I recently moved the levy from my old pond to catch the next hill to take on more acres of runoff. In the process of digging the core the operator dug up an old 4" field tile that was being used as the dribble pipe from the old pond. He left the tile there so it now runs from the core to the actual pond. He says that it wont matter because the core will stop it. I'm not comfortable with that. I plan to fill it with concrete as best as I can buy pouring/pushing wet concrete down the tile via 2" pvc and a plunger made from 3/4" pvc that has bushings glued to the end to fit the ID of the 2" PVC. Any thoughts or suggestions? I think it is something that needs to be addressed. Am I wrong? I don't want to find out when its too late. Its probably 20-30 ' long and maybe 10-12 ' below the future new pond level.