The culvert outfall protrudes the main channel walls (actually, the RCP sticks out about 3 feet into the main channel). I don’t have space for 2 additional downstream sections, other than the profile of the bottom of the main channel itself; and even then, the sections would be about 5 feet from each other.
I’ll go with the lateral structure, and report on how it went. Nonetheless, thanks for the advise, it saved me some time.
Regards,
MO