Question

How to generate electricity from water pressure?

Answer 1

By hydraulic energy because it efforts some pressure due that electricity generates

Answer 2

you can use the falling water to make electricity - that's how hydroelectric dams work. But if you are using power to pump water back up then you will always use more energy to pump it up than you get back from falling down. Otherwise you have a perpetual motion machine.

The only way it makes sense is if you need to pump the water up for other reasons anyway - ie you are using this as drinking water storage and just want to recover some energy - or you can use cheap electricity to pump it up and generate a smaller amount of expensive electricity when it comes back down.