Hello, I am running very large model for a river system in an urban area. I am modelling the effects of a relatively small amount of fill in the floodplain. When run, this causes 0.00′ of rise in WSEL. However, when I add an excavation of about the same size, and decrease the n-value (both of which normally reduce WSEL), I get a WSEL increase of 0.01′! Any idea why this happens and how to remedy it?
Thanks!