ABSTRACT
This chapter presents information about discharge relationships for control sections and about component losses. Discharge relationships for complete hydraulic structures are discussed but not presented in detail as these must be considered case by case. The chapter describes the corresponding discharge relationships of control sections. If the structure has some length in the direction of flow, the hydraulic losses for different components are also involved; these include entrance- and exit-losses, friction losses, and losses at a hydraulic jump. A dominant element is the discharge relationship of the control section. This control section can be a sill or an opening or a narrow flow section. The hydraulic jump relations are necessary to establish the upper limit of the downstream water level for which modular flow still occurs. The application of the momentum equation for the hydraulic jump is well- known. The graphs are based on the momentum equation for a rectangular prismatic canal which lead to the familiar result.
