La résistance d'entrée de l'eau dans les drains en polychlorure de vinyle annelés

CEMAGREF, Antony

Abstract

Water entrance resistance into polivinyl-chloride drain tubes All the formulae used to determine drain spacing assume the drain to be ideal. Real drain however consists of an impervious wall provided with small openings in order to admit water. The convergence of the streamlines towards. these openings gives an entrance resistance, which reduces the hydraulic head available for drainage. On the other hand the drain manufacturers prefer drains with a small opening area because of the price and the strength of materials. This paper presents how to find out the optimum value of the opening area and of the perforations width.