The roughness of a surface can be defined by it's macro texture. Horizontal drainability is the capacity of the road surface to provide interconnecting voids through which water can be squeezed out by a moving tyre.
Roughness
ZAM 5090 Flow Measuring Unit acc. to Moore
Flow measuring unit according to Moore for determination of the horizontal drainability of a pavement surface and for checking the macro texture (roughness) .
