4.3 Numerical Solution Procedure for the General Case

In the general case of multiple, concurrent, contaminant loss routes, an analytical solution to Equation 4.4 is not always possible.  The reasons for this are similar to those discussed for the contaminated aquifer source zone (e.g., complex NAPL partitioning theory, time-varying parameters).  The numerical solution algorithm is identical to that described in Section 3.3 (for the contaminated aquifer), so the reader is referred there for details.