loud "knock" heard and now water trickle

[Madge]

Hello: I am not sure these two incidents are related, however, it seems that I now have a trickle of water 24 hours a day. The trickle is inside a copper pipe that is located inside the pipe that holds my washer hose. I don't know where the water could be coming from. I checked the washer hose, and the water is not coming from there. The pipe right next to the hose is a pipe within a pipe. Weird...it is copper and attaches to the wall...straight up.

SOOOO....does anyone know 1. Where is the water coming from?
2. What is this copper pipe used for?
Thanks, Madge

 

[FloridaOrange]

Pictures would help. With the copper pipe it almost sounds like a condensate line. If it is there is a possibility that it is a secondary drain if you've never noticed anything coming out of it.

Do you have an air handler around there?