Gravity discharge of the siphon drop-down branch up to the equilibrium level

The gravity discharge duration of the drop-down branch of the siphon up to the level of its equilibrium is discussed hereby depending on inclination and elevation of its ends. The determination of this period has a practical significance as that enables to implement the opening of siphon valves emptying knots at the moment when pressure in the culvert decreases, efforts to open valves considerably diminish and the siphon discharge process becomes safer.