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Groundwater, Dewatering
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Hi Daniele Do you know why the calculated radius of influence with the Sichardt formula is much smaller than the radius of influence from the model? which answer is correct ? Thanks for any help.
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Dear all, I do appreciate if you can help me with this problem: I had a square area with 4 cutoff walls around it. and some wells are going to be inside the area to dry it. first I modeled a cross section in Seep2D to see how the wells dry the area. I attached a picture of results. the results looks fine. but I wonder why when I model it in Modflow, as 3D model, the seepage (vertical gradient) is not as continuous as it was in SEEP2D . I attached image here. it sounds like any cell in one aquifer layer has almost the same head pressure along its depth!!! so should I divide my aquifer to mult
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Thank you Sean. sounds like I need to know lots of details to get it work. - can I define drain for those arcs to let them have flow out of my domain if it's necessary. - how people model an area? they always are aware of all boundary around their farm/ field/ wells/ etc? is there any source I can see multiple type of fields modeled in Mod-flow?
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Thank you, I will try that as well. I am new in this modelling and face a lot of question for such an example.
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Dear all I have trouble modeling a square site with different BC. at one side I have river (I put constant head as BC) and no problem in that for modeling. now, 1) at one side I have rock (no flow coming in or out from site at this side) and 2) at other side of square area I have no BC (I mean the water can flow out of area etc) what is the difference in modeling number 1 and 2? how to difine them in my model? my model currently have active cells in coverage so I think it means all sides I have rock, right? Thank you, Zara
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I tried decreasing k for silt to the value 0.0003 runing the model gives no error but it makes both tope layer dry and flow budget is almost zero!!! results sounds too wierd so I think that counts as the model error when I set high discharge for low K . I will try transient model for first parameter to see how it respond. Thank you for helping me.
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I don't find image uploading here. here is the image on internet: http://www.freeimagehosting.net/dmx4l http://www.freeimagehosting.net/abzdt http://www.freeimagehosting.net/wvbrk
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layer 1 is clay, from +25ft to -19ft, k= 0003 ft/min layer 2 is silt, from -19ft to -83ft, k= 0.003 ft/min. layer 3 is sand from -83ft to -175ft, k= 0.012 ft/min. at 1000ft distance from the job site (which is 100*100ft square area) I defined constant head =20ft all around in layer 3 ( means preimeter of 1100*1100 square ) my goal at first was to see how much dewatering and how many wells I need to make the first layer dry for my excavation area. here I defined 43 MNW in layer 2 with desired discharge 12GPM/well !!! (which is impractical) results shows layer 1 at the middle is dry, layer tw
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actually in my LPF package, all the layer are mentioned convertible. I made my model getting help from Tutorial:"MODFLOW- Conceptual model approach". Thank you guys for helping me. I wish I could post an image of the results here.
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as an example here I have about 40 well in two top layer with discharge of 12GPM/well which means about 480 GPM !!! I know from silt layer it's not possible to get that much water, but my model adjust itself for every discharge I define and give me high drawdown instead.
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Thanks for replyin. I have a layer of clay with .0003 ft/min and silt with 0.003 ft/min. there is one layer sand underneath with 0.012 ft/min. at 1000ft distance I have constant head at all direction. those are the only BC I have.
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Dear all I am new with GMS. and have trouble modeling multiple pumping well to see the total drawdown. I have three layer of clay, silt and sand. I wanna see how much water I should pump and from which layer to get certain drawdown. so I worked backward. giving discharge I checked the result drawdown. I am interested to use wellpoint system in the silt layer (instead of deep well in sand layer) now the question is, why in modflow I can assign any discharge to the well? I expected MODFLOW to give error saying because of low pearmiability this much discharge is not possible to be taken from cla