maximum flow through a 1.5" herbie

[mark]

Originally Posted by Zylumn

Using the Drain Hole and Overflow size calculator on RC a 1.5" drain hole at 20" head (as per what Untamed was explaining) it will drain at 1325gph and anything higher than 20" will raise the gph.
Kevin

Where on the calculator do you get the height? If I put in 1325gph my understanding the 20" linear inches is the length of the weir.

[Zylumn]

Originally Posted by mark

Where on the calculator do you get the height? If I put in 1325gph my understanding the 20" linear inches is the length of the weir.

Your right thanks Mark. Let me start over on that.

With a 1.5" hole you can drain 1325gph at 20" linear (which has nothing to do with what Untamed was talking about) but if you increase the linear you can as per RC calculator increase GPH.(not sure why as it becomes a side ways pressure instead of a down pressure) ??? LOL

Kevin

[mark]

Believe the recommended weir length is just for designing a overflow box that will give you ~0.25" rise of water over the weir for good surface skimming.