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Permeable friction course pavement is designed with high porosity so that water can infiltrate into its pores and drain out laterally through the side. This study observes the subsurface outflow of a permeable friction course pavement via the finite element analysis program SV Flux 2D. A series of analyses were conducted for the permeable friction course pavement with different slope and rainfall intensity values. The results showed that different slope values provided different results for the subsurface outflow. As the slope increased, the subsurface outflow of the permeable friction course pavement increased. It is noticed that the effect of slope on the subsurface outflow decreased when the slope increased from 6% to 8%. In addition, this study also found that as the time of rain events increased, the subsurface outflow pavement was reduced. The investigation of the effect of rainfall intensity on the subsurface outflow of the permeable friction course pavement showed that as the rainfall intensity increased, the subsurface outflow steadily increased. However, it is noted that at the higher rainfall intensity, the pavement became saturated faster and the overflow happened earlier. In the future, further studies focused on the drainage of permeable friction course pavement including subsurface and surface outflow should be carried out.
of the hydrological impacts of imperviousness in urban catchments: A review. Journal of Environmental
Management. 2011;92(6): 1438–1448.
 Manrique-Sanchez L, Caro S. Numerical assessment of the structural contribution of porous friction
courses (PFC). Construction and Building Materials.
 Eck BJ, Winston RJ, Hunt WF, Barrett ME. Water
quality of drainage from permeable friction course.
Journal of Environmental Engineering. 2012;138(2):
 Berbee R, Rijs G, De Brouwer R, van Velzen L. Characterization and treatment of runoff from highways in
the Netherlands paved with impervious and pervious
asphalt. Water Environment Research. 1999;71(2):
 Roseen RM, Ballestero TP, Houle JJ, Avellaneda P,
Briggs J, Fowler G, Wildey R. Seasonal performance
variations for storm-water management systems in
cold climate conditions. Journal of Environmental
Engineering. 2009;135(3): 128–137.
 Eisenberg B, Lindow KC, Smith DR. (eds.) Permeable pavements. Reston, VA, USA: American Society
of Civil Engineers; 2015.
 Tan SA, Fwa TF, Chai KC. Drainage considerations
for porous asphalt surface course design. Transportation Research Record. 2004;1868(1): 142–149.
 Zhang Q, Ji T, Wang Z, Xiao L. Experimental study
and calculation of a three-dimensional finite element
model of infiltration in drainage asphalt pavement.
Materials. 2020;13(18): 3909.
 Chen X, Wang H, Li C, Zhang W, Xu G. Computational investigation on surface water distribution and
permeability of porous asphalt pavement. International Journal of Pavement Engineering. 2022;23(4):
 Ranieri V. Runoff control in porous pavements. Transportation Research Record. 2002;1789(1): 46–55.
 Kovács G. Seepage hydraulics. Elsevier; 2011.
 Thode R, Gitirana G. Theory manual of saturated/unsaturated finite element. 2D/3D seepage modeling.
Saskatoon: SVFlux, SoilVision Systems Ltd; 2014.
 AASHTO. A policy on geometric design of highways
and streets. Washington, DC: American Association
of State Highway Transportation Officials; 2001.
 Antunes LN, Thives LP, Ghisi E. Potential for potable
water savings in buildings by using stormwater harvested from porous pavements. Water. 2016;8(4): 110.
 Yoo J, Nguyen TH, Lee E, Lee Y, Ahn J. Measurement of permeability in horizontal direction of opengraded friction course with rutting. Sustainability.
 Van Genuchten MT. A closed-form equation for
predicting the hydraulic conductivity of unsaturated
soils. Soil Science Society of America Journal.
 Fredlund MD. User’s manual for SVFlux, saturatedunsaturated numerical modeling. Saskatoon, Canada:
SoilVision Systems; 2010.
 Lim BK, Kim YT. Personal Communication; 2012.
 Fredlund DG, Xing A. Equations for the soil-water
characteristic curve. Canadian Geotechnical Journal.
 GCTS. FGCTS Testing system. https://www.gcts.com/
[Accessed 3rd Nov 2023].
 Nguyen TH, Ahn J. Numerical study on the
hydrologic characteristic of permeable friction
course pavement. Water. 2021;13(6): 843.
 Ji Y, Xie J, Liu M. Double layer drainage performance
of porous asphalt pavement. In: International conference on Civil, Mechanical, and Material Engineering:
ICCMME 2018, 16-18 March 2018, Jeju-do, Korea.
New York, United States: AIP Publishing; 2018.