Thanks for all the reply so far. Ha ha Ha.
This is what I have learned so far. Horizontal 2 inch pipe flows approximately 2400 gallons per hour.
The other issue I'm having is introducing Erin to the system. Because it's not a vertical system and ask a little different I have learned.
I had the 2 inch pipe with an elbow with another pipe into the water in the pond. I had the pipe in the water was too tall and it was air bound. The pipe going into the water is directly impacted by how tall the water in the sump is.
I tried drilling two small holes in the vertical pipe into the tub in this allowed water to flow from the sump into the pond.
Then I figured out that if I shortened the pipe in the pond it would not air bind.
So with approximately an 8 inch pipe in the water it would flow out of my sump no problem. This was because the water was able to get higher than 8 inches in the sump and push the air out of the pipe.
I also learned that with no air in the pipes it would increase the flow rate dramatically. The water will flow from the sump into the pond, make no bubbles, and flow 2400 to 2500 gallons per hour by my estimate.
If I again added a small hole into the pipe to allow Erin, it's slowed my full rate down significantly. This little bit of air was nice because it oxygenated the water, and it slow down my flow rate.
So now what I may try to do is put a tee in the line somewhere and a snorkel pipe so I can introduce air into the system and oxygenate my water, as well as slowing my flow down slightly. I wanted to slow the flow down slightly so I can get more water volume in my sump to submerge my bio balls.
I currently have 4 feet of head. I am running one Danner 18 Mag drive pump, as well as a DCP 10,000. . With both of these pumps running and 4 feet of head, I am only able to fill the sump halfway with the 2 inch pipe running at full siphon with no introduction of air.
Tomorrow I will try to add a valve to restrict the flow of water to see if I can't get the system tuned correctly. Wow I like adding air to the system so it oxygenates the water, I don't know if I will do that or not. I like having no air in the line as it makes the pond nicer aesthetically. As a result, I may just add some air bubblers to the song to get oxygen in this way.
After I try restricting the flow with the valve, I still may add a tee into the system and regulate the air just as an experiment to see what kind a happy medium I can gain.
Having the sticky in this section was a little confusing because it said the horizontal flow was 1500 gallons per hour. Clearly this is not completely true. If I had realized it flows closer to 2400 gallons per hour I would've opted for a smaller pipe size. ( i have two 2 inch lines. I only really needed one. The pond will be 400 gallons. )
