first steps with Hec-Ras

[JoeClark]

Hello all,

I wanted to ask what I need to include in the “cross section data” window, especially as it asks me:
1) Downstream Reach lengths
what should I put in ROB in channel and LOB?
2) Even with regard to “Manning’s n Values” and the following section “Main Channel Bank stations” I did not understand what values ​​to enter.
Thanks in advance for those who will give me some clarifications.

I didn’t find the right solution from the internet.
References:
http://www.ingegneri.info/forum/viewtopic.php?f=4&t=21072

motion graphics examples

[Igloo_79]

Hi – you should be able to find the answers in the official HEC-RAS manuals. However… regarding Q1, the DS reach lengths are the distance downstream to the next XS.

– Channel – distance between channel inverts, usually measured along the river centreline/reach line
– ROB/LOB – distance between L and R bank stations; you can measure these manually along the banklines (you need to turn them on in RAS Mapper), but if you have lots of XS then it can be automated by exporting the banklines as a shapefile and analysing in GIS.

Good luck!

[Author]

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