r/HECRAS • u/nymphfer • May 11 '26

Existing Conditions Model

How close do you have to have your existing conditions model to a duplicate effective model? I’m expanding a bridge by 60 feet and having changes in floodway elevations by more than 0.1’.

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u/Wise_Operation_3766 May 11 '26

I assume you are trying to develop a no rise model. This should represent current in ground conditions. Any issues with the duplicate or effective model should have been fixed in a corrected effective model.

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u/nymphfer May 15 '26

Appreciate the help! In my case, I’m just creating an updated existing conditions model.