First of all, I forgive you for not understanding the principles of hydroelectric power generation.
To produce electricity, you need potential energy and kinetic energy. By the way, the kinetic energy you mentioned is one of the energies. The water level is low and the flow is high. If we want to produce the same output, the speed of the unit will be very low and the size will be large. When we want to fully utilize the water resources of the river, the selected value. This model will exceed our human capabilities. For example, ultra-low speed and ultra-large size (theoretically exists). Our materials, structure and project cost can all exceed the standard. Either the extraordinary model cannot be produced or it cannot be exploited. Consequently, the development of a river basin is a matter of rational use of water resources. Make reasonable use ofthe potential and kinetic energy of water and choose a reasonable model. And to satisfy us as humans. And this cannot exceed our capabilities.
At present, the highest water height can reach more than 1,000 meters, and the lowest can reach 1 to 3 meters. Different models are available. Every shape is also subject to structural constraints, and you don't have to be as big as you want. As small as you want. For example, for impact units, we only have 6 nozzles at most. For bulbs, the minimum water height is only around 2 meters, which is subject to certain technical restrictions.
The reason for these large fluctuations is that the liquid level fluctuates greatly and will not cause interference.
Your electrical contact level gauge is not a continuous value but a switching value. For example, 4 points of vSwitching value corresponds to 4 lights. . .
In addition, ultrasonic waves cannot be used to adjust the water level of hot water wells, although Siemens ultrasonic waves are very good.
The most common current measurement method for hot water wells is guided wave radar.