Initial Values

[mpiedade]

Greetings,

I was having problems with initial values in my Unsteady Flow simulation, so I decided to do what it says in the manual when we're having stability problems at the very beginning of a run. I run the model with all inflow hydrographs set to a constant flow, and set the downstream boundaries to a high tailwater condition and decrease the tailwater down to a normal stage over time. Once the tailwater is decreased to a reasonable value, those conditions were written out to a DSS file, and then used as the starting conditions on the unsteady flow run. But when I run my model the message "The Hotstart file is not from Version 3.1.3 May 2005" appears in the Computation Messages Box, like in the attached picture.

I would like to know how I can solve the problem, and so, in witch way I can use a Restart File from a previous run in my current model calculations.



Thanks,

Mónica Piedade,

Master Degree Student in Hydraulic, Water Resources and Environment

Faculty of Science and Technology
University of Coimbra
Portugal

[hydro_serbia]

I had a problem once, I used and old file from previous version. I think you should do exact how computational message displays, and that is creating hotstart file with curent HEC-RAS versions by re-running the plan and set of unsteady flow data. Try to use an option in unsteady flow analysis under menu options - output options - Restart file (write initial conditions file). You are required to put a time in hours from the beginning of the current simulation, which represents the time at which the conditions of the system will be written to the hot start file.

Regards from Serbia!