--> //initializations

--> e1=0.7 // (void ratio of first soil)
 e1  = 

   0.7


--> k1=4/10000 //cm/sec (coefficient of permeability at a void ratio of 0.7)
 k1  = 

   0.0004


--> e2=0.5 // (void ratio of second soil)
 e2  = 

   0.5


--> //calculations

--> k2=(k1*(1+e1)*(e2^3))/((1+e2)*(e1^3)) //(coefficient of permeability at a void ratio of 0.5)
 k2  = 

   0.0001652


--> //results

--> printf('coefficient of permeability at a void ratio of 0.5=%f',k2) //cm/sec
coefficient of permeability at a void ratio of 0.5=0.000165