ISO/TR 9823:1990, Liquid flow measurement in open channels - Velocity-area method using a restricted number of verticals

This Technical Report describes a velocity-area method which can be carried out using three verticals only, without significant loss of accuracy, and glves advice on when such a “short-cut” method should be used.The method speciged in this Technical Report is not an alternative to the velocity-area method specified in ISO 748, which gives accurate results and should be used under normal conditions. This short-cut method has a limited field of application and is intended for use only in special circumstances, examples of which are given in clause 7.