How do I calculate water volume leakage in a buried 1" schedule 20 PVC (140 feet).
I can isolate the line and use a pressure gauge to see how much the pressure differential loss I have over a 24 hour period of time.
I turn off the water before cold weather but there is no easy way to drain it since there is little elevation change from one end to the other.
Thanks
Do you have city water with a meter? Easiest way is to monitor the meter with all other outlets shut. I assume this is for lawn sprinkling or other irrigation. Why do you need to measure the loss? If it’s a lot you really need to find and fix the leak, if it’s a small amount it’s still providing water to the plants unless you’re in a situation where it just drains away underground.
If it holds pressure at all after 24 hours it’s probably not leaking. Losing a couple tablespoons would drop it to 0. If you want to know if a line is leaking pressure test it with an air compressor.
The volume of water on a leaking pressurized line is rather irreverent. It’s unlikely to remain consistent and will likely get worse.