Semi-quantitative Approach

Soil erosion risk in the Gina River catchment assessed after a semi-quantitative approach; adapted from Beck et al. 2004.

A semi-quantitative approach was developed to estimate soil erosion risk in the Gina River catchment. As major factors determining soil erosion processes the following factors were considered

  • land use including paths and settlements;
  • soil conservation measures;
  • slope.

Further relevant factors were not considered:

  • soil characters – as intensity of field investigation of the Gina River catchment does not allow a significant differentiation in the spatial distribution of soil textures.
  • precipitation – as detailed precipitation data are lacking for the watershed.

The factors selected are weighted qualitatively and put into erodibility classes - thus, semi-quantitative. These were combined in a soil erosion risk equation. A resulting map shows the spatial differentiation of soil erosion risk in the Gina River catchment (see figure).

See the results of the qualitative approach to assess soil erosion risk in the Gina River catchment next.