title: Effects on evaporation rates from different water-permeable pavement designs.
abstract: 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.
authors: Department of Applied Geology, University of Münster, Corrensstrasse 24, 48149 Münster, Germany.
authors: P
authors: P
authors: Starke
authors: P
authors: P
authors: Göbel
authors: W G
authors: WG
authors: Coldewey
mesh_terms: D003252:Construction Materials; D010539:Permeability; D013997:Time Factors; D014867:Water; D014872:Water Movements
chemical_list: D014867:Water