Coupled infiltration and filtration behaviours of concrete porous pavement for stormwater management

Abstract

Cementitious porous pavement (CPP) is a structural low‐impact development material for rainfall–runoff management. Both infiltration and filtration are critical functions for CPP stormwater quality and quantity control. In this study, three groups of CPP specimens exposed to rainfall–runoff for 4 years and experienced with different maintenance intervals (6, 12 and 48 months, respectively) were used to examine CPP infiltration and filtration performance. Particle mass strained on CPP surface, saturated infiltration rate If, temporal infiltration rate I(t), suspended sediment concentration (SSC) and turbidity (τ) were measured to evaluate the process of filtration/infiltration. I(t), SSC and τ were examined less than 50 mg/l of the suspended particle loading. It was found that the CPP surface cleaning methods used in the past 4 years, namely, high pressure wash followed by vacuuming with one atmosphere (100 kPa), were effective, and a 12‐month maintenance interval was verified suitable to maintain the pore structure an acceptable infiltration rate for stormwater management. It was also found that CPP infiltration and filtration process affect each other, and the two properties are coupled in urban stormwater quality and quantity control. On the basis of the experimental measurements, the temporal infiltration rate of the cleaned CPP under a certain particle loading could be simulated by a first‐order nonlinear rational model, and effluent turbidity–SSC relationship was found following a power law. Copyright © 2012 John Wiley & Sons, Ltd.

Hydrological Impacts of Urbanization and Urban Roof Water Harvesting in Water-limited Catchments: A Review

“…Urbanization may reduce the complexity and heterogeneity by altering catchment characteristics through clearing vegetation, increasing the proportion and connectivity of impervious surfaces and altering the natural topography such as slope steepness, orientation and length. The degree of imperviousness in the built environment is related to the ecohydrological impacts of urbanization (Kuang and Fu 2013). The high proportion of impervious surfaces and the associated changes in slope steepness and orientation substantially increase the runoff coefficients of urbanized catchments compared to natural systems.…”

“…In rainfall-runoff analysis and modelling, the runoff coefficient indicates impact of land use on infiltration. Runoff coefficients for impervious pavements, roads and roofs range from 0.8 to 0.95 (Kuang and Fu 2013), indicating low infiltration rate and hence high runoff generation.…”

“…Rainfall amount and intensity, and surface conditions control infiltration (Kuang and Fu 2013). Therefore, urban-induced high-intensity storms falling on impervious surfaces generate lower infiltration, and consequently runoff coefficients are higher (0.80-0.95) than natural catchments (Furusho et al 2013).…”

Laboratory Assessment of the Infiltration Capacity Reduction in Clogged Porous Mixture Surfaces

“…These systems aim to mimic the natural processes by which natural environments deal with stormwater. Permeable Pavement Systems (PPS) are one of the most extensively researched BMP/SuDS techniques because of their well-proven performance in reducing runoff volumes and their pollutant removal efficiency [6][7][8][9]. These systems are principally composed of several layers of pervious materials that allow the water to infiltrate whilst retaining the pollutants deposited on their surface, which have been transported by urban runoff.…”

Research Article: Assessing the Social and Economic Barriers to Permeable Surface Utilization for Residential Driveways in Kitchener, Canada

“…Contaminant filtration from stormwater, although important to improving water quality, can cause the permeable pavement to clog, reducing its infiltration rate (Kuang and Fu, 2013). Minimal maintenance practices are therefore required to remove particles from void spaces to ensure sustained infiltration rates.…”