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A durso usually has a completely submerged L section inside the overflow. I'm not sure combining the overflow and L into one assembly is going to work to give you the silent Durso action you're looking for. I believe the water level inside the bulkhead should be about half full, with no air entering from the tank side (that's what keeps it quiet).

As far as the pump, yes you're going to need something with a good amount of of head rating. Two things:

1.) DC pumps are usually more efficient and better for dialing down electrically. I don't know what options are out there for smaller systems.
2.) I would suggest Teeing off the return line, with the new line returning back to you sump. Put a valve on that line. You can reduce the amount of water pumped to the tank by opening the valve (returning to the sump) more, without putting excess strain on your pump.
 

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I see so the way I have it set up the air will get sucked in through the tank side making the durso obsolete. I want to get some surface skimming action and that is why I wanted to do it this way. I am wondering if with such a low flow will I have that much noise to begin with. I could always do it this way and modify the overflow if noise is a problem by submerging the overflow. I also got the suggestion of putting a valve on the end of the outflow so the pipe only has water in it but that to me seems like asking for trouble.

I think I am going with a danner mag 3 pump and am going to have 2 return lines, one going to the main pool and one powering the waterfall. I am thinking I will put a valve on at least the return going to the pool possibly both to control the flow going to the waterfall. Would this be the same as your suggestion of running a line back to the sump?
Its entirely possible that I ( or we) am overthinking this on a small system. There may not be enough water moving that noise is a problem. I think it might be possible to achieve what you're looking for by placing a downward U section between your overflow and the bulkhead. The U would fill with water completely, forcing the air to come in from the durso instead of the overflow.

Tuning a valve on the outflow is only a good idea if you have a secondary / emergency outflow. The beananimal overflow system works on this concept. First pipe is entirely water (by tuning the valve on it), second is just the slightest trickle, third is emergency.

The idea of having a line that returns to the sump is that you are controlling how much water goes to the tank without impacting back pressure on your pump. Therefore, splitting some to the waterfall does not achieve that, as its still entering the tank.

I highly recommend valves on each in/out as its very nice to be able to shut off or change the flow to each particular section. Once again, may be overkill for your particular application. The valve on the line coming into the sump is for when you want to isolate water in the tank.
 
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