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Experimental determination of absolute roughness of concrete conducts in a water supply network

L. Martins, A. Ribeiro, C. Simões, A. Pais, R. Mendes
  • Abstract:
    This paper describes the experimental determination of the absolute roughness of concrete conducts in a pressurized water supply network related to agricultural irrigation. Based on the Colebrooke-White equation and using a Monte Carlo method, the following estimates and 95 % expanded measurement uncertainties were obtained for a circular concrete conduct with an inner diameter of 1,2 m: 0,060 mm ± 0,055 mm and 0,021 mm ± 0,024 mm, for a water flow Reynolds number, comprised between 1,7·105 and 5,1·105, respectively. The output probability distribution showed a non-symmetrical shape, and the volumetric flow and pressure drop measurements were identified as the main contributions to the obtained dispersion of roughness values.
  • Keywords:
    Hydraulics, Conduct, Concrete, Roughness
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  • DOI:
    tc11-2023.02

Event details:

  • IMEKO TC:
    TC11
  • Event name:
    IMEKO TC8, TC11 and TC24 Conference
  • Title:

    Testing, Inspection and Certification for Confidence and Safety

  • Place:
    Madeira, PORTUGAL
  • Time:
    11 October 2023 - 13 October 2023