oa Civil Engineering = Siviele Ingenieurswese - Discrepancy of the Colebrook-White equation in the extreme rough turbulent zone

Volume 26, Issue 11
  • ISSN : 1021-2000



Following some experimental observations in the Crocodile River near Brits, it is shown in this paper that the Colebrook-White equation loses its validity in the extreme rough turbulent zone where Manning's n exceeds about 0,05. Consequently, It is recommended that the Colebrooke-Whlte equation should not be applied in this zone. A number of important research requirements with regard to the Colebrook-White equation, are identified In this paper.

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