3.2. Boundary and initial conditions

Contaminants may be released into a water system via one of two modes: constant release or pulsed release. For both, the initial condition is C xð Þ¼ ; t ¼ 0 C0, where C<sup>0</sup> is the initial concentration that can be assigned as a constant such as the background concentration. The boundary condition for the free surface, bottom and side surfaces is the no flux condition, <sup>∂</sup><sup>C</sup> <sup>∂</sup><sup>n</sup> <sup>¼</sup> 0, where n represents the coordinates in the direction normal to the boundary. Other observed concentrations are assigned to the inflow and outflow boundaries.
