Permeable pavement allows stormwater to drain through the surface layer into a stone reservoir. This is where water can be stored and then infiltrated into surrounding soils. Permeable pavement is designed with an overflow and an optional subdrain feature. Key features for permeable pavement designs are shown in the diagram below.

Parameter Name Description Default Value
Surface Area Ponding
PERMEABILITY Rate with which water moves through porous materials (m/hour) 1
DEPTH-AREA CURVE Depth area curve for surface ponding area, depth is defined from the bottom of the ponding layer.