sonnyyu:
We have an other thread talk about water level measurement;-The method is discussed at thread:
Ultrasound
Pressure sensor
X band Proximity Sensor
Ku band Proximity Sensor
K band Proximity Sensor
Sound
315MHz/433MHz rf-link Arduino (radio waves blocked by water)
Bluetooth Proximity Sensor
VLF radio waves (3–30 kHz) (radio waves through by water)
Laser-based water level sensor
Capacitance proximity sensor
Resistance proximity sensor
Measurement the pump discharge pressure (if there is pump)
Float switch
at the thread, We are chatting about one single big transducer- electrostatic panels ( Made in UK) and flat ribbon drive even piezo buzzer for perfect in phase a flat wavefront.