Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? Intake Pipe Blocked

You might want to contact a plumber who has a camera on a cable. He can run it into the pipe and see what the blockage is.

Unfortunately, being that old, and if it is a steel/galvanized pipe, it might be collapsed.

Be VERY careful of removing any blockage if there is water covering the pipe. Depending on what end of the pipe you are working from, you could get sucked into (or up against) the pipe, or get blown away from it by the force of the water and debris. If you're sucked up against the pipe, and underwater, you might not be able to work yourself free to get to air.