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Very Small Negative Water Surface Elevation Change for Encroachment Analyses
In my floodplain encroachment analyses, there is a negative (-0.03 ft) water surface change between the natural 100-year profile and the encroached profile. I tried numerious combinations of encroachement station placement for the affected cross section, a few cross sections upstream and downstream. Even I placed the all encroachemnt stations at the 100-year water surface left and right stations for those cross sections, the negative number still cannot be eliminated.
Have any of you run into this kind of problems before? Do you know the causes and how to solve the problem?
Thank you very much!
Shuhai
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