matevz Posted July 28, 2008 Report Share Posted July 28, 2008 Hi, does anyone knoe why there is so much difference between model computation and a calculation via some empirical equations? For example, i calculated the amount of water that has to be pumped out of several wells in a raster (using the 3,6 drawdown and k=6*10-3m/s) with this formula : Q=k*(H^2-h^2)/(0.733*log(R/re)) where re - is the ekvivalent radius of the area where water needs to be lowered R - is radious of influence H - 15m h - 11.4 The result with this equation is Q = 357 L/s When I use same numbers in model i get Q = 1.4 m^3/s (1400 L/s)? I know the model uses more parameters and the numbers shouldnt be the same completely but this is more that 300% increase! Does anyone has any idea? Thanky, matevz Quote Link to comment Share on other sites More sharing options...

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