Greg Koltun

Education:

Master of Science, Civil Engineering, The Ohio State University

Bachelor of Science, Microbiology, The Ohio State University

Professional Affiliations:

Member - American Society of Civil Engineers

Professional Experience:

1980 - Present                           Hydrologist, U.S. Geological Survey, Columbus, Ohio

1978 - 1980                              Environmental Scientist, Ohio E.P.A., Columbus, Ohio

Publications:

Farmer, William F. and Koltun, G.F., 2017, Geospatial tools effectively estimate nonexceedance probabilities of daily streamflow at ungauged and intermittently gauged locations in Ohio, Journal of Hydrology: Regional Studies, Vol. 13, Pages 208-221, ISSN 2214-5818, https://doi.org/10.1016/j.ejrh.2017.08.006.

Koltun, G.F., Nardi, M.R., and Shaffer, K.H., 2016, Estimation of upstream water use with Ohio’s StreamStats application: U.S. Geological Survey Scientific Investigations Report 2016–5077, 13 p., http://dx.doi.org/10.3133/sir20165077.

Huitger, C.A, Ostheimer, C.J., and Koltun, G.F., 2016, Hydrologic and hydraulic analyses for the Black Fork Mohican River Basin in and near Shelby, Ohio: U.S. Geological Survey Scientific Investigations Report 2015–5187, 39 p., 2 appendixes, http://dx.doi.org/10.3133/sir20155187.

Ebner, Andrew, Koltun, G.F., and Ostheimer, C.J., 2015, Hydrologic effects of potential changes in climate, water use, and land cover in the Upper Scioto River Basin, Ohio: U.S. Geological Survey Scientific Investigations Report 2015–5024, 34 p., 7 app., http://dx.doi.org/10.3133/sir20155024.

Koltun, G.F., 2015, An evaluation of the accuracy of modeled and computed streamflow time-series data for the Ohio River at Hannibal Lock and Dam and at a location upstream from Sardis, Ohio: U.S. Geological Survey Open-File Report 2015–1058, 23 p., http://dx.doi.org/10.3133/ofr20151058.

Koltun, G.F., 2014, An analysis of potential water availability from the Charles Mill, Clendening, Piedmont, Pleasant Hill, Senecaville, and Wills Creek Lakes in the Muskingum River Watershed, Ohio: U.S. Geological Survey Scientific Investigations Report 2014–5071, 61 p., http://dx.doi.org/10.3133/sir20145071.

Koltun, G.F., 2013, An analysis of potential water availability from the Atwood, Leesville, and Tappan Lakes in the Muskingum River Watershed, Ohio (ver. 1.1, January 2014): U.S. Geological Survey Scientific Investigations Report 2013–5112, 33 p., http://dx.doi.org/10.3133/sir20135112.

Koltun, G.F., and Kula, S.P., 2013, Methods for estimating selected low-flow statistics and development of annual flow-duration statistics for Ohio: U.S. Geological Survey Scientific Investigations Report 2012–5138, 195 p., http://pubs.usgs.gov/sir/2012/5138.

Koltun, G.F., and Holtschlag, D.J., 2010, Application of AFINCH as a tool for evaluating the effects of streamflow-gaging-network size and composition on the accuracy and precision of streamflow estimates at ungaged locations in the Southeast Lake Michigan Hydrologic Subregion: U.S. Geological Survey Scientific Investigations Report 2010–5020, 14 p., https://pubs.er.usgs.gov/publication/sir20105020.

Bushon R.N., Kephart C.M., Koltun G.F., Francy D.S., Schaefer F.W. 3rd, and Lindquist, Alan H.D., 2010, Statistical assessment of DNA extraction reagent lot variability in real-time quantitative PCR: Letters in Applied Microbiology, Vol.50, Issue 3, pp. 276–282 , https://pubs.er.usgs.gov/publication/70037289.

Koltun, G. F., 2009, Annual Peak-Flow Frequency Characteristics and (or) Peak Dam-Pool-Elevation Frequency Characteristics of Dry Dams and Selected Streamflow-Gaging Stations in the Great Miami River Basin, Ohio: U. S. Geological Survey Scientific-Investigations Report 2009-5177, 15 p., https://pubs.er.usgs.gov/publication/sir20095177

Tertuliani, J.S., Alvarez, D.A., Furlong, E.T., Meyer, M.T, Zaugg, S.D., and Koltun, G.F., 2008, Occurrence of organic wastewater compounds in the Tinkers Creek Watershed and selected other tributaries to the Cuyahoga River, Northeast Ohio: U.S. Geological Survey Scientific Investigations Report 2008-5173, 60 p., https://pubs.er.usgs.gov/publication/sir20085173.

Sherwood, James M., Huitger, Carrie A., Ebner, Andrew D., and Koltun, G.F., 2008, Morphological analyses and simulated flood elevations in a watershed with dredged and leveed stream channels, Wheeling Creek, Eastern Ohio: U. S. Geological Survey Scientific-Investigations Report 2008-5133, 78 p., https://pubs.er.usgs.gov/publication/sir20085133.

Sherwood, James M., Ebner, Andrew D., Koltun, G. F. and Astifan, Brian M., 2007, Flood of June 22-24, 2006, in North-Central Ohio, With Emphasis on the Cuyahoga River Near Independence, Ohio: U. S. Geological Survey Scientific-Investigations Report 2007-5161, 18 p., https://pubs.er.usgs.gov/publication/sir20075161.

Koltun, G. F., Kula, Stephanie P., and Puskas, Barry M., 2006, A Streamflow Statistics (StreamStats) Web Application for Ohio: U. S. Geological Survey Scientific-Investigations Report 2006-5312, 62 p., https://pubs.er.usgs.gov/publication/sir20065312.

Koltun, G.F., Ostheimer, Chad J., and Griffin, Michael S., 2006, Velocity, bathymetry, and transverse mixing characteristics of the Ohio River upstream from Cincinnati: U. S. Geological Survey Open-File Report 2006-1959, online report at http://pubs.usgs.gov/of/2006/1159/.

Koltun, G.F., Eberle, Michael, Gray, J. R., and Glysson, G. D., 2006, User's manual for the Graphical Constituent Loading Analysis System (GCLAS): U. S. Geological Survey Techniques and Methods, Book 4, Chapter C1, 51 p., https://pubs.er.usgs.gov/publication/tm4C1.

Bingner, R., Czajkowski, K., Palmer, M., Coss, J., Davis, S. Stafford, J., Widman, N., Theurer, F., Koltun, G., Richards, P. and Friona, T., 2005, Upper Auglaize Watershed AGNPS Modeling Project - Final Report, variously paginated, online report at https://www.nrcs.usda.gov/wps/PA_NRCSConsumption/download?cid=nrcseprd1214412&ext=pdf

Bushon, R. N., and Koltun, G. F., 2004, Microbiological Water Quality in Relation to Water-Contact Recreation, Cuyahoga River, Cuyahoga Valley National Park, Ohio, 2000 and 2002 : U. S. Geological Survey Water- Resources Investigations Report 03-4333, 30 p., https://pubs.er.usgs.gov/publication/wri034333.

Koltun, G. F., 2003, Techniques for Estimating Flood-Peak Discharges of Rural, Unregulated Streams in Ohio, Second Edition: U. S. Geological Survey Water-Resources Investigations Report 03-4164, 76 p., https://pubs.er.usgs.gov/publication/wri034164.

Koltun, G. F., and Whitehead, M. T., 2002, Techniques for Estimating Selected Streamflow Characteristics of Rural, Unregulated Streams in Ohio: U. S. Geological Survey Water-Resources Investigations Report 02-4068, 50 p., https://pubs.er.usgs.gov/publication/wri024068.

Koltun, G.F., and Kunze, A.E., 2002, Trends in selected streamflow and stream-channel characteristics for the Chagrin River at Willoughby, Ohio: U. S. Geological Survey Water-Resources Investigations Report 02-4017, 14 p., https://pubs.er.usgs.gov/publication/wri024017.

Koltun, G.F., 2001, Hydrologic design of impounding reservoirs and side-channel reservoirs for water supply in Ohio: U. S. Geological Survey Water-Resources Investigations Report 01-4256, 418 p., https://pubs.er.usgs.gov/publication/wri014256.

McKallip, T.E., Koltun, G.F., Gray, J.R., and Glysson, G.D., 2001, GCLAS: A graphical constituent loading analysis system, Proceedings Federal Interagency Sedimentation Conference, Vol. 1, p. 49-55

Koltun, G.F., and Sherwood, J.M., Factors Related to the Probability of Joint Flooding on Paired Streams in Ohio, 1999, Transportation Research Record, Transportation Research Board - National Research Council, No. 1690, p. 175-185, https://pubs.er.usgs.gov/publication/70021231.

Koltun, G.F., 1999, Flood of June 28-29, 1998 in Ohio, U.S. Geological Survey Water-Resources Investigations Report 99-4192, 21 pp., https://pubs.er.usgs.gov/publication/wri994192.

Koltun, G.F., and Sherwood, J.M., 1998, Factors Related to the Joint Probability of Flooding on Paired Streams, U.S. Geological Survey Water- Resources Investigations Report 98-4238, 32 p., https://pubs.er.usgs.gov/publication/wri984238.

Myers, D.M., Koltun, G.F., and Francy, D.S., 1998, Effects of hydrologic, biological, and environmental processes on sources and concentrations of fecal bacteria in the Cuyahoga River, with implications for management of recreational waters in Summit and Cuyahoga counties, Ohio: Water-Resources Investigations Report 98-4089, 45 p., https://pubs.er.usgs.gov/publication/wri984089.

Koltun, G.F., 1996, Floods of December 28, 1990 - January, 2, 1991, in Ohio, in Summary of Floods in the United States during 1990 and 1991, U.S. Geological Survey Water-Supply Paper 2474, p. 163-166, https://pubs.er.usgs.gov/publication/wsp2474.

Koltun, G.F., 1996, Floods of June 8-9, 1990, in Central and South-Central Ohio, in Summary of Floods in the United States during 1990 and 1991, U.S. Geological Survey Water-Supply Paper 2474, p. 83-84, https://pubs.er.usgs.gov/publication/wsp2474.

Hambrook, J.A., Koltun, G.F., Palcsak, B.B., and Tertuliani, J.S., 1996, Hydrologic disturbance and response of aquatic biota in Big Darby Creek Basin, Ohio: U.S. Geological Survey Water-Resources Investigations Report 96-4315, variously paginated, https://pubs.er.usgs.gov/publication/wri964315.

Hambrook, J.A., and Koltun, G.F., 1996, Effects of hydrologic disturbance on washout and recolonization of stream biota, in Proceedings of the Sixth Federal Interagency Sedimentation Conference, March 10-14, 1996, v. 2, pp. VII-9 - VII-16

Koltun, G.F., 1995, Determination of base-flow characteristics at selected sites on the Mad River, Ohio: U.S. Geological Survey Water-Resources Investigations Report 95-4037, variously paginated, https://pubs.er.usgs.gov/publication/wri954037.

Koltun, G.F., Gray, J.R., and McElhone, T.J., 1994, User's manual for SEDCALC, A computer program for computation of suspended-sediment discharge: U.S. Geological Survey Open-File Report 94-459, 46 p., https://pubs.er.usgs.gov/publication/ofr94459.

Childress, C.J., and Koltun, G.F., 1993, Ohio stream water quality, in U.S. Geological Survey, National water summary 1990-91 -- Hydrologic events and stream water quality: U.S. Geological Survey Water-Supply Paper 2400, p. 437-444, https://pubs.er.usgs.gov/publication/wsp2400.

Koltun, G.F., and Roberts, J.W., 1990, Techniques for estimating flood-peak discharges of rural, unregulated streams in Ohio, U.S. Geological Survey Water-Resources Investigations Report 89-4126, https://pubs.er.usgs.gov/publication/wri894126.

Koltun, G.F., 1988, Analysis of postdredging bed-level changes in selected reaches of Wheeling Creek, eastern Ohio, 1985-87: Water-Resources Investigations Report 88-4119, 14 p., https://pubs.er.usgs.gov/publication/wri884119.

Kolva, J.R., and Koltun, G.F., 1987, Flooding and sedimentation in Wheeling Creek basin, Belmont County, Ohio: U.S. Geological Survey Water-Resources Investigations Report 87-4053, 33 p., https://pubs.er.usgs.gov/publication/wri874053.

Koltun, G.F., and Schwartz, R.R., 1987, Multiple-regression equations for estimating low flows at ungaged stream sites in Ohio: U.S. Geological Survey Water-Resources Investigations Report 86-4354, 39 p., https://pubs.er.usgs.gov/publication/wri864354.

Helsel, D.R., and Koltun, G.F., 1987, Evaluation of size-distribution effects and laboratory precision in the analysis of bottom materials: U.S. Geological Survey Water-Supply Paper 2310, p. 1-11. , https://pubs.usgs.gov/wsp/2310/report.pdf.

Koltun, G.F., and Helsel, D.R., 1986 Influence of size-fractioning techniques on concentrations of selected trace metals in bottom materials: U.S. Geological Survey Water-Resources Investigations Report 86-4114, 36 p., https://pubs.er.usgs.gov/publication/wri864114.

Koltun, G.F., and Helsel, D.R., 1986, Influence of particle-size separation technique on concentrations of sediment-associated trace metals: Proceedings of Meetings of American Geophy. Union, 1 p.

Koltun, G.F., 1985, Estimating annual suspended-sediment loads in the northern and central Appalachian coal region: U.S. Geological Survey Water-Resources Investigations Report 85-4215, 17 p., https://pubs.er.usgs.gov/publication/wri854215.