Full Siphon Standpipe

Today I assembled the full siphon standpipe. As you can see from yesterdays pictures I did not have the union or ball valves as part of the dry fit. All the fitting on this channel are now cemented into place.  I think I'm only going to use union valves for the open channel and emergency standpipes in order to breakdown for cleaning. I cannot think of any reason why I would need ball valves on these channels. Probably next week sometime I will finish the overflow plumbing.