Reference Specifications for Civil Engineering Work 2001

Relative to a 3 m straightedge*

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• Other ground surfaces Absolute level tolerance : ± 50 mm, provided the area matches adjacent construction. Horizontal surfaces

Relative to a 3 m straightedge*

Sub base	+ 10 mm - 30 mm	10 mm
Base	 10 mm	5 mm

* Limits to incorporate due allowance for design shape where relevant

Crossfall

Measurement: Measure crossfall at sub base and base transversely to the centreline. Ensure that the two selected points are more than 2 m apart.

Requirement: Do not depart from the corresponding design crossfall by more than 0.2% absolute. Maintain positive drainage slope towards pavement drainage system.

Other ground surfaces

Absolute level tolerance: ± 50 mm, provided the area matches adjacent construction.

Horizontal surfaces

Absolute tolerance: ± 50 mm, except where alignment with an existing road structure is necessary. Join new construction to the existing work in a smooth manner.

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