Systech engineers strive to do the highest quality work possible, and are excited to share the results of their work with other scientists and engineers. The lists below include the publications and presentations that Systech engineers have contributed to the body of knowledge pertaining to water resources. The list has been restricted to citations for which a Systech employee is listed as either the primary or secondary author. The names of the Systech engineers are highlighted using blue text.
Journal Publications and Book Contributions
Singh, R., K. van Werkhoven, and T. Wagener. 2014. Hydrologic impacts of climate change in gauged and ungauged watersheds of the Olifants Basin – A trading space-for-time approach. Hydrological Sciences Journal 59(1):29-55.
Johnson, P.A. and S.A. Sheeder. 2013. Controlling Debris at Bridges. Stream Restoration in Dynamic Fluvial Systems, 385-397.
J.W. Herr and C.W. Chen. 2012. WARMF: Model Use, Calibration, and Validation. American Society of Agricultural and Biological Engineers. 55(4).
J.W. Herr, K. Vijayaraghavan, and E. Knipping. 2010. Comparison of Measured and MM5 Modeled Meteorology Data for Simulating Flow in a Mountain Watershed. Journal of the American Water Resources Association 46(6): 1255-1263.
Chen, C.W. and J.W. Herr. 2010. Simulating the Effect of Sulfate Addition on Methylmercury Output from a Wetland. Journal of Environmental Engineering (ASCE). 136(4): 354-362
K. Vijayaraghavan, J.W. Herr, S.Y. Chen, and E. Knipping. 2010. Linkage between an advanced air quality model and a mechanistic watershed model. Geoscientific Model Development Discussions. 3: 1503-1548.
Johnson, P.A., S.A. Sheeder and J. Newlin. 2010. Waterway transitions at U.S. bridges. Water and Environment Journal 24(4):274-281.
van Werkhoven, K., T. Wagener, P. Reed, and Y. Tang. 2009. Sensitivity-guided reduction of parametric dimensionality for multi-objective calibration of watershed models. Advances in Water Resources 32(8):1154-1169.
Wagener, T., K. van Werkhoven, P. Reed, and Y. Tang. 2009. Multiobjective sensitivity analysis to understand the information content in streamflow observations for distributed watershed modeling. Water Resources Research 45(2).
Chen, C.W., J.W. Herr, and R.A. Goldstein. 2008. Model calculations of total maximum daily loads of mercury for drainage lakes. Journal of the American Water Resources Association 44(5): 1295-1307.
van Werkhoven, K., T. Wagener, P. Reed, and Y. Tang. 2008. Rainfall characteristics define the value of streamflow observations for distributed watershed model identification. Geophysical Research Letters 35(11).
van Werkhoven, K., T. Wagener, P. Reed, and Y. Tang. 2008. Characterization of watershed model behavior across a hydroclimatic gradient. Water Resources Research 44(1).
Chen, C.W., J.W. Herr, R.A. Goldstein, G. Ice, and T. Cundy. 2005. Retrospective Comparison of Watershed Analysis Risk Management Framework and Hydrologic Simulation Program Fortran Applications to Mica Creek Watershed. Journal of Environmental Engineering 131(9):1277-1284.
Chen, C.W., J. Herr, and L. Weintraub. 2004. Decision Support System for Stakeholder Involvement. Journal of Environmental Engineering, 130(6):714-721.
Sheeder, S.A., and B.M. Evans. 2004. Development of nutrient and sediment threshold criteria for Pennsylvania TMDL assessment. Journal of the American Water Resources Association 40(4):881-888.
Evans, B.M., and S.A. Sheeder. 2003. Estimation of stream bank erosion sediment loads using linear statistical methods. Journal of Spatial Hydrology 3(1). Available at: http://www.spatialhydrology.com/journal/
Herr, J., C.W. Chen, R.A. Goldstein, R. Herd, J.M. Brown. 2003. Modeling Acid Mine Drainage on a Watershed Scale for TMDL Calculations. Journal of the American Water Resources Association 39(2):289-300.
Sheeder, S.A., J.D. Ross, and T.N. Carlson. 2002. Dual urban and rural hydrograph signals in three small Pennsylvania watersheds. Journal of the American Water Resources Association 38(4):1027-1040.
Sheeder, S.A., J.A. Lynch, and J. Grimm. 2002. Modeling atmospheric nitrogen deposition and transport in the Chesapeake Bay Watershed. Journal of Environmental Quality 31(4):1194-1206.
Chen, C.W., J. Herr, L. Ziemelis, R.A. Goldstein, and L. Olmsted. 1999. Decision Support System for Total Maximum Daily Load. Journal of Environmental Engineering 125(7):653-659.
Chen, C.W., J. Herr, L. Ziemelis, M.C. Griggs, L.L. Olmsted, and R.A. Goldstein. 1997. Consensus Module to Guide Watershed Management Decisions for Catawba River Basin. The Environmental Professional 19:75-79.
Chen, C.W., J. Herr, R.A. Goldstein, F.J. Sagona, K.E. Rylant, and G.E. Hauser. 1996. Watershed Risk Analysis Model for TVA’s Holston River Basin. Water, Air and Soil Pollution 90:65-70.
Chen, C.W., D. Leva, and A. Olivieri. 1996. Modeling the Fate of Copper Discharged to San Francisco Bay. Journal of Environmental Engineering 122(10):924-934.
Chen, C.W., W.T. Tsai, and L.E. Gomez. 1994. Modeling Responses of Ponderosa Pine to Interacting Stresses Ozone and Drought. Forest Science 40(2):267-288.
Conference Presentations
van Werkhoven, K. and S. Sheeder. 2016. WARMF: A comprehensive decision support tool to assess water quality and quantity conditions. A hands-on tutorial using examples from the Catawba River watershed. Proceedings of the NC Water Resources Research Institute Annual Conference, Raleigh, NC.
van Werkhoven, K., S. Sheeder, and J. Herr. 2015. Simulating the effects of rising temperature on a water quality impaired, multi-reservoir system in the Southeastern U.S. Proceedings of the American Water Resources Association Summer Specialty Conference on Climate Change Adaptation, New Orleans, LA.
Sheeder, S. and M. Guerin. 2014. Delta Turbidity Forecasting Using the Watershed Analysis Risk Management Framework (WARMF) and RMA11. Proceedings of the IWA Specialized Conference on Watershed and River Basin Management, San Francisco, CA.
van Werkhoven, K., J. Herr, and S. Sheeder. 2010. Expansion of WARMF to integrate watershed management strategies. Proceedings of the American Water Resources Association Annual Meeting, Philadelphia, PA.
van Werkhoven, K., S. Sheeder, J. Herr, Randall Wakumoto, and Rachel Adams. 2010. Using WARMF for water resources management and adaptation to change in island watersheds. Proceedings of the American Water Resources Association Summer Specialty Conference on Tropical Hydrology, San Juan, Puerto Rico.
Wagener, T., K. van Werkhoven, and R. Singh. 2010. Credibility of hydrologic models in the context of climate change impact studies – a case study in the Olifants Basin, South Africa. Proceedings from the European Geosciences Union Fall Meeting, Vienna, Austria.
Sheeder, S.A. and P.A. Johnson. 2008. Factors influencing debris transport and accumulation at bridges in the U.S. Mid-Atlantic states. Proceedings of the American Water Resources Association Annual Meeting, New Orleans, LA.
van Werkhoven, K., T. Wagener, P. Reed, and Y. Tang. 2008. Rainfall characteristics define the value of streamflow observations for distributed watershed model identification. Proceedings of the American Geophysical Union Fall Meeting, San Francisco, CA.
van Werkhoven, K., and T. Wagener. 2008. Reducing uncertainty in hydrologic predictions in data sparse regions: a case study in southern Africa. Proceedings of the American Meteorological Society Annual Meeting, New Orleans, LA.
van Werkhoven, K., T. Wagener, P. Reed, and Y. Tang. 2007. Characterization of watershed model behavior and sensitivity-guided optimization across a hydroclimatic gradient. Proceedings of the American Geophysical Union Fall Meeting, San Francisco, CA.
van Werkhoven, K., and T. Wagener. 2007. Reducing uncertainty in hydrologic predictions for ungauged basins in southern Africa. Proceedings of the American Water Resources Association Annual Meeting, Albuquerque, NM.
van Werkhoven, K., T. Wagener, Y. Tang, and P. Reed. 2007. Sensitivity analysis of a lumped and distributed model for uncertainty reduction and identification of dominant model controls. Proceedings of the IAHS General Assembly, Perugia, Italy.
van Werkhoven, K., T. Wagener, P. Reed, and Y. Tang. 2007. Sensitivity analysis of a distributed hydrologic model for uncertainty reduction and identification of dominant model controls. Proceedings of the SAHRA 7th Annual Meeting, Tucson, AZ.
van Werkhoven, K., T. Wagener, Y. Tang, and P. Reed. 2006. Sensitivity-guided strategy for watershed model calibration. Proceedings of the American Geophysical Union Fall Meeting, San Francisco, CA.
Goodwin, K., and T. Wagener. 2006. Tall, grande or venti? Appropriate Complexity for hydrologic models. Proceedings of the American Geophysical Union Spring Meeting, Baltimore, MD.
Herr J., C.W. Chen, R.A. Goldstein, and J. Brogdon. 2002. A Tool for Sediment TMDL Development on Oostanaula Creek. Watershed Management to Meet Emerging TMDL Environmental Regulations, Fort Worth, TX.
Sheeder, S.A. and J.A. Lynch. 2000. Modeling atmospheric nitrogen deposition and transport in the Chesapeake Bay Watershed: a GIS approach. 4th International Conference on Integrating GIS and Environmental Modeling, Banff, Alberta, Canada.
Goodwin, K., C. Rentas, K. Lansey, B. Imam, S. Sorooshian. 1998. Estimating Uncertainty in Hydrologic Predictions. Proceedings of the ASCE Water Resources Planning and Management Conference, Phoenix, AZ.
Goodwin, K., K. Lansey, B. Imam, S. Sorooshian. 1998. Effect of Remote Sensing Data on Hydrologic Model Uncertainty. Proceedings of the American Geophysical Union Spring Meeting, Boston, MA.
Goodwin, K., C. Rentas, K. Lansey, B. Imam, S. Sorooshian. 1998. Estimating Uncertainty in Hydrologic Predictions. Proceedings of the American Geophysical Union Fall Meeting, San Francisco, CA.
Sheeder, S.A. and J.W. Niemitz. 1997. Hydrogeologic variability within and between the Cockburn Town and United Estates Aquifers, San Salvador, Bahamas: Implications for future water resource management. Annual Meeting, Geologic Society of America, Salt Lake City, UT.
Technical Reports
Sheeder, S. 2015. Water Saving Technologies and Strategies for Sectors Other than Electric Power. Report prepared for Electric Power Research Institute (EPRI), Palo Alto, CA. 105 p.
Love, A., S. Sheeder, and J. Herr. 2014. Methods Used to Develop Temperature Total Maximum Daily Loads (TMDLs): Implications for the Electric Power Industry. Report prepared for Electric Power Research Institute (EPRI), Palo Alto, CA. 97 p.
Sheeder, S. and J. Herr. 2013. Calibration of the Link-Node Model for Application to Understanding Causes of Low Dissolved Oxygen Conditions in the Stockton Deep Water Ship Channel (Report 5.1.1, submitted to California Department of Fish and Game). Systech Water Resources, Inc., Walnut Creek, CA
Sheeder, S. and J. Herr. 2013. Synthesis of Methods Used in Air-Water Multiphase Pollutant TMDLs. Report prepared for Electric Power Research Institute (EPRI), Palo Alto, CA. 54 p.
Sheeder, S.A. and Johnson, P.A., 2008. Controlling Debris at Pennsylvania Bridges (No. FHWA-PA-2008-011-PSU 011).
Tzilkowski, C.J. and S.A. Sheeder. 2006. Aquatic resource assessment of Fort Necessity National Battlefield and Friendship Hill National Historic Site. Technical Report NPS/NER/NRTR-2006/065. National Park Service, Northeast Region. Philadelphia, PA
Tzilkowski, C.J. and S.A. Sheeder. 2006. Assessment of wild trout populations in Blair Gap Run, Allegheny Portage Railroad National Historic Site. Natural Resources Report NPS/NERCHAL/NRR-2006/067. National Park Service, Northeast Region. Philadelphia, PA.
Sheeder, S.A. and C.J. Tzilkowski. 2006. Level I water quality inventory and aquatic biological assessment of the Allegheny Portage Railroad National Historic Site and the Johnstown Flood National Memorial. Technical Report NPS/NER/NRTR-2006/060. National Park Service, Northeast Region. Philadelphia, PA.
Sheeder, S.A., B.M. Evans, and E. Louis. 2004. Developing statistical models to establish the relationship between urban nonpoint source pollutant loads and watershed characteristics in the Chesapeake Bay Watershed. Prepared for U.S. EPA, Chesapeake Bay Program Office, Project ID: LU-B.
Evans, B.M., S.A. Sheeder, and K.J. Corradini. 2001. AVGWLF, Version 4.03: Users Guide. Environmental Resources Research Institute, Penn State University, 73 pp.