concentration profiles in the Everglades during wet/dry cycles from January 1996 to June 1998: field measurements and theoretical analysis: Hydrological Processes, v. 22, p. 1713-1724. (on-line abstract)


Reddy, M.M., Schuster, P., Kendall, C., and Reddy, M.B., 2006, Characterization of surface and ground water δl8O seasonal variation and its use for estimating groundwater residence times: Hydrological Processes, v. 20, no. 8, p. 1753-1772. (on-line abstract of journal article)


Reddy, M. M., Schuster, P., Kendall, C., and Reddy, M.B., 2006, Reply to comment on "Characterization of surface and ground water δl8O seasonal variation and its use for estimating groundwater residence times" by R.E. Criss, and W.E. Winston: Hydrological Processes, v. 20, no. 16, p. 3573-3578. (on-line pdf report)


Reddy, M., 2005, Calcite crystal growth inhibition by aquatic humic substances - can humic substances serve as carbonate scale inhibitors?  This abstract presented in the Book of Abstracts - Humic Science & Technology VIII Conference, Boston, MA, March 16-18, 2005.


Reddy, M.M., Reddy, M.B., Reddy, C.F., 2004, Scientific advances provide opportunities to improve pediatric environmental health: Journal of Pediatrics, v. 145, No. 2, p. 153-156. (on-line journal article)


Reddy, M.M., and Aiken, G.R., 2001, Fulvic acid-sulfide ion competition for mercury ion binding in the Florida Everglades: Water, Air and Soil Pollution, v.132, p. 89-104.  (on-line report) or (on-line abstract)


Reddy, M.M. and Hoch, A.R., 2001, Calcite crystal growth rate inhibition by polycarboxylic acids: Journal of Colloid and Interface Science, v. 235, p. 365-370. (on-line abstract) or (electronic file)


Reddy, M.M. and Hoch, A.R., 2000, Calclite crystal growth rate inhibition, Advances in crystal growth inhibition technologies, edited by Amjad, Kluwer Academic/Plenum Publishers, New York, p. 107-121. (electronic file)


Reddy, M.M., 1997, Book review of chemical water treatment, principles and practice by H. Roques: Journal of Hydrology, v. 195, p. 385-388. (electronic file)


Reddy, M.M., Schuster, P.F., Puckett, L., Meyers, T., 1997, Atmospheric input to the Shingobee River headwaters area, in Winter, T.C., ed., Interdisciplinary research initiative: Hydrological and biogeochemical researach in the Shingobee River headwateras area, north-central Minnesota: U.S. Geological Survey Water Resources Investigations Report 96-4215, p. 47-53. (electronic file)


Reddy, M.M., 1995, Carbonate precipitation in Pyramid Lake, Nevada - Probable control by magnesium ion, ed., Zahid Amjad, Mineiral Scale Formation and Inhibition, Plenum Press, New York, p. 21-32. (electronic file)


Reddy, M.M. and Leith, S.D., 1994. Dry deposition of sulfur to limestone and marble: Preliminary evaluation of a process based model: Proceedings of the 3rd International Symposium for the Conservation of Monuments in the Mediterranean Basin, Venice, Italy, June 22-25, 1994, p. 185-187. (electronic file)


Reddy, M.M., 1989, Preserving and protecting monuments and historical sites:  Environmental Science and Technology, v. 23, p. 264-265. (electronic file) 


Reddy, M.M., 1988, Physical-chemical mechanisms that affect regulation of crystallization in chemical aspects of regulation of mineralization, in eds., C. Steven Sikes and A.P. Wheeler, Proceedings of a symposium sponsored by the Division of Industrial and Engineering Chemistry of the American Chemical Society, University of South Alabama Publications Services, Mobile, Alabama, p. 1-8. (electronic file)


Reddy, M.M., 1986, Effect of magnesium ions on calcium carbonate nucleation and crystal growth in dilute aqueous solutions at 25O Celsius, in Studies in Diageneses: U.S. Geological Survey Bulletin 1578, p. 169-182. (electronic file)


Reddy, M.M., Sherwood, S. and Doe, B., 1985, Modeling limestone dissolution by acid rain, Proceedings of Research and Design 85 Symposium, Los Angeles, CA, March 14-18, 1985, The American Institute of Architects Foundation, Washington, D.C., p. 383-388. (electronic file)


Reddy, M.M., Plummer, L. Niel, Busenberg, E., 1981, Crystal growth of calcite from calcium bicarbonate solutions at constant PCO2 and 25oC: A test of a calcite dissolution model: Geochimica et Cosmochimica Acta, v. 45, p. 1281-1289. (electronic file)


Reddy, M.M., and Nancollas, G. H., 1971, The crystallization of calcium carbonate I. Isotopic exchange and kinetics: Journal of Colloid and Interface Science, v. 36, no. 2, p. 166-172. (electronic file)















My Science Topics

Science Topic
Water Resourcesaquifers
Water Resourcesground water
Water Resourcesground-water quality
Water Resourcesindustrial water use
Water Resourceslakes
Water Resourcessurface water
Water Resourcessurface water quality
Water Resourceswater properties
Water Resourceswater quality
Water Resourceswater use

My USGS Science Strategy Areas

Climate Variability & Change

Aqueous Crystal Growth and Dissolution Kinetics of Earth Surface Minerals

Image of Current Focus for Aqueous Crystal Growth and Dissolution Kinetics of Earth Surface Minerals

Techniques of  low-temperature geochemistry are used for interpretation and characterization of chemical processes occurring in surface water and ground water. However, metal binding by dissolved organic matter and crystal growth and dissolution reaction rate mediation by dissolved constituents are poorly understood. Metal ion speciation and mineral formation rates influend water reactivity, water quality and carbon storage.  Metal ion complexation with natural dissolved organic matter is important for understanding metal ion reactivity in surface water and ground water -- metal ion speciation controls metal ion chemical and biogeochemical reactivity and bioavailability.    Research includes determining equilibrium metal species distributions in surface and ground water containing natural dissolved organic matter, and characterizing crystal growth and dissolution rates in surface and ground water containing dissolved organic material.  

Calcium carbonate formation in Pyramid Lake, Nevada

Image of Calcium carbonate formation in Pyramid Lake, Nevada

Dr. Reddy has studied calcium carbonate formation in Pyramid Lake, Nevada since 1992.  The picture above shows calcium carbonate formation in Pyramid lake, Nevada caused by mixing hydrothermal water witih lake water.

Contact Information

Michael Reddy
Lakewood, CO 80225
303-236-5968 - Fax
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