DAMBRK Analysis Runs

Chris -

Hope all is well wherever your trianing has taken you.

I have some qtns regarding the DAMBRK software and the Eagle Nest Project, north of Albuquerque NM. We have the program installed and now I am in the process of entering the XS data into the input files. I am currently inputing this data into the Sunny Day Breach analysis. As I enter the XS, I only do like three at a time, then save and exacute an analysis. It seems to me in training that it took a while for an analysis to run. My run times are only like a couple of seconds and then I look at the output. Can you give me some hints, or ideas on what to look for in the output? I mean I am looking at the results and I don't really know what to look for....My Q(I) is only like 76 cfs and I am not getting any large Q outs from the Reservoir. I am also getting an error message regarding the Reservoir Volume Table vs. the Surface Area Table, saying that there are some discrepancies.

Thank you for your input into these matters.....

Stephen

Stephen Scissons, E.I.
Water Resources
BohannantHuston, Inc.
Courtyard I
7500 Jefferson St. NE
Albuquerque, NM 87109
voice (505).823.1000
fax (505).798.7988

Dear Stephen :

Note that DAMBRK runs really fast. I was having runs on the order of just a couple of seconds for your model. But, the UNET model runs were on the order of 40 minutes (when it converged).

When you run the model steady state, it is sometimes difficult to spot problems in the model since you really are not routing a hydrograph. And, since you are running it steady state with a low flow, it is possible that the dam is not failing--thereby causing you to see the small outflow from the reservoir structure.

Note that surface area is the preferred method of defining reservoir volume since the reservoir storage routing uses area in its computations, and the volume to surface area conversion algorithm used by DAMBRK does not always provide an adequate conversion. So, it is best to check the data that you have defined to see if there is a problem with your data.

Sincerely,

Chris E. Maeder, M.S., P.E.
Senior Technical Engineer
chris.maeder@bossintl.com