Mapping Weir length to Tail Water Side Length

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Mapping Weir length to Tail Water Side Length

kayakscott
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eagle_lateralstructure_ss.prjI am trying to define an island that overtops at higher flows.  I need to see the performance of the water at regular flows in the separate channels and then evaluate the performance as the water inundates the island.  I have created a lateral structure but continue to get an error that says: -Lateral Structure data specifies a weir line plus upstream distance that equals or exceeds the length of the reach.  I believe that I am somehow mapping these lengths wrong (the automatic answer didn't work either).  Any ideas or can anyone explain the methodology for making sure that these are consistent?

Thanks in advance!  Here is the file if you would like to see what I have done.

https://www.dropbox.com/sh/o8jwgroq8xv07bq/AABsFeuQl8krfTHHIjVXxCsZa?dl=0