Development of new submodule and add-on

It is to essential work for inserting a new algorithm associated with fate and transport of pollutants, modifying algorithms, and integration of algorithms. In general, when we use a package model such as SWAT, HSPF, CE-QUAL-W2, EFDC, QUAL2E, etc, we do not handle internal algorithms in models but build external components of models and do simulation. So we can improve the package model’s performance as a developer point of view.