Hi All,

I'm looking for someone to independently verify some results from Hydraflow Hydrographs. I'm baffled as to the behavior of this tool and would appreciate your thoughts to help explain it.

The situation: the pond has a wet pond elevation at 491. Thus, storage of incoming hydrograph should begin at this elevation. In my original work with this data, I noticed that the model lacked contour information for stages 1 and 3. I added data for these two stages, which did provide more detail, but did not affect storage for the pond. In fact, it shouldn't change any of the results since stages 1 and 3 are below the wet pond elevation. However, the results were dramatically different when compared to the original data set. Why is this? Why would additional information, which should not impact storage, change the results in any way?

The Hydrograph files are attached. The "design" condition is "13010 revised pond 2-15-12.gpw" and the same data set with contour data below 491 removed is "20140624 What If Scenario...".

I'd value your thoughts on explaining the behavior of this tool. Perhaps this is a bug or maybe there's a rational explanation that I'm overlooking.

On a broader topic, does anyone have suggestions on how to get technical support for this tool?