Hydraulic calculation is like playing with water in a special way to figure out how it works and moves around. Imagine you have a big tub full of water with different pipes and hoses coming in and out. These pipes and hoses can be like the ones you see in a garden which let the water flow through them.
Now, let's say you want to know how fast the water is moving through the pipes and how much water is flowing through them. To do this, you need to understand a few things.
First, you need to know how much pressure is pushing the water through the pipes. Think of pressure like a big hand that's pushing the water through the pipes. If the hand is pushing really hard, the water will move faster; if it's not pushing as hard, the water will move more slowly.
Next, you need to understand the size of the pipes and hoses going in and out of the tub. Just like you need a big garden hose to water a big garden, you also need bigger pipes to move more water.
Finally, you need to figure out how long the pipes are and what direction they are going in. This can be like a big maze, and you need to know where everything is going to make sure the water flows smoothly.
Once you know all of these things, you can use special tools and math to calculate how much water is flowing through the pipes and how fast it's moving. This is called hydraulic calculation, and it helps us understand how water moves around in different systems, like in buildings or in factories.