<span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">I have a regional model that with the assumed K of the formations and the calculated recharge (even if divided by half) <b>floods with heads of 8 km above the model top</b> (= topographic surface), for most part of the model area.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">So <b><u>I removed recharge</u></b> and put the model with the FEFLOW default K = 10 m/d in all the slices of the model (31 slices). But in spite of recharge (input through <u>In/Ourtflow on top/bottom</u> applied to slice 1) = 0 m3/d and Kxx = Kyy = Kzz = 10 m/d and the other flow parameters also as FEFLOW default, <b>the model still floods</b>, altough now head above topography values range from circa 1&nbsp; to 10 m. <b>It is not in the whole model area as before but it floods around the boundary conditions</b>.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">My boundary conditions are <u>hydraulic head = elevation</u>, are set in the 1st slice and represent the river network, once I have no data on river stages.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">My initial head = 0 m in the whole model and the lowest Elevation value in the 1st slice is = 0.6 m. So my initial head is always below the topographic elevation of the model top.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">The error tolerance is = 0.00005727</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">The model is defined as <u>Unconfined aquifer</u>, Slice 1 as Phreatic and the remaining ones as Dependent, <u>Storage change in phreatic top layer where water table exceeds the surface</u> as Extend storage of unconfined layer to the water table (once I assume there can be areas where flloding might occour, however not with the extension and location of the present floods in the model) and I set <u>Head limits for uncofined conditions</u> as Unconstrained on Top and Bottom of the model, once below my model area there are limestones which also are aquifers.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">The rate budget has an imbalance of around 2550 m3/d and the BCs have outflows of circa 6.182x10<sup>6</sup> and inflows of circa 6.1824x10<sup>6</sup>.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">I also made an attempt with <u>Head limits for uncofined conditions</u> as Constrained head on Top of model domain (and recharge =&nbsp; 0) but <b>the model sitll flooded around the boundary conditions</b>.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">By the way, I also tried to change the K values, setting the whole model at Kx = Ky = Kz = 100 m/d and in another simulation at 1 m/d. The <b>flood occured in the same areas as when Kx = Ky = Kz = 10 m/d</b>, what changed where the values in the rate budget. Awhen there was K = 100 m/d these where 10 times larger that when K = 10 m/d and when K = 1 m/d where 10 times smaller as when K = 10 m/d.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">I also tried to use Seepage face but the flloding problem remained.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">All these simulations – except the initial one with the “real” K and recharge – were performed with recharge = 0.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">From all this I suspect that there is too much water entering the model through the boundary conditions. So I tried to set up constraints. However when I select the nodes with the BCs I want to constrain, then click on Hydraulic head BC in the Data panel, and click&nbsp; on Add paramenter and choose for instance max. flow-rate constraint in the window</span></span></span><br> <img 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"><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">&nbsp;there is no indication of a flow rate but only a head value that I can change. So I cannot define the flow rate. I’ve checked with the Inspection after entering a value in this above window and there is no constraint defined.</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">So, how can I define this flow rate?</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">And is it realy that my problem stems from the fact that there are no constraints in the BCs or is there something else?</span></span></span><br> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:&quot;Calibri&quot;,sans-serif">One last question: when FEFLOW finds that the error is below the error tolerance and ends the simulation, this error below the errro tolerance is the average of errors in all the nodes between one simulation and the next one or is the highest error between simulations in at least one node of the model?</span></span></span><br> &nbsp;