Dr. Robert Ryan is an Associate Professor of Instruction in the Department of Civil and Environmental Engineering at Temple University and a licensed professional engineer in the Commonwealth of Pennsylvania. His research interests are focused on urban stream hydrology and hydraulics with a special interest in hyporheic exchange, riparian corridor/stream channel interactions and stormwater management. Dr Ryan's research has been published in highly regarded peer-reviewed journals.

Research Interests

  • Urban Stream Hydrology & Stormwater Management

Courses Taught




CMT 3351

Applied Hydraulics


ENVT 0845

The Environment


CEE 3711

Environmental Engineering


CEE 4631

Environmental Hydrology


CEE 4641

Urban Streams and Stormwater Management


CEE 4711

Air Pollution Control System


CEE 5631

Environmental Hydrology


CEE 5641

Urban Streams and Stormwater Management


ENGR 4169

Engineering Seminar


Selected Publications

  • Behbahani, A., Ryan, R.J., & McKenzie, E.R. (2021). Impacts of salinity on the dynamics of fine particles and their associated metals during stormwater management. Science of the Total Environment, 777. doi: 10.1016/j.scitotenv.2021.146135

  • Beganskas, S., Ryan, R.J., Walters, E., Soro, M., Cushman, E., & Toran, L. (2021). Coupling PCSWMM and WASP to Evaluate Green Stormwater Infrastructure Impacts to Storm Sediment Loads in an Urban Watershed. Journal of the American Water Resources Association, 57(1), pp. 134-153. doi: 10.1111/1752-1688.12896

  • Flynn, M. & Ryan, R.J. (2021). Assessment of SMP performance under future climate change. World Environmental and Water Resources Congress 2021: Planning a Resilient Future Along America's Freshwaters - Selected Papers from the World Environmental and Water Resources Congress 2021, pp. 302-313. doi: 10.1061/9780784483466.029

  • Behbahani, A., Ryan, R.J., & McKenzie, E.R. (2020). Long-term simulation of potentially toxic elements (PTEs) accumulation and breakthrough in infiltration-based stormwater management practices (SMPs). J Contam Hydrol, 234, p. 103685. Netherlands. doi: 10.1016/j.jconhyd.2020.103685

  • Toran, L., Nyquist, J.E., Fang, A.C., Ryan, R.J., & Rosenberry, D.O. (2013). Observing lingering hyporheic storage using electrical resistivity: Variations around stream restoration structures, Crabby Creek, PA. Hydrological Processes, 27(10), pp. 1411-1425. doi: 10.1002/hyp.9269

  • Toran, L., Hughes, B., Nyquist, J., & Ryan, R. (2013). Freeze core sampling to validate time-lapse resistivity monitoring of the hyporheic zone. Ground Water, 51(4), pp. 635-640. United States. doi: 10.1111/j.1745-6584.2012.01002.x

  • Toran, L., Hughes, B., Nyquist, J., & Ryan, R. (2012). Using hydrogeophysics to monitor change in hyporheic flow around stream restoration structures. Environmental and Engineering Geoscience, 18(1), pp. 83-97. doi: 10.2113/gseegeosci.18.1.83

  • Ryan, R.J., Larson, P.C., & Welty, C. (2011). The logistics and mechanics of conducting tracer injection experiments in urban streams. Urban Ecosystems, 14(1), pp. 87-117. doi: 10.1007/s11252-010-0144-5

  • Ryan, R.J., Welty, C., & Larson, P.C. (2010). Variation in surface water-groundwater exchange with land use in an urban stream. Journal of Hydrology, 392(1-2), pp. 1-11. doi: 10.1016/j.jhydrol.2010.06.004

  • Nyquist, J.E., Toran, L., Fang, A.C., Ryan, R.J., & Rosenberry, D.O. (2010). Tracking tracer breakthrough in the hyporheic zone using time-lapse DC resistivity, Crabby Creek, Pennsylvania. Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP, 2, pp. 923-929. doi: 10.4133/1.3445534

  • Ryan, R.J. & Boufadel, M.C. (2007). Lateral and longitudinal variation of hyporheic exchange in a piedmont stream pool. Environ Sci Technol, 41(12), pp. 4221-4226. United States. doi: 10.1021/es061603z

  • Ryan, R.J., Packman, A.I., & Kilham, S.S. (2007). Relating phosphorus uptake to changes in transient storage and streambed sediment characteristics in headwater tributaries of Valley Creek, an urbanizing watershed. Journal of Hydrology, 336(3-4), pp. 444-457. doi: 10.1016/j.jhydrol.2007.01.021

  • Ryan, R.J. & Boufadel, M.C. (2007). Evaluation of streambed hydraulic conductivity heterogeneity in an urban watershed. Stochastic Environmental Research and Risk Assessment, 21(4), pp. 309-316. doi: 10.1007/s00477-006-0066-1

  • Ryan, R.J. & Boufadel, M.C. (2006). Influence of streambed hydraulic conductivity on solute exchange with the hyporheic zone. Environmental Geology, 51(2), pp. 203-210. doi: 10.1007/s00254-006-0319-9

  • Ryan, R.J. & Boufadel, M.C. (2006). Incomplete mixing in a small, urban stream. J Environ Manage, 81(1), pp. 50-57. England. doi: 10.1016/j.jenvman.2005.09.016

  • Ryan, R.J. & Packman, A.I. (2006). Changes in streambed sediment characteristics and solute transport in the headwaters of Valley Creek, an urbanizing watershed. Journal of Hydrology, 323(1-4), pp. 74-91. doi: 10.1016/j.jhydrol.2005.06.042

  • Ryan, R.J., Packman, A.I., & Welty, C. (2004). Estimation of solute transport and storage parameters in a stream with anthropogenically produced unsteady flow and industrial bromide input. Water Resources Research, 40(1). doi: 10.1029/2003WR002458