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DSM2 inputs are off by 1DAY

DSM2-241 - Check daily inflows and warn if INST-VAL Open

A problem was reported with a run that was supposed to be a historical run with inflows scaled up by a factor. 

  1. Here's a plot of model output at Vernalis
  • Blue=historical stage output
  • Red=scaled up stage output
  • Green=historical flow output
  • Black=scaled up flow output

On February 14, 1992, both the scaled up flow and stage outputs are higher than historical.

2. The problem was caused by the "Type" of the scaled up flow input tine series. The user had created a series with a type of INST-VAL.

This results in changes in inflow taking effect at the end of the day rather than the beginning of the day.

One way to tell that a 1DAY time series is PER-AVER vs INST-VAL is that HEC-DSSVue plots PER-AVER time series as a square wave, but not INST-VAL.

3. To check Type and to change it, in HEC-DSSVue, right click on the series and select Edit, and 

use the dropdown to select a new type.

4. After re-running with the change, results are as expected.

Attachments:

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