HEC-HMS - Dam Breach Modelling - Error 40202: Root is not bracketed in Brents algorithm.

[abrown1989]

Hello,

I'm trying to run my sunny day breaches using version 3.5 of HEC-HMS. For a few of my runs I'm encountering the following error messages:
ERROR 40202: Root is not bracketed in Brents algorithm.
Lower bound: -1.4015461644160703E20 Lower bound limit: -1.7E308
Upper bound: 141.51966327346068 Upper bound limit: 1.7E308
ERROR 40243: Could not compute water elevation for reservoir "TSF".
ERROR 40261: Reservoir routing failed at simulation time "1 January 2015, 02:02:10" for reservoir "TSF".

While banging my head against my desk trying to figure out why this is happening I noticed that by simplifying the stage storage curve to only two rows it completes the run. If I simplify the stage storage to a row for every 5 m of elevation about half of the runs don't error.

Has anybody come across this issue before and if so how did you rectify it?

regards,

Andrew Brown

 

[abrown1989]

I've ended up modifying the stage storage and it now works.