Hi,
I want to have a automated water tank filling system fitted for my new house under construction.
What I am looking for is a kind of system which can automatically switch on the motor as soon as the water on my overhead tank is below certain level ?
Additionally the system should not start the motor if the water level is low on my reservoir tank at the ground level.
Some sort of intelligent system

What are the possibility and recommendations ?
Hope to get a expert advice as usual
Ben