This is a simple but very reliable water level indicator alarm, aka flood sensor. Easy to build, Works well. In the video, I'll show how to build water level alarm using just a few components. For building, you will need, IRF540N MOSFET transistor (or similar), 1Mega Ohm resistor, Active buzzer, some wires and a 12V battery or a 12V power supply.
If you have any questions ask in the comments below.
