The urban water balance can be attenuated to the natural by water-permeable pavements (WPPs). Furthermore, WPPs have a 16% higher evaporation rate than impermeable pavements, which can lead to a better urban climate. Evaporation rates from pavements are influenced by the pavement surface and by the deeper layers. By a compared evaporation measurement between different WPP designs, the grain size distribution of the sub-base shows no influence on the evaporation rates in a significant way. On the contrary, a sub-base made of a twin-layer decreases the evaporation by 16% compared to a homogeneous sub-base. By a change in the colour of the paving stone, 19% higher evaporation rates could be achieved. A further comparison shows that the transpiration-effect of the grass in grass pavers increases the evaporation rates more than threefold to pervious concrete pavements. These high evapotranspiration rates can not be achieved with a pervious concrete paving stone. In spite of this, the broad field of application of the pervious concrete paving stone increases the importance in regard to the urban climate.
Research Article|June 01 2011
Effects on evaporation rates from different water-permeable pavement designs
Water Sci Technol (2011) 63 (11): 2619-2627.
P. Starke, P. Göbel, W. G. Coldewey; Effects on evaporation rates from different water-permeable pavement designs. Water Sci Technol 1 June 2011; 63 (11): 2619–2627. doi: https://doi.org/10.2166/wst.2011.168
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