Bulk Head Question

[golf nut]

This is one of many permutations, it is not easy to build unless you have the proper equipment and have reasonably accurate flow factors. Size is dependent on return pump numbers, but typically most systems fit into a similar category.



Light blue is typical water level for siphon system.
Dark blue is open channel.
Red is safety

Accepting the fact that the diameter of the red pipe is adequate enough for capacity of the return pump.