I'm trying to recreate a phenomenon I have noticed from our water tank at home. Ok so we have a deep well pump that fills our water tank everyday. But something odd always happen everytime the water tank is full. The tank has an outlet(actually just a pipe sticking out of the tank) where the water spills out when the tank is full. This is when the phenomenon happens, when we turn off the water pump the water will keep spilling out of that outlet pipe FOR HOURS! Even though the water pump is already off the water will keep spilling out of that outlet pipe. The only proven method to stop the water spilling is to turn on the faucet in the house meaning to use the water. Once when I was alone in the house and the water started spilling after the pump was turned off, it was 6pm, I waited it out and see if it would stop by itself. I waited for 2hrs, finally I had to turn on the faucet in the house around 8pm to stop the water from keeping on spilling.
So here's what I was hoping to do. My mom has been complaining about the high electricty bill. One of our highest electricity usage is the water pump since it takes an hour(more or less) to fill that tank with water. And we fill it twice a day since we run a room for rent business. I was hoping I could recreate that phenomenon and build a tank(a smaller one of course) on top of the main tank. Then all we have to do is fill that new tank with water for lets say 15mins and let it spill water into the main tank for the entire day.
Here's a link on a diagram of our water tank.
Hope someone can help. :)