एक खुले चैनल में जलीय उछाल (hydraulic jump) तब होता है जब प्रवाह अति-क्रांतिक से उप-क्रांतिक में बदलता है, आमतौर पर जब चैनल का ढाल किस रूप में बदलता है?

For subcritical flow in an open channel, the control section for a gradually varied flow (GVF) profile is located:

Depth of the gradually varied flow in an open channel is determined by the method called:

Which of the following equations signifies that 'the free surface of water is parallel to the bed of the channel'? (where dh/dx represents the variation of water depth along the length of the channel)