Presentations

Halford, K.J., 2023, Historical Evolution of Conceptual Models of Furnace Creek Discharge, 2023 Devils Hole workshop, Longstreet, Nevada, April 26 PRESENTED

Halford, K.J. and Erica Gallegos, 2023, Mapping Contours of Pre-Mining, Water Levels to a Water-Table Surface, Nevada Water Resources Association Annual Conference, Reno, Nevada, January 26 PRESENTED

Halford, K.J., 2022, Challenges of Managing Water Resources with Numerical Flow Models, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, February 2 PRESENTED

Halford, K.J., 2021, Historical Evolution of Conceptual Models of Furnace Creek Discharge, Reno, Nevada, January 26 PRESENTED

Halford, K.J., 2020, Panel: Springs in Nevada 2: Managing and Understanding Impacts to Springs, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, February 12 INVITED

Halford, K.J., 2020, Maxey-Eakin Approach for Local Flow Constraints, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, February 13 PRESENTED

Zhan, J. and K.J. Halford, 2020, Pit Lake Iterative Simulation Model (PLISM): A Pit Lake Iterative, Analytical Solution, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, February 13 PRESENTED

Halford, K.J., 2019, Look Beyond the Objective Function for Reasonable Models, Nevada Water Resources Association Mine Water Management Symposium, Reno, Nevada, January 28-29

Halford, K.J., 2018, Effects of Local and Regional Pumping on Water Levels in Devils Hole, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, March 1 PRESENTED

Halford, K J, 2017, Complex Models Require Looking and Comparing, MODFLOW and More 2017: Modeling for Sustainability and Adaptation – International Groundwater Modeling Conference, May 21 – 24, 2017

Jackson, T.R. and K.J. Halford, 2017, Evaluating Potential Groundwater Pumping Effects in Pahrump Valley on 38 Water Resources in the Amargosa Wild and Scenic River, Nevada and California, MODFLOW and More 2017: Modeling for Sustainability and Adaptation – International Groundwater Modeling Conference, May 21 – 24, 2017

Jackson, T.R., K.J. Halford, and P. Gardner, 2017, Evaluating Micrometeorological Estimates of Groundwater Discharge from Great Basin Desert Playas, Abstract H12B-01 at 2017 Fall Meeting, AGU, New Orleans, La., 11 Dec. PRESENTED

Halford, K.J., T.R. Jackson, and Joe Fenelon, 2017, Differentiating Natural and Anthropogenic Groundwater-Level Changes in Critical Habitats: An Example from Devils Hole, Nevada, Abstract H53O-02 at 2017 Fall Meeting, AGU, New Orleans, La., 15 Dec. PRESENTED

Halford, K.J., 2017, Confirming Connection between AFFCR and Ash Meadows Groundwater Basins, presented at 2017 Devils Hole workshop, Beatty, Nevada, 2 May PRESENTED

Halford, K.J., 2016, Estimating Hydraulic Properties with Stress-Specific Groundwater Models, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, March 1-3 PRESENTED

Jackson, T.R. and K.J. Halford, 2016, Effects of Amargosa Desert Groundwater Withdrawals on Discharge at Furnace Creek Springs, Southern Nevada, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, March 1-3 PRESENTED

Halford, K J, 2016, Increase Model Certainty with Transmissivity Observations, NGWA Groundwater Summit, Denver, CO, April 27 PRESENTED https://ngwa.confex.com/ngwa/2016gws/webprogram/Paper10888.html

Halford, K.J. and Joe Fenelon, 2016, Detecting Distant Drawdowns with Water-Level Modeling, U.S. Geological Survey – National Ground-Water Meeting, Reno, Nevada, August 31, 2016, PRESENTED

Halford, K.J., 2016, Estimating Hydraulic Properties with Stress-Specific Groundwater Models, U.S. Geological Survey – National Ground-Water Meeting, Reno, Nevada, August 29 – September 2, 2016, PRESENTED

Halford, Keith, Peter Godfrey, and Noel Ludwig, 2015, Quick Answers with Groundwater Models, Nevada Water Resources Association Annual Conference, Reno, Nevada, January 28-31 PRESENTED

Garcia, C.A., Jena Huntington, K.J. Halford, and M.T. Moreo, 2015, Estimating Groundwater Discharge from Two Great Basin Playas: A Minor Groundwater Resource, Nevada Water Resources Association Annual Conference, Reno, Nevada, January 28-31 PRESENTED

Jackson, T.R., K.J. Halford, and C.A. Garcia, 2015, Estimating Groundwater Discharge from Playas with Variable-Density Simulations, Nevada Water Resources Association Annual Conference, Reno, Nevada, January 28-31 PRESENTED

Halford, K J, 2015, Increase Model Certainty with Transmissivity Observations, NGWA Groundwater Summit, San Antonio, TX, March 16 PRESENTED https://ngwa.confex.com/ngwa/2015gws/webprogram/Paper10275.html

Garcia, C.A., Jena Huntington, and K.J. Halford, 2015, Estimating Groundwater Discharge from Two Great Basin Playas: A Minor Groundwater Resource, NGWA Groundwater Summit, San Antonio, TX, March 18 PRESENTED https://ngwa.confex.com/ngwa/2015gws/webprogram/Paper10301.html

Jackson, T.R., C.A. Garcia, K.J. Halford, and Jena Huntington, 2015, Estimating Groundwater Discharge from Playas with Variable-Density Simulations, NGWA Groundwater Summit, San Antonio, TX, March 16 PRESENTED https://ngwa.confex.com/ngwa/2015gws/webprogram/Paper10240.html

Halford, K.J. and Joe Fenelon, 2015, Delineating Groundwater Basins in the Great Basin, the Pahute Mesa–Oasis Valley example, presented at 2015 Devils Hole workshop, Ash Meadows National Wildlife Refuge Visitors Center, Amargosa Valley, Nevada, 6-8 May PRESENTED

Jackson, T.R., K.J. Halford, and C.A. Garcia, 2015, Estimating Groundwater Discharge from Playas with Variable-Density Simulations, presented at 2015 Devils Hole workshop, Ash Meadows National Wildlife Refuge Visitors Center, Amargosa Valley, Nevada, 6-8 May PRESENTED

Halford, K J, 2015, Increase Model Certainty with Transmissivity Observations, MODFLOW and More 2015: Modeling a Complex World – International Groundwater Modeling Conference, May 31-June 3

Halford, Keith, 2014, Improving Groundwater Models with Transmissivity Observations, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, February 4-6 PRESENTED

Halford, Keith, 2014, Improving Groundwater Models with Transmissivity Observations, presented at 2014 Devils Hole workshop, Furnace Creek, Calif., Thursday, May 1 PRESENTED

Halford, K.J. and Joe Fenelon, 2014, Detecting Distant Drawdowns with Water-Level Modeling, NGWA Groundwater Summit, Denver, CO, May 7 PRESENTED

Jackson, T.R., C.A. Garcia, K.J. Halford, Nancy Damar, J.M. Fenelon, 2014, Integrated Analysis of 10 Large-Scale Multi-Well Aquifer Tests at Pahute Mesa, presented at DOE Technical Information Exchange, Las Vegas, Nevada, July 16 PRESENTED

Jackson, T.R., C.A. Garcia, K.J. Halford, Donald Sweetkind, J.M. Fenelon, 2014, Improving Regional Groundwater Models with Transmissivity Observations, presented at DOE Technical Information Exchange, Las Vegas, Nevada, July 16 PRESENTED

Jackson, T.R., K.J. Halford, and C.A. Garcia, 2014, Quantifying Hydraulic Properties and Connections between Structural Blocks at Pahute Mesa, Nevada National Security Site, Abstract H53B-0858 at 2014 Fall Meeting, AGU, San Francisco, Calif., 19 Dec. PRESENTED

Halford, Keith, 2013, Reporting Flow Model Results for Groundwater Development, Nevada Water Resources Association Annual Conference, Reno, Nevada, January 28-31 PRESENTED

Halford, Keith, 2013, Detecting Distant Drawdowns with Water-Level Modeling, 2013 Ground Water Summit, San Antonio, TX, April 28 – May 2 SEQUESTERED despite reimbursable funds

Halford, K J, 2013, Essential Reporting for Comprehending Groundwater Models, presented at 2013 Devils Hole workshop, Furnace Creek, Calif., 1-3 May PRESENTED

Mirus, B B, K J Halford, D S Sweetkind, and J M Fenelon, 2013, Testing the Hydrologic Utility of Geologic Frameworks at Pahute Mesa, presented at 2013 Devils Hole workshop, Furnace Creek, Calif., 1-3 May PRESENTED

Halford, K J, 2013, Increase Certainty with Transmissivity Observations, MODFLOW and More 2013: Translating Science into Practice – International Groundwater Modeling Conference, June 2 – 5 SEQUESTERED despite reimbursable funds

Halford, K J, 2013, Using and Reporting Groundwater Models, American Bar Association Meeting 31st Annual Water Law Conference, June 6, Las Vegas, NV INVITED

Halford, K J, 2013, Aquifer Characterization and Simulation of Well Modification with AnalyzeHOLE, The 7th Symposium in GRA’s Series on Tools and Technologies “High Resolution Tools and Techniques for Optimizing Groundwater Extraction for Water Supply” Symposium, June 19, Garden Grove, CA INVITED

Halford, K J and Fenelon, J M, 2013, Detecting Distant Drawdowns with Water-Level Modeling, 29th Biennial Groundwater Conference & 22nd GRA Annual Meeting October 8-9, Sacramento, CA FURLOGHED

Halford, K J and Fenelon, J M, 2013, Detecting Effects of Distant Groundwater Development, Abstract 265-4, Geological Society of America Abstracts with Programs, Vol. 45, No. 7, p. 490 PRESENTED

Halford, K J, 2013, Improving Regional Groundwater Models with Transmissivity Observations, Abstract H11H-1246 at 2013 Fall Meeting, AGU, San Francisco, Calif., 9-13 Dec. PRESENTED

Halford, K J and Fenelon, J M, 2012, Detecting Effects of Distant Groundwater Development, presented at 2012 Devils Hole workshop, Furnace Creek, Calif., 2-3 May PRESENTED

Fenelon, J M and Halford, K J, 2012, Detecting Distant Drawdown in Amargosa Desert From Pumping at Yucca Flat, Nevada National Security Site, presented at 2012 Devils Hole workshop, Furnace Creek, Calif., 2-3 May PRESENTED

Halford, K.J., 2012, Multiple, Simple Groundwater Models Maximize Results, U.S. Geological Survey – National Ground-Water Meeting, Lakewood, Colorado, August 6-10, 2012, PRESENTED

Halford, K J, Fenelon, J M, Garcia, C, and Sweetkind, D S, 2012, Testing Hydrologic Utility of Geologic Frameworks, U.S. Geological Survey – National Ground-Water Meeting, Lakewood, Colorado, August 6-10, 2012, PRESENTED

Halford, K.J., 2012, Testing Hydrologic Utility of Geologic Frameworks, Abstract 265-4, Geological Society of America Abstracts with Programs, Vol. 44, No. 7, p. 617 PRESENTED

Halford, Keith, 2011, Effects of Groundwater Development—Not that Uncertain, Nevada Water Resources Association Annual Conference, Reno, Nevada, February 1-3 PRESENTED

Fienen, M. N., K. Halford, and D. Hart. 2011, Integrated Interpretation of Borehole Flow, Aquifer-Test Results, and Spring Discharge—Culver Springs, Wisconsin. AWRA – Wisconsin Section Annual Meeting March 3-4. Appleton, WI.

Halford, Keith, 2011, Effects of Groundwater Development—Not that Uncertain, Ground Water Summit and 2011 Ground Water Protection Council Spring Meeting, Baltimore, MD, May 1-5 PRESENTED

Halford, K J, Fenelon, J M, Garcia, C, and Sweetkind, D S, 2011, Assessing Hydraulic Connections across Fault Structures, Pahute Mesa, Nevada, MODFLOW and More: Integrated Hydrologic Modeling – International Groundwater Modeling Conference, June 5-8 PRESENTED

Sweetkind, D S, Halford, K J, and Belcher, W B, 2011, Development and Use of Hydrostratigraphic Nomenclature in the Southwestern Nevada Volcanic Field, Nevada, Geological Society of America Abstracts with Programs, Vol. 43, No. 5 , p. 28 PRESENTED

Garcia, C, Halford, K J, and Fenelon, J M, 2011, Detecting Distant Drawdowns with Theis Transforms, Abstract H13A-1175 at 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec. PRESENTED

Huntington, J, Halford, K J, and Garcia, C, 2011, Development of Saline Flow Systems in Closed Basins, Abstract H11E-1091 presented at 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec. PRESENTED

Halford, K J, Sweetkind, D S, Fenelon, J M, and Garcia, C, 2011, Geologic Frameworks and Faulty Hydrology, Abstract H13A-1165 at 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec. PRESENTED

Halford, Keith, 2010, Directly Assessing Hydrologic Effects with Drawdown Models, Nevada Water Resources Association Annual Conference, Las Vegas, Nevada, March 2–4 PRESENTED

Johnson, Carole D., Day-Lewis, Frederick D., Paillet, Frederick L., Halford, Keith J., and Williams, John H., 2010, FLASH – A Program for Flow-Log Analysis of Single Holes, Abstract 273-7, Geological Society of America Abstracts with Programs, Vol. 42, No. 5 , p. 639 PRESENTED

Garcia, C, Fenelon, J M, Halford, K J, and Sweetkind, D S, 2010, Assessing Hydraulic Connections Across Structural Blocks, Pahute Mesa, Nevada—Detecting Distant Drawdowns, Abstract H13D-0989 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec. PRESENTED

Halford, K J, Fenelon, J M, Garcia, C, and Sweetkind, D S, 2010, Assessing Hydraulic Connections Across Structural Blocks, Pahute Mesa, Nevada—Interpreting Hydraulic Properties, Abstract H13D-0988 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec. PRESENTED

Halford, K.J., 2009, Directly Assessing Hydrologic Effects with Drawdown Models, NGWA Press, The 2009 Ground Water Summit—The Science and Engineering Conference: Adapting to Increasing Demands in a Changing Climate, April 19-23, 2009, Tucson, AZ, p. XX. PRESENTED.

Phelps, G., Boucher, A. and Halford, K., 2009, Using Nearest Neighbor, Sequential Indicator Simulation, and Single Normal Equation Simulation Interpolators to Calculate Bulk Hydraulic Conductivity within an Alluvial Fan: International Association for Mathematical Geosciences Annual Conference, Stanford University, California, 23-28 August.

Halford, Keith, 2009. Regularized Interpretation of Flow Logs with AnalyzeHOLE, 2009 PEST Conference, Potomac, Maryland, November 2–4 PRESENTED

Stamos, C.L., Nishikawa, T., Martin, P., Everett, R.R., and Halford, K.J., 2008, Identification of Sources and Management of Arsenic from Wells in Antelope Valley, CA, Western Region Water Science Symposium, Portland, OR, March 18-20, 2008, INVITED

Halford, K.J., 2008, AnalyzeHOLE, Interpreting Flow Logs with an Integrated Wellbore Analysis Tool, Western Region Water Science Symposium, Portland, OR, March 18-20, 2008, INVITED

Halford, K.J. and Stamos, C.L., 2008, AnalyzeHOLE, Interpreting Flow Logs with an Integrated Wellbore Analysis Tool, MODFLOW and More: Ground Water and Public Policy – International Groundwater Modeling Conference, May, 2008 PRESENTED

Halford, K.J., Garcia, C.A., and Laczniak, R J, 2008, Interpreting Flow Logs with an Integrated Wellbore Analysis Tool, AnalyzeHOLE, EOS Trans. AGU, 89(53), Fall Meet. Suppl., Abstract H32A-03 PRESENTED

Garcia, C.A., Halford, K.J., and Laczniak, R J, 2008, Determining Heterogeneity of Lithologic Units from Flow Logs and Aquifer Tests, EOS Trans. AGU, 89(53), Fall Meet. Suppl., Abstract H32A-04 PRESENTED

Halford, K.J., 2007, Aquifer test analysis utilizing numerical models and inverse methods, Abstract 40-4, Geological Society of America Abstracts with Programs, Vol. 39, No. 6, p. 110 PRESENTED

Halford, K.J., 2006, Interpreting hydrogeologic columns with multiple aquifer tests and a moving-model approach, MODFLOW and More 2006 – International Groundwater Modeling Conference, May, 2006 PRESENTED

Halford, K.J., 2006, Vertical leakance estimates using multiple aquifer tests and a moving-model approach, Abstract 2-12, Geological Society of America Abstracts with Programs, Vol. 38, No. 7, p. 18 PRESENTED

Halford, W.P., Halford, K.J., A.T. Pierce, J. DeSalvo, T.P. Foster, A. Kosinski, S.K. Weller, and B.M. Gebhardt. 2005. Interferon-b and IFN-g synergize to disrupt the productive cycle of herpes simplex virus type 1 replication. Experimental Biology, April 2 – 6, San Diego, CA. INVITED

Halford, W.P., Halford, K.J., A.T. Pierce, J. DeSalvo, T.P. Foster, A. Kosinski, S.K. Weller. 2005. Interferon-b and IFN-g synergize to disrupt the productive cycle of herpes simplex virus type 1 replication. 31st International Herpesvirus Workshop, July 29 – August 4, Turku, Finland. INVITED

Halford, K.J., 2005, Drawdown Estimation and Quantification of Error, EOS Trans. AGU, 86(52), Fall Meet. Suppl., Abstract H23I-05 PRESENTED

Halford, K.J., and Hanson, R.T., 2004, “Effects of simulating multi-node wells on model calibration, interpretation, and prediction results”, U.S. Geological Survey – National Ground-water Conference, June, 2004, INVITED

Halford, K.J., Laczniak, R J, and Galloway, D, 2004, Hydraulic Characterization using InSAR and Nuclear Devices, EOS, Transactions, AGU 2004 Fall Meeting, Vol. 85, No. 47, abstract H11C-0311 PRESENTED

Halford, K.J., and Hanson, R.T., 2003, Effects of simulating multi-node wells on model calibration, interpretation, and prediction results”, MODFLOW and More 2003 – International Groundwater Modeling Conference, September, 2003 INVITED

Halford, K. J., and Yobbi, D. K., 2003, Characterization of geohydrologic columns for aquifer storage and recovery: NGWA Press, AGWSE Annual Meeting and Conference Abstract Book, Orlando, FL, December 9-12, 2003, p. 25. PRESENTED

Halford, K.J. 2000, Problems Associated with Estimating the Connection Between Ground-Water Discharge and Stream-Discharge, GSA Abstracts with Programs, v. 32, no. 7., abstract 51118. PRESENTED

Halford, K.J. 2000, Ground-water recharge estimation in humid climates: Assessing the errors, USGS Western Region Technical and Management Meeting, November 13-17, 2000, Reno, Nevada. INVITED

Halford, K.J. 2000, Problems Associated with Estimating Ground-Water Discharge and Recharge from Stream-Discharge Records, EOS, Transactions, AGU 2000 Fall Meeting, Vol. 81, No. 48, abstract H61D-08 PRESENTED

Halford, K.J. 1998, Evaluating phytoremediation and recirculation wells at Orlando NTC, FL, USGS DODEC meeting, May 1998, Tampa, Florida

Halford, K.J. and J.E. Mirecki 1998, Transient expansion of a fresh-water aquifer in a reclaimed salt marsh near Mayport, Florida, EOS, Transactions, AGU 1998 Spring Meeting, abstract OS42B-10. PRESENTED

Halford, K.J. 1997, Limitations of the Rorabaugh/Daniel model for estimating recharge, Northeastern and Southeastern Regions Ground-Water Specialist Meeting, 1-28-97, Altamonte Springs, Florida

Halford, K.J. 1997, Transient expansion of a fresh-water aquifer at NAVSTA Mayport and regulatory implications, USGS DODEC meeting, May 1997, Charleston, South Carolina

Halford, K.J. 1997, Effects of steady-state assumption on hydraulic conductivity and recharge estimates in a surficial aquifer system, EOS, Transactions, AGU 1997 Spring Meeting, Vol. 78, No. 17, April 29, 1997 supplement, abstract H51C-9. PRESENTED

Halford, K.J. 1996, Effects of unsaturated zone on aquifer test analysis in a shallow-aquifer system, USGS DODEC meeting, May 1996, Colorado Springs, Colorado

Halford, K.J. 1995, Multi-aquifer testing in a surficial-aquifer system, northeast Florida, GSA abstracts with programs, Vol. 27, No. 6, Oct. 1995, abstract 25172. PRESENTED