re: Settling PVC Pipe Cracked - How to Stop

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You have a rainwater collection system with a 6” pipe is what you are saying? 6” pvc is pretty damn strong so you have some serious forces working on it to crack it, you need to fix that or it won’t. As said 6” seems overdone?

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My assumption is the 6" pipe is run underground to a catch tank. I assume the catch tank is above ground. So the 6" pipe probably has water in it at all times? Could be visualizing this totally wrong though. If it is a 6" pipe filled with water at all times, that's not going to be light, hence settling the settling. Likely need a pretty solid base of limestone or under the pipe before covering to assist in stopping that. Smaller pipe would help with the weight, but may hinder flow when it's raining, since a system as described is relying on hydrostatics to fill the catch tank and unless your house is on top of a hill, you don't have a ton of pressure working for you.