How do you measure water levels?

Staff Gauge / Ruler — visually read water level against a marked scale in rivers, lakes, or tanks.

Float Mechanism — float rises and falls with water, linked to a counter or mechanical indicator.

Pressure Transducer — measures water pressure at the bottom and converts it into water level.

Ultrasonic / Radar Sensors — send waves to the water surface and calculate level based on return time.

Bubbler System — uses air pressure in a submerged tube to determine water depth.

Satellite / Remote Sensing — measures water level changes in large reservoirs or lakes from space.