Journal of
Faculty of Civil Engineering

CONFERENCE PROCEEDINGS
7^th INTERNATIONAL CONFERENCE
CONTEMPORARY ACHIEVEMENTS IN CIVIL ENGINEERING 2019 , 2019.y., pp. 735-748

	DOI: 10.14415/konferencijaGFS2019.067
	UDC: 532.533
	CC-BY-SA 4.0 license
	Author : Hovány, Lajos
	Summary:
	The international standard ISO 3846:2008 is intended for determining water discharge Q for overflow heads higher than h1=0.06 m, over rectangular, full-width, sharp edge weirs having vertical upstream and downstream faces. The subject of this paper is modular flow at h1<0.06 m. The flow in this domain might be influenced by viscosity and surface tension. Two approaches are present in the expert literature regarding determination of flow: a) this flow domain influenced by viscosity and surface tension is completely excluded of analysis, or b) the mentioned influences are neglected in determination of the Q-h1 relationship. Weirs of crest lengths of 0.095, 0.19 and 0.5 m have been examined in the hydraulic laboratory of the Faculty of Civil Engineering in Subotica (Serbia) between 28th of December 2018 and 20th of February 2019. This paper complements the international standard for determining the Q-h1 relationship at h1<0.06 m.
	Keywords:
	crest without ramps, sharp edged weir, modular flow, viscosity and surface tension of water