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Department of Civil
and Environmental Engineering
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Peggy A. Johnson
Professor and Head
Water Resources Engineering


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Research

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Publications


Bio
Books and Chapters
  1. Johnson, P.A., 1999.  Scour at Wide Piers Relative to Flow Depth.  in Stability and Scour at Highway Bridges, Richardson and Lagasse (eds.), ASCE Press.  Invited Paper.
  2. Simon, A., and Johnson, P.A., 1999.  Relative Roles of Channel-Adjustment Processes and Scour on the Reliability of Bridge Foundations.  in Stability and Scour at Highway Bridges, Richardson and Lagasse (eds.), ASCE Press.  Invited Paper.
  3. Brown, E.R., and Johnson, P.A., 1999.  Maryland’s Guidelines to Waterway Construction.  Maryland Department of the Environment, Baltimore, Maryland.
  4. Johnson, P.A., and Rinaldi, M., 1998.  Uncertainty in Stream Channel Restoration.  in Uncertainty Modeling and Analysis in Civil Engineering, B.M. Ayyub (ed.), CRC Press, New York, Chapter 22.
  5. Johnson, P.A., and McCuen, R.H., 1996.  Mud and Debris Flows.  in Hydrology of Disasters, V.P. Singh (ed.), Chapter 8.
  6. Johnson, P.A., and Ayyub, B.M., 1995.  Chapter 26 - Applications in Bridges.  in Probabilistic Structural Mechanics Handbook.  Van Nostrand Reinhold, New York, NY.
  7. Johnson, P.A., 1994.  Quantification of Bridge Pier Scour Uncertainty.  in Uncertainty Modeling and Analysis: Theory and Applications, ed. Ayyub and Gupta.  North-Holland, Chapter 25, 407-420.
  8. McCuen, R.H., Johnson, P.A., and Davis, C., 1993. Dynamic Communication for Engineers, ASCE, 176 pp.
 
Articles in Refereed Journals
  1. Johnson, P.A., and Sheeder, S.A., 2010. Controlling debris at bridges. In Stream Restoration in Dynamic Fluvial Systems: Scientific Approaches, Analyses, and Tools, A. Simon (ed.), AGU Press (in press).
  2. Newlin, J.T., Johnson, P.A., and Miller, A.C., 2009. Characterization of sediment transport at bridge sites in the Northern Tier, PA. Journal of Hydraulic Engineering (in press).
  3. Johnson, P.A., Sheeder, S.A., Newlin, J.T., 2009. Waterway transitions at bridges. Water and Environment Journal. (in press; available in advance of print at http://www3.interscience.wiley.com/journal/122381651/abstract).
  4. Newlin, J.T., Johnson, P.A., 2009. Adaptive management case study: stream channel mitigation methods at bridge crossings in the northern tier region, PA., Journal of the American Water Resources Association, 45(5), 1197–1208.
  5. Johnson. P.A., and Fecko,  B.J.  Summary of regional channel geometry equations for physiographic regions in the eastern US.  River Research and Applications, 23, 1-12.
  6. Xing, S., Burnett, E., and Johnson, P.A., 2007.  Uncertainty analysis of vapor pressure measurement. Journal of Building Physics, Vol. 30 (4), 317-336.
  7. Niezgoda, S.L., and Johnson, P.A. 2007. Case Study in Cost-Based Risk Assessment for Selecting a Stream Restoration Design Method for a Channel Relocation Project.  Journal of Hydraulic Engineering, Vol. 133 (5), 468-481.
  8. Johnson, P.A., 2006.  Physiographic characteristics of bridge-stream intersections.  River Research and Applications, 22(2006), 617-630.
  9. Niezgoda, S.L., and Johnson, P.A., 2006.  Modeling the long-term impacts of using rigid structures in stream channel restoration.  Journal of the American Water Resources Association, 42(6), 1597-1614.
  10. Niezgoda, S.L., and Johnson, P.A., 2005.  Improving the urban stream restoration effort: identifying critical form and processes relationships.  Environmental Management, 35(5), 579-592.
  11. Johnson, P.A., 2005.  Preliminary assessment and rating of stream channel stability.  Journal of Hydraulic Engineering, 131(10), 845-852.
  12. Choi, B.S., Scanlon, A., and Johnson, P.A., 2004.  Monte Carlo Simulation of Immediate and Time-Dependent Deflections of Reinforced Concrete Beams and Slabs.  ACI Structural Journal, 101(5).         
  13. Johnson, P.A., and Niezgoda, S.L., 2003. Risk-based method for selecting scour countermeasures.  ASCE Journal of Hydraulic Engineering, 130(2), 121-128.
  14. Johnson, P.A., Hey, R.D., Brown, E.R., and, Rosgen, D.L. 2002.  Stream restoration in the vicinity of bridges.  Journal of the American Water Resources Association, 38(1), 55-67.
  15. Johnson, P.A., Tereska, R.L., and Brown, E.R., 2002. Using technical adaptive management to improve design guidelines for urban in-stream structures.  Journal of the American Water Resources Association, 38(4), 1143-1152.
  16. Johnson, P.A., 2002.  Incorporating road crossings in stream restoration projects.  Ecological Restoration, 20(4), 270-277.
  17. Johnson, P.A., Hey, R.D., Horst, M.W., and Hess, A.J., 2001.  Aggradation at bridges.  Journal of Hydraulic Engineering, ASCE, 127(2), 154-158.
  18. Hess, A. J., and Johnson, P.A., 2001. A systematic analysis of the constraints to urban stream enhancements. Journal of the American Water Resources Association, 37(1), 213-222.
  19. Johnson, P.A., Tessier, M. Hey, R.D., and Rosgen, D.L., 2001.  The use of vanes for local abutment scour reduction.  Journal of Hydraulic Engineering, ASCE, 127(9), 772-779.
  20. Johnson, P.A., and Brown, E.R., 2001.  Incorporating uncertainty in the design of stream channel modifications. Journal of the American Water Resources Association, 37(5), 1225-1236.
  21. Johnson, P.A., and Brown, E.R., 2000. Stream assessment for multi-cell culvert use.  Journal of Hydraulic Engineering, ASCE, 126(5), 381-386.                           
  22. Johnson, P.A., 1999.  Fault tree analysis of bridge failure due to scour and channel instability.   Journal of Infrastructure Systems, ASCE Journal of Infrastructure Systems, 5(1), 35-41.
  23. Tokar, A.S., and Johnson, P.A., 1999. Rainfall-runoff modeling using artificial neural networks. Journal of Hydrologic Engineering, ASCE, 4(3), 232-239.
  24. Johnson, P.A., Gleason, G., and Hey, R.D., 1999.  Rapid assessment of channel stability in the vicinity of a road crossing.  Journal of Hydraulic Engineering, ASCE, 125(6), 645-652.
  25. Johnson, P.A., and Dock, D.A., 1998.  Probabilistic bridge scour estimates.  Journal of Hydraulic Engineering, ASCE, 124(7), 750-755.
  26. Johnson, P.A., 1998.  Problem based, cooperative learning in the engineering classroom.  Journal of Professional Issues in Practice and Education, ASCE, 125(1), 8-11.
  27. Rinaldi, M., and Johnson, P.A., 1997.  Characterization of stream meanders for stream restoration.  Journal of Hydraulic Engineering, ASCE, 123(6), 567-570.
  28. Johnson, P.A., and Simon, A., 1997.  Reliability of bridge foundations in modified channels.  Journal of Hydraulic Engineering, ASCE, 123(7), 648-651.
  29. Ports, M.A., Johnson, P.A., Shea, C. and Rahmani, A., 1997.  On scour’s frontier.  Civil Engineering, ASCE, 67(8), 60-62.
  30. Rinaldi, M., and Johnson, P.A., 1997.  Stream meander restoration.  Journal of the American Water Resources Association, 33(4), 867-878.
  31. Johnson, P.A., and Ayyub, B.M., 1996.  Modeling uncertainty in pier scour estimates.  Journal of Hydraulic Engineering, ASCE,122(2), 66-72.
  32. Johnson, P.A., 1996.  Uncertainty of hydraulic parameters.  Journal of Hydraulic Engineering, ASCE, 122(2), 112-115.
  33. Johnson, P.A., and others, 1996. (Task Committee on Hydraulic Engineering Research Advocacy.)  Environmental hydraulics: new research directions for the 21st century.  Journal of Hydraulic Engineering, ASCE 122(4), 180-183.
  34. Poff, N.L., Tokar, A.S., and Johnson, P.A., 1996. Stream hydrological and ecological responses to climate change assessed with an artificial neural network.  Limnology and Oceanography, 41(5), 857-863.
  35. Johnson, P.A., and Heil, T.M., 1996.  Bridge scour - a probabilistic approach.  Infrastructure, 1(4), 24-30.
  36. Johnson, P.A., and Heil, T.M., 1996.  Uncertainty in estimating bankfull conditions.  Water Resources Bulletin, 32(6), 1283-1292.
  37. Johnson, P.A., 1995.  Comparison of pier scour equations using field data.  Journal of Hydraulic Engineering, ASCE, 121(8), 626-629.
  38. Johnson, P.A., and Curtis, P.D., 1994.  Water balance of the Blue Nile river basin.  Journal of Irrigation and Drainage, ASCE, 120(3), 573-590.
  39. Johnson, P.A., and Torrico, E.F., 1994.  Scour around wide piers in shallow water.  Transportation Research Board.  Transportation Research Record 1471, 66-70.
  40. McCuen, R.H., Johnson, P.A., and Hromadka, T.V., 1993.  Regionalized partial-duration balanced-hydrograph. Journal of Irrigation and Drainage Engineering, ASCE, 119(6), 1036-1051.
  41. Johnson, P.A. and Ayyub, B.M., 1992. Assessment of time-variant bridge reliability due to pier scour. Journal of Hydraulic Engineering, ASCE, 118(6), 887-903.
  42. Johnson, P.A., 1992. Reliability-based pier scour engineering. Journal of Hydraulic Engineering, ASCE, 118(10), 1344-1358.
  43. Johnson, P.A., and McCuen, R.H., 1992.  Effect of debris flows on debris basin design.  Invited paper, Critical Reviews in Environmental Control, 22(1/2), 137-149.
  44. Johnson, P.A., and Jones, J.S., 1992. Shear stress at the base of a pier. Transportation Research Board, Transportation Research Record 1350, 14-18.
  45. Johnson, P.A., and Jones, J.S., 1992.  Merging laboratory and field data in bridge scour engineering.  Journal of Hydraulic Engineering, ASCE, 119(10), 1176-1181.
  46. Johnson, P.A., Leasure, J.D., and Llinas, E., 1992. Future resources for engineering. Journal of Professional Issues, ASCE, 118(1), 30-37.
  47. Johnson, P.A., 1991. Advancing bridge pier scour engineering. Journal of Professional Issues, ASCE, 117(1), 48-55.
  48. Johnson, P.A., McCuen, R.H., and Hromadka, T.V., 1991. Magnitude and frequency of debris flows. Journal of Hydrology, 123(1-2), 69-82.
  49. Johnson, P.A., McCuen, R.H., and Hromadka, T.V., 1991. Debris basin policy and design. Journal of Hydrology, 123(1-2), 83-95.
  50. Johnson, P.A. and McCuen, R.H., 1991. A temporal, spatial pier scour model. Transportation Research Board Record, No. 1319.
  51. Johnson, P.A. and McCuen, R.H., 1989.  Slit dam design for debris flow mitigation.  Journal of Hydraulic Engineering, ASCE, 115(9), 1293 - 1296.
  52. McCuen, R.H., Leahy, R.B., and Johnson, P.A., 1989. Problems  with logarithmic transformations in regression. Journal of Hydraulic Engineering, ASCE, 116(3), 414 - 428.
 
Unrefereed Conference Proceedings
  1. Johnson, P.A., and Whittington, R.M., 2010. Assessing bridge vulnerability and risk due to stream instability. 5th International Conference on Scour and Erosion, San Francisco, Nov. 7-10, 2010

  2. Johnson, P.A., 2010. Risk-based framework for stream repair projects. ICVRAM (International Conference on Vulnerability and Risk Analysis and Management) and ISUMA (International Symposium on Uncertainty Modeling and Analysis) conference, College Park, Maryland, April 11-13, 2011.

  3. Johnson, P.A., Newlin, J.T., and Sheeder, S., 2008. Creating stable waterway transitions at bridges. AWRA Annual Water Resources Conference, November 17-20, 2008, New Orleans, LA
  4. Sheeder, S. and Johnson, P.A., 2008. Effect of state policies on the success of stream restoration. AWRA Annual Water Resources Conference, November 17-20, 2008, New Orleans, LA.
  5. Newlin, J.T. and Johnson, P.A., 2008. Sediment Transport Characterization for Bridge Crossing Design or Maintenance. AWRA Annual Water Resources Conference, November 17-20, 2008, New Orleans, LA.
  6. Johnson, P.A., 2008. Uncertainty in the use of in-stream structures in restoration and stream modification projects. Southeast Regional Stream Restoration, Asheville, NC, November 3-6.
  7. Korkmaz, A., and Johnson, P.A., 2007.  Evaluation of fragility analyses for probabilistic seismic.  First International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Rethymnon, Crete, June 13-16, 2007.
  8. Korkmaz, A., and Johnson, P.A., 2007.  Probabilistic seismic structural assessment.  ASCE Structures Conference, Long Beach, CA.  May 16-19.
  9. Niezgoda, S.L., and Johnson, P.A., 2007. Applying cost-based risk assessment to stream restoration design.  Proceedings of the ASCE-EWRI Conference, Tampa, Florida.
  10. Malhotra, R., and Johnson, P.A., 2007. Uncertainties in stream restoration for highway design and improvement.  Proceedings of the ASCE-EWRI Conference, Tampa, Florida.
  11. Johnson, P.A., 2006.  Assessing stream channel stability at bridges.  FHWA National Hydraulics Conference, San Diego, CA.
  12. Fecko, B.J., and Johnson, P.A., 2006.  Statistical analyses of regional curves for stream restoration design.  7th International Conference on Hydroscience and Engineering (ICHE-2006), Philadelphia, September 10 to 13, 2006.
  13. Johnson, P.A., 2005.  Physiographic implications of stream stability at bridges.  ASCE Watershed Management Conference, Williamsburg, VA.
  14. Johnson, P.A., 2005.  Accommodating learning styles in engineering exams.  ASEE Mid-Atlantic Section Spring 2005 Conference, Teaneck, NJ April 15-16, 2005.
  15. Johnson, P.A., 2005.  Treating Channel Instability at Bridges.  New York City Bridge Conference, New York, New York, Sept. 12-13.          
  16. Goshn, M., Johnson, P.A., and Wang, J., 2004.  Reliability of Bridge Piers under Local Live-Bed Scour.  Proceedings of the Int’l Assoc. of Bridge Management and Safety (IABMAS), Kyoto, Japan.
  17. Niezgoda, S.L., and Johnson, P.A., 2004.  Restoring form and processes in urban streams: the state of the art.  Proceedings of the ASCE-EWRI Conference, Salt Lake City, Utah.
  18. Elefteriadou, L., P. Johnson, N. Gautam, J. Yeon, R. Malhotra, D. Jayabalan (2004).  Use of Traffic Management Center (TMC) and Sensor Data from Philadelphia to Develop Travel Time Route Reliability Models.  North American Travel Monitoring Exposition and Conference), San Diego, CA, June  27-30, 2004
  19. Elefteriadou, L., P. Johnson, N. Gautam, J. Yeon, R. Malhotra, D. Jayabalan (2004).  Travel time route reliability.  TRANSTEC, Athens, Greece, Sept 1-5, 2004.
  20. Johnson, P.A., 2004.  Assessment and Rating of Stream Channel Stability Near Bridges.  Federal Highway Administration National Hydraulic Engineering Conference, Asheville, NC, Sept. 1-3.
  21. Johnson, P.A., 2004.  Stream stability at bridges.  3rd International Conference on Natural Channel Design, Ottawa, Canada, Sept 27-30.
  22. Johnson, P.A., 2004.  The Effect of Extreme Events on Bridge Scour.  Proceedings of the Int’l Assoc. of Bridge Management and Safety (IABMAS), Kyoto, Japan.
  23. Johnson, P.A., 2003. The Effect of Extreme Events on Bridge Scour.  Proceedings of the Structural Engineering Conference, Seattle, Washington.
  24. Johnson, P.A., Davis, C.R, and Miller, A.C., 2003.  Selection of Erosion Control Measures for Highway Construction, Proceedings of the EWRI conference, Philadelphia, June 23-26.
  25. Ghosn, M., Mylonakis, G., Johnson, P., Wang, J., 2002.  Effect of scour on seismic safety of bridge piers.  National Conference on Earthquake Engineering, Boston, 2002.
  26. Johnson, P.A., 2002.  Channel instability at bridges.  First International Conference on Scour of Foundations, College Station, Texas, November 17-20.
  27. Kaufman, R.L., and Johnson, P.A., 2001.  Adaptive improvements to design guidelines for stream restoration structures.  Proceedings of the Wetlands and Stream Restoration Conference, ASCE, Reno, Nevada.
  28. Gohsn, M., and Johnson, P.A., 2000. Reliability analysis of bridges under the combined effect of scour and earthquakes.  Proceedings of the Eighth ASCE Joint Specialty Conference on Probabilistic Mechanics and Structural Reliability, University of Notre Dame, July 24-26.
  29. Johnson, P.A., 1999.  Designing bridges for combined extreme events.  Proceedings of the ASCE International Water Resources Engineering Conference, Seattle, WA.
  30. Smith, S., Bereciatua, P., Johnson, P., and Haltiner, J., 1999.  Channel design and the forgotten floodplain.  Proceedings of the ASCE International Water Resources Engineering Conference, Seattle, WA.
  31. Johnson, P.A., 1999.  Bankfull, effective, and dominant discharges.  Proceedings of the Stream Restoration and Protection Workshop, NC Stream Restoration Institute, Asheville, NC.
  32. Johnson, P.A., 1999.  Comparison of traditional engineering approaches to natural channel design.  Proceedings of the Stream Restoration and Protection Workshop, NC Stream Restoration Institute, Asheville, NC.
  33. Niezgoda, S.L., and Johnson, P.A., 1999.  Abutment scour at small, severely contracted bridges.  Proceedings of the ASCE International Cold Regions Conference, Lincoln, New Hampshire.
  34. Johnson, P.A., and Rinaldi, M., 1997.  Uncertainty in the design of stream channel restorations.  Proceedings of the XXVII IAHR Congress, ASCE, San Francisco, California.
  35. Smith, S.P., Annandale, G.W., Johnson, P.A., Jones, J.S., and Umbrell, E.R., 1997.  Pier scour in resistant material: current research on erosive power.  Proceedings of the XXVII IHHR Congress, ASCE, San Francisco, California.
  36. Johnson, P.A., and Hey, R.D., 1998.  Restoration of stream meanders.  Proceedings of the Wetlands and Stream Restoration Conference, ASCE, Denver, CO.
  37. Johnson, P.A., 1998.  Fault tree analysis of bridge scour.  Proceedings of the ASCE International Water Resources Engineering Conference, Memphis, TN.
  38. Brown, E., and Johnson, P.A., 1998.  The need for clearly stated objectives in stream restoration. Proceedings of the ASCE International Water Resources Engineering Conference, Memphis, TN.
  39. Heil, T., and Johnson, P.A., 1996.  Assessment and implications of local channel instability on the prediction of bridge scour.  Proceedings of the North American Water and Environment Congress '96, ASCE, Anaheim, California.
  40. Johnson, P.A., 1996.  Pier scour at wide piers.  Proceedings of the North American Water and Environment Congress '96, ASCE, Anaheim, California.
  41. Johnson, P.A., 1996.  Uncertainty in estimations of excess shear stress.  Proceedings of the seventh IAHR Internaional Symposium, Mackay, Australia.    
  42. Johnson, P.A., and Simon, A., 1995.  Reliability of Bridge Foundations in Unstable Alluvial Channels.  Proceedings of 1995 Specialty Conference on Hydraulic Engineering, ASCE, San Antonio, Texas.
  43. Agazi, K., Johnson, P.A., and Heil, T.M., 1995.  Uncertainties associated with restoring natural alignment to previously straightened streams.  Proceedings of ISUMA '95, The Third International Symposium on Uncertainty Modeling and Analysis, University of Maryland, September 17-20, 1995.
  44. Heil, T., and Johnson, P.A., 1995.  Uncertainty of bankfull discharge estimations.  Proceedings of ISUMA '95, The Third International Symposium on Uncertainty Modeling and Analysis, University of Maryland, September 17-20, 1995.
  45. Poff, N.L., Johnson, P.A., and Tokar, A.S., 1994.  Assessing Hydrological responses of streams to climate change using a neural net model.  Symposium on Regional Assessment of Freshwater Ecosystems and Climate Change in North America, Oct. 24-26, Leesburg, VA.
  46. Johnson, P.A., and Ayyub, B.M., 1993.  Incorporating uncertainty into bridge pier estimations.  Proceedings of ISUMA '93, The Second International Symposium on Uncertainty Modeling and Analysis, University of Maryland, April 25-28, 1993, 136-140.
  47. Johnson, P.A., and Ayyub, B.M., 1993.  Incorporating uncertainty into bridge scour estimates.  Proceedings of 1993 Specialty Conference on Hydraulic Engineering, ASCE, San Francisco, California.
  48. Jones, J.S., and Johnson, P.A., 1992.  Merging field and laboratory bridge scour data.  Proc. of Water Forum 1992, ASCE, Baltimore, Maryland.
  49. Johnson, P.A., and Ayyub, B.M., 1992.  Probability of bridge failure due to pier scour.  Proc. of the Water Resources Sessions at Water Forum 1992, ASCE, Baltimore, Maryland, 690-695.
  50. Johnson, P.A., McCuen, R.H., and Hromadka, T.V., 1989, Design of basins for debris flow mitigation.  Proc. 16th Water Resources Planning and Management Division Annual Specialty Conference, ASCE, Sacramento, California, 263 - 266.
 
Monographs and Reports
  1. Sheeder, S.A., and Johnson, P.A., 2008. Controlling Debris at PA Bridges, Final Report, PennDOT, Harrisburg, PA
  2. Sheeder, S.A., and Johnson, P.A., 2008. Controlling Debris at PA Bridges, Literature Review. PennDOT, Harrisburg, PA
  3. Newlin, J.T., Johnson, P.A., and Miller, A.C., 2007. Waterway Structures in the Northern Tier, Final Report, PennDOT, Harrisburg, PA
  4. Johnson, P.A., and Malhotra, R., 2006.  Travel Time Route Reliability.  Final Report to NSF.
  5. Johnson, P.A., Wittmer, H., and Shopf, J., 2006.  The State of Enrollment for Women in the Undergraduate CEE Program at Penn State University.  Final report to the Associate Dean of Engineering.
  6. Hiltunen, D.R., Johnson, P.A., Laman, J.A., Linzell, D.G., Miller, A.C., Niezgoda, S.L., Scanlon, A., Schokker, A.J., and Tikalsky, P.J., 2005.  Interstate 99 Research.  Final report to the Pennsylvania Department of Transportation, Contract No. SPC 020S78.
  7. Johnson, P.A., Niezgoda, S.L., Newlin, J., 2005.  Dimple Rock Study on the Youghiogheny River near Ohiopyle.  Pennsylvania Department of Conservation and Natural Resources.
  8. Johnson, P.A, 2004.  A Method for Assessing Stream Channel Stability at Bridges in Physiographic Regions Across the United States.  Final Report to FHWA, Washington, D.C. (On line at http://www.fhwa.dot.gov/engineering/hydraulics/pubs/05072/index.cfm)
  9. Johnson, P.A., 2003.  Standards and Design Guidelines for Instream Structures and Bioengineering Practices. Final Report to the Maryland Department of the Environment, Baltimore, Maryland.
  10. Johnson, P.A., and Miller, A.C., 2003.  Waterway Structures in the Northern Tier:  A Literature Review on Causes and Solutions for Aggradation at Bridges.  PennDOT, Harrisburg, PA.
  11. Johnson, P.A., Davis, C.R., and Miller, A.C., 2002.  Best Management Practices for Control of Sediment and Erosion at Highway Projects.  PennDOT, Harrisburg, PA.
  12. Johnson, P.A., and Cherry, H., 2001.  Restoration of Great Meadow Run at Fort Necessity.  National Park Service, Uniontown, PA.
  13. Johnson, P.A., Tessier, M. Hey, R.D., Rosgen, D. 2000.  Hydraulic Control of Local Scour at Bridges.  Maryland State Highway Administration, Baltimore, Maryland.
  14. Cole, C.A., and Johnson, P.A., 1998.  Nine Mile Run Stability and Wetland Assessment.  Report to the Studio for Creative Inquiry, Carnegie-Mellon University.
  15. Ayyub, B.M., Johnson, P.A., and Baecher, G., 1997.  Guidelines for Risk-Based Assessment of Dam Safety.  U.S. Army Corps of Engineers
  16. Johnson, P.A., and Brown, E.R., 1997.  Standards and Design Guidelines for Instream Structures and Bioengineering Practices: A Literature Review.  Maryland Department of the Environment, Baltimore, Maryland.
  17. McCuen, R.H., Johnson, P.A., and Ragan, R.M., 1996.  Highway Hydrology, Hydraulic Design Series No. 2, second edition (HDS-2).  Federal Highway Administration, Washington, D.C.
  18. Heil, T.M.  and Johnson P.A., 1996.  Wilde Lake Stream Evaluation and Sediment Study, Howard County, Maryland.  Howard County Department of Public Works, Howard County Maryland.
  19. Heil, T.M.  and Johnson P.A., 1996.  Stability of Stream at Lake Placid Court.  Howard County Department of Public Works, Howard County, Maryland.
  20. Tokar, A.S., and Johnson, P.A., 1993. Calibration of Model Parameter a for the Blue Nile.  NILE0120, National Weather Service, Silver Spring, MD.
  21. Johnson, P.A., and Curtis, P.D., 1992. Monthly Water Balance, NILE0116, National Weather Service, Silver Spring, MD.
  22. Tokar, A.S., and Johnson, P.A., 1992. Blue Nile Watershed Characteristics.  NILE0117, National Weather Service, Silver Spring, MD.
  23. Tokar, A.S., and Johnson, P.A., 1992. Optimization of Channel Cross-section Parameters for Blue Nile.  NILE0118, National Weather Service, Silver Spring, MD.