Does your department lay its own line from a hydrant or do you bring it to the scene via Tankers? Each has its own challenges. First let’s look at laying a supply line. Some departments require the first in engine to lay a dry line and the second due charges the line. Others require the first in engine to establish their own water supply. While other departments have the second due catches the hydrant and secures the water supply. When catching your own hydrant, some issues arise.