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You may sue your neighbor in civil court for trespass, conversion and nuisance. You could also ask the court for an injunction so he would be prohibited from using the pipe anymore.
I would recommend working with a civil litigator on this issue. First, a cease and desist demand letter will be sent to your neighbor. If he fails to remove the condition causing the flooding to your land, you could then sue and obtain the prohibitary injunction. If you are successful in your case, your neighbor will have to pay all of your legal fees.
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