Jump to content
GMS, SMS, and WMS User Forum

HEC-RAS overbank Mannning's n


Recommended Posts

Hello, I am working with an existing HEC-RAS model. I have noticed that when I lower the manning's n in the overbank area adjacent to the banks, the water surface actually rises. I have not done any storage routing, so the flows are the same. Please let me know why it is doing that.

Thanks,

Ashish

Link to comment
Share on other sites

  • 4 weeks later...

Hi Ashish,

That is very interesting that your water surface rises when lowering the Manning's n value. Maybe something else in your model is changing, causing your water surface to rise. I'd compare everything in your models before and after changing the Manning's value. Has anybody else seen this or have any input on this topic?

Chris

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...