About how a water tower works.
This image shows typical piping for a water tower. The water spout shown is generic with spouts varying in design. The spout in this image is item F labeled “Zuraw Typu Austriackiego”.
The image is from page 66 in the book Jedrzejowskie Koleje Waskotorowe written by Bogdan Pokropinski . You can get it in several places on the web.

I will be adding a video showing an engine taking on water.