Water remains a major issue as we enter the third millennium where more than one quarter of the world do not have safe drinking water. Consequently there is an increasing demand on hydrometry to provide the essential hydrometric information in order that the world's water resources can be managed more efficiently. This text deals with methods of measuring the flow in rivers and open channels to obtain the necessary data to serve, among others, the following functions: the supply of water systems; the control of pollution; the design of highway bridges and culverts; the management of floods;...