How do siphons function in dosing tanks?

Siphons function by utilizing the difference in height between the water levels in the dosing tank and the discharge point, creating a situation where head pressure can generate suction. When the water within the dosing tank rises to a certain level, it begins to flow into the siphon tube. As the water flows, it creates a vacuum behind it, allowing more water to be drawn in. This process continues until the water level in the dosing tank drops below the level of the outlet of the siphon, at which point the siphon effect ceases.

This explanation highlights the importance of gravity and head pressure in the siphoning action. The siphon process is efficient for emptying tanks in a controlled manner without the need for pumps or additional power sources.

Other options involve mechanisms that do not accurately describe the way siphons work. For example, while siphons do rely on gravity, they specifically use head pressure and not just gravity alone. Moreover, the manual triggering of siphons misrepresents the automatic action that occurs due to the functional design of siphons, which respond to the tank's water levels rather than being manually activated.