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<p class="MsoNormal"><span lang="EN-US">Dear colleagues,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am using r.gwflow with this sentence:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">r.gwflow phead=Npi status=St hc_x=K hc_y=K s=S q=q top=Techo bottom=Muro type=unconfined dt=2592000 output=npf velocity=vel r=rec solver=cg maxit=100000 error=0.0000001 relax=.9 -s --q --o<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The initial phead (Npi) is under the top (Techo), but the final phead (npf) overpasses the top of the aquifer in some cells. I guess that is the reason why some warnings appear in the screen, until a last message: WARNING:
Matrix is not symmetric!.<o:p></o:p></span></p>
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<span lang="EN-US">WARNING: Matrix unsymmetric: Position [96][86] : [86][96]<o:p></o:p></span></p>
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<span lang="EN-US"> Error: -0.023767764282226562 != -0.016727489413544162<o:p></o:p></span></p>
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<span lang="EN-US"> difference = 0.007040274868682399<o:p></o:p></span></p>
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<span lang="EN-US"> Stop symmetry calculation.<o:p></o:p></span></p>
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<span lang="EN-US">WARNING: Matrix unsymmetric: Position [97][96] : [96][97]<o:p></o:p></span></p>
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<span lang="EN-US"> Error: -0.014451045405668651 != -0.016446109008789060<o:p></o:p></span></p>
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<span lang="EN-US"> difference = 0.001995063603120410<o:p></o:p></span></p>
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<span lang="EN-US"> Stop symmetry calculation.<o:p></o:p></span></p>
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<span lang="EN-US">WARNING: Matrix is not symmetric!<o:p></o:p></span></p>
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<span lang="EN-US">[Raster MASK present]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"><span lang="EN-US">GRASS 6.4.2svn (ESPPOR):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The program provides an output with the head level. Can we trust that level although the matrix is not symmetric?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for your help<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Luis Barranco<o:p></o:p></span></p>
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