[Davis Murphy]

Luis, I appreciate the reply and the various concerns you shared, but my question was specific in order to narrow the focus of the answers I received.

To be clear, I am not using anything from HEC-HMS except to handle the rainfall abstractions using curve number. HEC-HMS produces an excess precipitation hyetograph and that is all I need it to do. Everything else produced by HEC-HMS is discarded for the purposes of the analysis. The rest of the modeling is done in HEC-RAS, so the time increment used in the HEC-HMS control file is irrelevant to the analysis. At least, it should be, and that is why I asked the question because I was seeing a possible issue with the way that data was handled in HEC-RAS. Now that I have run some more tests, I have been able to show that hyetograph data time increment does NOT affect the inflow volume to the models I am running in 5.0.7.

With all of that said, I am satisfied that the initial question has been answered.

[Davis Murphy]

Thanks for the reply cameron. I recently ran a series of simulations in 5.0.7 and am no longer seeing the issue.

Here’s a summary of results where I have altered the precip data time increment in a single HEC-RAS 2D rain-on-mesh model (precip only) and compare 2D Inflow Volumes from the computation log file:

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