DAMBRK modeling results, reliable values?

Sir,

Thank you so much for so kind to me. Here I am sending you the input file "Mnklm2.dbk" as an attached file.

I am adding some of the specific doubts. Kindly reply if it genuine.

1. The reservoir depletion table in output file gives quite anomalous figures in the column "Total out flow from dam". Is it correct?
2. In "Initial conditions" in the output file, what is the difference between Normal flow water elevation and critical flow water elevation?
3. In the "Flood crest summary table", the columns time to flood elevation and flood wave arrival time does not show reliable values

(I am asking doubts regarding the output file because no explanations are given about its contents)

Hope I can better understand the mistakes I made after your evaluation of the model.

Once again thanking you

Abin Philip
SPF, ESD, CESS
INDIA

Dear Abin Philip :

I reviewed your model. Here is what I believe is happening to your model.

You have defined the dam so that the dam is immediately failing at time = 0.0. Also, you have defined an inflow hydrograph that peaks at time = 24.0. Therefore, the reservoir depletion table is showing a large flow for the "Total out flow from dam" at the start of the simulation, which then falls off, and then increases again in conjunction with the defined inflow hydrograph.

I would recommend running the model with the water surface elevation at time of failure to being a very high value to determine what the maximum WSEL (water surface elevation) is reached at the dam. You can then set the water surface elevation at time of failure value to something slightly less than the maximum value that is reached to cause the dam to fail in conjunction with the peak WSEL.

I believe if you make these corrections to your model, that the output results will seem more reasonable.

Also, note that "normal depth" is the actual computed WSEL, whereas the "critical depth" is computed by DAMBRK for your reference.

Sincerely,

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