How do you set the minor loss coefficient for tees?

Hi, guys.
I’m developing pipeline systems of the warships.

In this study, we assume some damage scenarios that is from the enemy’s attacks.
From this damage scenarios, rupture is occured, then we can observe some water distributions that is different each other according to the damage scenarios.

Here is my questions.

How do you get the minor loss coefficient from tees?
I know that the minor loss coefficient is determined from the ratio of branch and input or run and input.
If I determine the minor loss coefficient value, the ratio of them will be changed.
Furthermore, I have to determine the all of different values for each different damage scenarios.
Is it right to determine them with this way?

Thank you for reading.