The third and final part of the model, shown in Figure 3,
stores the results of the model iteration. The stream network is
added to the original Study Zero raster, with values of zero. This
raster is copied and from the results a feedback loop is created. If
the model runs multiple times (using iteration), the streams from
the first run will be stored, and during the second run the second
stream result will be added to the first. This makes it possible to
store the results of multiple iterations.