Dear Jennifer :

I looked at the input data that you furnished, and you have a sloping dam crest defined. However, the lower end of the sloping dam crest elevation is at 18.50 ft and your spillway elevation is at 20.40 ft. Hence, DAMBRK is stating that this does not make sense. The dam will start to overtop before the spillway starts to become active.

Sincerely,

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