I am current attempting to model inlet and outlet extensions on an existing culvert using Geopak Drainage's culvert tools. Is it possible to model said culvert as a storm sewer system with junction boxes acting as the existing inlet/outlet and still obtain the headwater and tailwater outputs? It seems as though simply modeling the entire culvert as a whole would work better as long as the appropriate length was provided and the proposed inverts used.
Any experience or suggestions on the subject?