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Hello,

What does the volume of the paraeter Water Depth Represent.

For instance at if in case of a reservoir I calculate the volume (directly in BK) at time step T1 and then volume at Time step T2 would the change represent loss of volume storage?

Hi
The volume computed from the water depth represent the volume of water in your model.
The difference betwwen the volume at T1 and at T2 is then the loss or gain of water in your model.
You could also find this information in the listing of computation.
The initial and final volume are indicate in the listing and also the final error when you take in account the input and output.

Just keep in mind that the volume computation could be slightly false if you have partially dry elements...

Regards

Thank you so much!

So if this is the case then;

Volume at the end of Time step + sediment deposition volume = Volume at the start of time step

But this is not the case in my reservoir. For example

The volume of sediment at the end of the year is 8294676.94 m^3

while the difference in volume of reservoir = 56947 m^3

Should these two values not be the same?

Yes if you don't have any input and output of water in your model...
otherwise, you have to compare the water surface level to ensure that the volume of water is computed on the same basis.
I don't have any idea of the size of your model and the various parameter but imagine the final water level is just 1 cm below the initial water level, then the computation of water volume will be different...
regards

Thank you for your answer.

I am modelling a reservoir and the area is 73503249.95 m^2.

So if I need to see how much volume has been lost due to sedimentation should I then just subtract the sediment deposition volume from the initial water volume (manually) and not take into account the difference in initial and final water volume?

I'm not sure to well understand the value you list in your post so it could be clearer if you could attach your result file with only the first and the last time step.
You could also join the computation listing file.

Could you confirm us that there is no difference in the free surface level between the initial time step and the final one?

Thank you again for helping me.

The free surface is changing. I am attaching a screenshot of the logfile. I am trying to attach but I think the screeshot size is too big even in the compressed form.

I can email you if thats possible.

Size limit is 2 Mo.
If the screenshot overpass this limit, maybe you could try to just copy the text...

I have attached the file now