--> //initializations

--> km=0.12 //(coefficient)
 km  = 

   0.12


--> H=8.0 //m (cover)
 H  = 

   8.


--> Bd=1.0 //m (width)
 Bd  = 

   1.


--> Y=19 //KN/m^3 (unit weight)
 Y  = 

   19.


--> //calculations

--> x=(2*km*H)/Bd
 x  = 

   1.92


--> Cd=(1-exp(-x))/(2*km) //(load coefficient for ditch conduits)
 Cd  = 

   3.5558043


--> Wc=Cd*Y*(Bd^2) //(load on the sewer)
 Wc  = 

   67.560282


--> //results

--> printf('load on the sewer=%f',Wc) //KN/m
load on the sewer=67.560282
--> printf('NOTE: calculated value in book is different because in book value of Cd is considered 3.6 but in code its 3.5558043 ')
NOTE: calculated value in book is different because in book value of Cd is considered 3.6 but in code its 3.5558043 
