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Message: [QUOTE="combatwombat, post: 448475, member: 14119"] This makes sense. I'll have tons of leftover underlayment. That might be good enough. I meant to tag you on that. I think you're the only person I've seen on the forum that has one. Ah, yes. You're right. I was thinking about it wrong. I believe you size a negative edge skimmer on the amount of water in motion, not flow. So, if you have 3" of water in your wetland filter, a stream, and then 2-3" of water falling over your negative edge, your basin has to be sized to hold enough water for your flow + be able to capture all of that water in motion (surface area of pond * 2-3" + wetland/stream water in motion) so that you don't overflow when you unplug your pump. [/QUOTE]