LIDLayerPavement Properties

Volume of voids that are clogged due to fine particles accumulation.

Use a value of 0 to ignore clogging

Evaporation rate [m/s].

Evaporation only takes place if the upper layer is unsaturated

Fraction of impervious paver material of total area; 0 for continuous porous pavement systems

Unit: [fraction] Default value: 0 (all is pervious)

Moisture fraction, volume of pore water relative to total volume (as a fraction).

This fraction is always between zero and Porosity.

Moisture fraction of last time step

Percolation rate. [m/s]

Speed of the water through the pavement, effectively used as infiltration rate from soil to lower layer

Permeability [m/s] of the concrete or asphalt used in continuous systems or hydraulic conductivity of the fill material (gravel or sand) used in modular systems .

The permeability of new porous concrete or asphalt is high (>2450 mm/hr) but over time the fine particles in the runoff tend to clog the pavement, reducing the permeability of the structure.

Pavement porosity; void volume fraction of total volume.

Thickness of pavement layer [m]

Volume of water per area [m] contained in pavement