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I'm using HEC-RAS to model a floodplain in which a drainage ditch splits at a point, then recombines some distance downstream. I've attached a schematic of the system showing what I'm calling the Main Reach and the Bypass Reach. After the split (XSEC 11+12), the Main Reach routes through a...

Crystal: Yes, I was using the paired data manager in version 3.4. Froude: That's exactly what I ended up doing - just building a new model since it's fairly small. That did the trick, so thank you! I'm still curious as to why a copied model would just delete the paired data set, and not allow...

I'm working on a very simple HEC-HMS model consisting of one drainage area, and one detention pond with a culvert as the primary outlet, and the dam top as the auxillary outlet. This model works fine. The problem comes when I copied this model to test a condition when the primary outlet...

Thanks to you both! I understand that there is no floodway associated with Zone A, and yes, if a LOMR were submitted for a Zone A stream it would become Zone AE with established BFEs, floodway, etc. Froude, what you mentioned about my client being interested in floodplain approximations is...

Hello, all. One of my clients, a local municipality, is in the process of developing a new floodplain management ordinance. They have requested that we provide them with some recommendations as to best practices within Zone A riverine floodplains. They want to include in the ordinance a rule...

Hi, all. To summarize my situation and goal, I am trying to design a solution to lower the current water surface elevations along an existing rention pond/channel. Due to various constraints on the property, the most viable option I have right now is extending the existing pond and...