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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IMEKO-TC11-2023-02.pdf

DOI

10.21014/tc11-2023.02

IMEKO TC

TC11 - Measurement in Testing, Inspection and Certification

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