We filter this water after the creek diversion since we use it downstream for sprinklers. If we opened it up to ditch, that exposes it to debris which would plug the sprinklers.

I'm guessing each cleanout, if added, at about $200 each not counting labor. 6" repair couplings, pipe, and fittings are pricey.

I do have a trash pump. It puts out 160gpm and I don't think I can regulate its output pressure. I don't want to blow up my pipe or cause more problems. So maybe I need to consider how to plumb in a trash pump that also has some pressure relief valve included?