Yes, exactly. If the channel walls touch the top of that peice and seal off each hole to each channel you should be able to control the flow of each channel and tweak it to the maximum effeciency. You might even be able to get 2 holes in the middle channels.
I might be way off base but it is a thought. Only thing that makes this different than a slit is you can make each hole bigger or smaller to tweak every channel. If you just use a slit and the channel walls touch the top you will still have the same effect but you will not be able to adjust the flow in each channel aswell. In theory anyway.
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