The idea of this concept is a solution with two pressure sensors employed to measure the water level in the river. The first sensor, a stationary one, is calibrated to accurately measure the atmospheric pressure at a fixed height above the river's surface. The second sensor, acting as a buoy, floats on the river's surface and is also calibrated to measure the atmospheric pressure at the height of the water level. This buoy sensor is designed to provide reliable measurements within the same accuracy range as the stationary sensor.