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Message: [QUOTE="addy1, post: 289215, member: 2547"] The only thing with a flow like that (I found out with a previous build) the gravel gets covered with muck and can get blocked enough to over flow, it quits flowing down through the gravel. I found out the hard way, the pond almost emptied! You might want to have some biggish pieces of pvc, with a lot of holes drilled in them, planted in you gravel (no media in the pipes) so the water can flow into the pipes and out through the gravel. Leave the pipe tops open for the water to flow into them. [/QUOTE]