The surface of the water at the top of the tower is at 101,000 Pa. The end of the pipe is also open to the air so it is at 101,000 Pa. Thus P1-P2 = 0. Sorry if my reference to the pond confused you. I was just trying to help you picture a physical situation. As usual, we approximate the velocity in the tower as negligible compared to the velocity right at the pipe outlet. I am sure you can take it from there.
Enjoy the rest of your break.
Dr. Cherdack
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