Here is a tested Arduino project that uses 3 sensor probes as water level indicator with 3 leds and one LCD display + a simple controller that turns on a motor when the water has reached the desired ...

Helpful devices To control overflow of water tank, the shops are also offering similar devices. Automatic water level controller circuit can automatically switch on and off the water pumps.

Author Ejaz ur Rehman describes a an extremely simple water-level maintainer that keeps the water level between two predefined levels using an LM311.

Using the motor starters available in the market, a Hindustan Shipyard Limited (HSL) employee has come out with an automated starter to save overflowing water and the electricity used for it.