floodnovice
Civil/Environmental
- Aug 15, 2011
- 2
I am working on a CLOMR for the first time and I need some technical guidance. The project proposes to change a trapezoidal concrete channel into a rectangular channel with fish passage. I have prepared the natural run of existing condition and the proposed condition in HEC-RAS. When I compare the natural run of existing against proposed, I see variations both up and down. Now, how do I show that the BFE will not increase by more than 0.0’? How do I prepare the Floodway run? I also need to show that the BFE will not increase by more than 0.0’. I think I need to use encroachment for these two purposes. But, what should be the target increase? If I input target WSE increase of 0.0 foot and use encroachment, I see no changes to the WSE or any encroachment station. If i use 1.0', I see up and down variations. What is tie-in within 0.5’ at the transitions and how to show that?
So, my questions are as follows:
How to prepare the Floodway run?
How to show that the BFE will not increase by 0.0’ or more than 1.0’?
What is tie-in within 0.5’ at the transitions and how to show that?
Can you give me some ideas and/or send me any written procedure? I very much appreciate your help.
So, my questions are as follows:
How to prepare the Floodway run?
How to show that the BFE will not increase by 0.0’ or more than 1.0’?
What is tie-in within 0.5’ at the transitions and how to show that?
Can you give me some ideas and/or send me any written procedure? I very much appreciate your help.