Total dynamic head

Okay kiddo, do you like water slides? Well, imagine that you are at the top of a water slide and you want to go down to the bottom. The water at the top of the slide has energy, like momentum, that helps you go down. But as you go down the slide, you encounter things like bumps or twists that slow you down.

Total dynamic head is a way to measure how much energy the water has at the top of the slide and how much energy is lost as it goes down. It takes into account all the things that might slow down the water, like friction or gravity.

If we use the water slide as an example, the total dynamic head would be how much energy the water has at the top of the slide (when it's the highest) minus all the energy that it loses as it goes down the slide. This includes how much energy it loses when it goes over the bumps or twists, and how much slower it gets as it goes down because of gravity.

So, total dynamic head is just a way to measure how much energy water has at different points of its journey, and how much of that energy is lost as it moves along. It's important to understand this concept if you are working with things like water pumps or turbines, which depend on the energy of the water to work correctly.