How to Add Velocity Parameters in TOUGH3 Input file (.dat file)

Hello Everyone

Here I have attachted my TOUGH3 input file, I want to edit this input file by adding Velocity parameter in which TOUGH3 internally calculates it as output. 

If anyone know, please share the procedure with me.

As I am new in TOUGH3, manual instractions is quite dificult to me.

Thank you in advance for your time.