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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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Term of the Road Dictionary

Froude number

  • Language : PIARC Road Dictionary / English
  • Theme : Roads Drainage and Sewerage
  • Definition : Dimensionless number expressing the ratio of inertia forces to gravity forces. Note: in open channels, flow is subcritical, critical or supercritical if its Froude number is less than, equal to or greater than unity, respectively [Termium Plus®].

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