mingo80

Hello

I want to find out an answer about pumping rate input and simulated output (4 well BC) of FeFlow simulation on "Phreatic" aquifer type setting. There are several aquifers have been set as "Phreatic" (As the conceputal model needs). We have a reasonable calibration, however, the input pumping volume (pumping rate) is not always equal the simulated output, there is offset for each year. for example, 1st year observed (input) pumping value is 4Gl, Model simulated is 4.2 or 3.7Gl.

After several testing, I am wondering if that is water balance bugs? Any suggestion to deal with that offset? Is the model able to produce the exact (100%) same input and output value? As for the dewatering prediction model, those offset is an issue.

Cheers

Actually, I went to help alot, there is no specific indication to say where I can find "draws" and export water budget ".txt"  All I saw on help is:

The budget parameter is used for visualization of boundary heat flows in the view windows. Adding budget to a FE-slice view or 3D view draws the nodal boundary flows as scaled and colored spheres. Drawing requires that the budget calculation in the Budget panel is set to Active and that FEFLOW is in simulation mode or a full results file (*.dac) is loaded.

Via the context menu of the parameter the budget values can be exported on a nodal basis.

Please explain more detail. Thanks

hi,

I am not familiar with FeFlow 6.1. Please let me know how to use polygon or at the respective nodes or  import specific shp file to check the water budget for 4th and 1st kind BC?
where I can find select area like in FeFlow 5.4 to output the water balance. (export .txt water budget file from certain period).

Thanks for the help.

Hi

I want set up a dewatering with 4th well bc model.not allow to use 1st BC. It requires no recharge ( in/out) flow in the model, storage compressibility for each slice is very low. Any suggestion which technique should apply to lower the water level regionally. Currently the abstraction rate is large, the water still not drop down. The water contour shows bull eye around pumping well area.

Ps: multiple well was applied, constraint with proper elevation already.

Thanks

Hi there

Currently there are about 50 mutiple-layer pumping wells over the model domain, there are different screen depth, am trying to constraint to each slices with the bottom of well elevation. The model result gives me each year abstraction is only half as the abstraction was input to the model. and water level contour shows the water level not drop to the bottom of well elevations. I understand FeFlow as a "free-moveable" layers, supposed to be constraint each layer with min (bottom of wells elevation). however, the water level is not reach the elevation, abstraction each year is only half as input to the model?

Any suggestion to solve this?

Thanks

Out of interest, am wondering if the model has meaning run without 1st BC, just use 4th well BC, dewatering and constraint with multiple-layer wells. Thanks

Thanks!

Hi there

I am wondering when setting the "temporal & Control data" there is "Automatic time step control via
Initial time step length"; if I put 0.001 day final time" 3600 days"  OR I choose "constant time steps: which number of tme step is 120, length of time is "30days".

Does either option for running model both accuracy acceptable? Thanks

hi there

Does PEST could work with Feflow 6.0 OR 5.4 for the automatically steady-state calibration? just heard, actually no any clue how to do that. Anybody out there would like to help with this?

Thanks!

:P :)

Anyone there help please!

While I'm loading newly generated fem, the log message shows up" Warning math: argument domain error in fuction acos!"

I tired to smooth mesh file then, the warning message is gone, however, I've notice all the faults, river  in mesh is not in right place any more after smotthing the mesh. (as there are lots of faults, river need to be noded), this message doesn't show always, sometimes it's disappeared when loaded again; sumtimes it's on!
"totally depends on feflow mood" :-\"



How can I get rid off this warning math message! it would never show up again!