It is generally perceived that a major problem with permeable interlocking concrete pavements
(PICP) is clogging. Closely related to this is the fact that permeable pavements can retain up to
90% of solids suspended in the water infiltrating the pavements [Pezzaniti et al., 2009]. However,
experience in Europe shows reductions in PICP permeability due to clogging reach a near equilibrium
condition between 5 and 10 years after construction [Dierkes et al., 2002; Borgwardt, 2006] as
pollutants are retained in the pavement. This needs to be considered in the design of PICP [Pezza-niti and Shackel, 2009] and, for this reason, it is essential to quantify changes in the infiltration capacity
of PICP over time.