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Home > Forums > Civil / Environmental Engineers > Activities > Storm/Flood engineering Forum

Hec-ras ModelingHelpful Member! 

thread162-299672
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Hydrostru (Civil/Environmental)
26 May 11 16:13
How can I model a river which is "in the sky" with Hec_ras? The bank elevations are higher than adjacent aeras so once it is overtopped, the water will run away perpendically to the reach.

I was setting ineffective areas but it seems not working as the cals are showing the WS is a few feet above the bank elevations which in reality can not happen.

Thanks!
Helpful Member!  gbam (Civil/Environmental)
26 May 11 16:29
You can use lateral weirs and not return the breakout flow to the channel.  We do this all the time for sections of rivers with levees.
cvg (Civil/Environmental)
26 May 11 18:19
reduce your flow until it doesn't overtop?
Hydrostru (Civil/Environmental)
27 May 11 9:06
Only 2-year can be contained and the 100 year is 5 feet above the bank elevations. I am trying to remodel based on gbam's suggestion.
SMIAH (Civil/Environmental)
1 Jun 11 11:57
Are you sure that this water will "run away"?
Then it would really be ineffective areas.
Hydrostru (Civil/Environmental)
2 Jun 11 9:23
Yes the water will be running away. It is weird that I compared "ineffective area method" and "Lateral weirs method" and the difference in WS is minimal and I still have a few feet overtopping.
gbam (Civil/Environmental)
2 Jun 11 10:40
Ineffective boundaries are typically ussed when water will "stack up" outside of the conveyance zone.  Their use will not reduce the discharge as the lateral weir option will; which, from my understanding is what is happening here.
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