Dear Jennifer :

If you are cutting cross-sections on a topo map for separate streams, they can overlap as long as you are correctly accounting for the flow. However, if you are dealing with cross-sections that overlap each other on a single reach of river, then you should correct them so that they don't overlap.

If you have any additional questions or need any further information, please contact me again.

Sincerely,

Chris E. Maeder, M.S.
Senior Technical Engineer
chris.maeder@bossintl.com