Initial Conditions

The initial concentration in the unsaturated zone is given as average concen­trations. The unit for the concentration is [mass/volume]. This way of giving the initial conditions has the advantage that you does not have to worry about the vertical discretisation and the water content. On the other hand, you do not know the exact amount of mass introduced into the unsaturated zone, since this depends on the initial water content determined in the water move­ment simulation.