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            Figure 5. Pumping test: (a) convergence of the numerical flowrate. (b) numerical error.
          
        
        
          
            Figure 6. Pumping test: convergence of the hydraulic
          
        
        
          
            head at r = 20.15 m.
          
        
        
          
            Figure 7. Numerical convergence for the pumped flow
          
        
        
          
            rate with two meshing methods, one with equal size, the
          
        
        
          
            other with progressive meshing.