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Re: [gwmodel] Island modeling

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  • jalal mirnezami
    Hi Patrick, Your explanation was very useful, it seems simple but really practical for these unknown situations. Regards On Tue, Feb 1, 2011 at 1:24 AM,
    Message 1 of 9 , Feb 1, 2011
      Hi Patrick,

      Your explanation was very useful, it seems simple but really practical for
      these unknown situations.

      Regards


      On Tue, Feb 1, 2011 at 1:24 AM, Patrick Delaney <patrickgdelaney@...
      > wrote:

      >
      >
      > Pete is correct, this is exactly what I was alluding to. Of course, this is
      > a generalization because I don't know anything about the subsurface
      > characterisation of the island hydrogeology or surface hydrology, but in
      > general, with simple unconfined systems, it is possible to use large K and R
      > or small K and R to achieve similar result water levels in the system. The
      > reason this is important to recognize is because it can influence
      > dramatically different results when you are evaluating the potential
      > sustainable yield of the aquifer. Using low K and R would give you a very
      > conservative estimate of how much water you can extract, while using a large
      > K and R would give you a very optimistic estimate of how much water you can
      > extract.
      >
      > Hope this helps.
      >
      > Patrick Delaney
      >
      >
      > To: gwmodel@yahoogroups.com <gwmodel%40yahoogroups.com>
      > From: psinton@... <psinton%40aquageo.us>
      > Date: Fri, 28 Jan 2011 08:37:25 -0700
      > Subject: Re: [gwmodel] Island modeling
      >
      >
      > Without much data, it is possible to use large K and large R or small K
      > and small R, and achieve equally good match to your limited data
      >
      > *Pete Sinton*
      >
      > www.aquageo.us
      >
      > On 1/28/2011 3:05 AM, jalal mirnezami wrote:
      > >
      > > Thank you Patrick, your guidance was really great
      > >
      > > But now with your guidance some new questions have come to my mind. From
      > > your answer I got that in a steady state situation, the rulling
      > parameters
      > > are R and K, and also the results taken from model runs will be limited
      > by
      > > their (R and K) values. Ok, thats right, but what did you mean by this
      > > part
      > > : "then you will be able to modify the recharge and hydraulic
      > conductivity
      > > values within pretty large ranges of reasonable values and still acheive
      > a
      > > pretty decent calibration "
      > > let me tel you what I got through your words. you mean, by changing R
      > > and K
      > > values I can calibrate the model? Is it right?
      > >
      > > Again thanks for your help, and sorry for taking your time
      > >
      > > J.Mn.
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