Posted Sat, 05 Jul 2014 06:21:55 GMT by Perl Shaw
I have River on one side of my model area while an irrigation canal on other side.

Which Boundary Conditions are represented by Rivers and Canal in this case?
Posted Tue, 08 Jul 2014 09:08:58 GMT by Björn Kaiser
There are several types of Boundary Conditions (BC’s) you may use depending on (1) the problem you want to investigate and depending on (2) available data. Here is a rather general answer: If you use a fixed potential (1st kind BC) you ad-hoc impose the solution (heads) along the surface waters. Instead if you use a 3rd kind BC you rather use a reference head href, which refers to the surface water head. Then FEFLOW solves for the GW-head h. Depending whether h is smaller/larger than href you have in inflow/outflow by taking the transfer rate Phi into account: q = -Phi (href-h).

Please find more details in the FEFLOW book, Chapter 6, page 193.

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