Cross Fall

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 A level surface sloping to one side only allowing surface water to run in the direction of fall.

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  • Cross falls are generally used on paths where the natural drainage is not suitable for a camber, like crossing a side slope, or on bends where the radius of curvature is small.

  • Cross falls are easier to form than cambers as it slopes in one direction only.

  • Wheeled users prefer cross falls of less than 2.5% (1:40). Steeper cross falls can make steering difficult over any distance.

  • It is generally recommended to produce a cross fall inwards on a side slope to prevent users on wheels inadvertently steering off the path. This is called insloped.

  • The slope from the higher side of the path towards the lower side should be maximum of 2.5% (1:40), preferably minimum of 2% (1:50) for cyclists, wheelchair or mobility scooter users.

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