--> //initializations

--> R=300 //m (radius of influence)
 R  = 

   300.


--> k=3*10^-4 //m/sec (coefficient of permeability)
 k  = 

   0.0003


--> q=0.05 //m^3/sec (discharge)
 q  = 

   0.05


--> t=25 //m (thickness of confined aquifer)
 t  = 

   25.


--> d=10 //m (depression head)
 d  = 

   10.


--> //calculations

--> x=(2*%pi*k*t*d)/q 
 x  = 

   9.424778


--> rw=R/(exp(x)) //(radius of the well)
 rw  = 

   0.0242099


--> D=rw*2 //(diameter of the tube well)
 D  = 

   0.0484197


--> //results

--> printf('radius of the tube well=%f',rw) //m
radius of the tube well=0.024210
--> printf('diameter of the tube well=%f',D) //m
diameter of the tube well=0.048420
