Row | Factor | Low sediments |
1 | Surface geology | ・ stiff and compacted formations ・ dolomites ・ huge alluvial layers |
2 | Soils | ・ containing high percentage of boulder ・ stiff textured clay ・ containing high organic substances |
3 | Weather | ・ wet climate and rainfalls with low intensity ・ mostly snowfall ・ freezing and melting ・ dry climate |
4 | Runoff | ・ low amount of maximum discharge in surface ・ low amount of runoff in surface ・ unique surface runoff ・ hydrologic soils of group A |
5 | The unpaved areas | ・ Slow slope areas less than 5% ・ expanded alluvial plain |
6 | Limited plant coverage Lots of sediments | ・ ground coverage less than 40% ・ remarkable plant traces ・ dispersed trees |
7 | Land usage | ・ the ground surface completely covered by plants, more than 70% traces of plant and boulders ・ low permeability of rain into erodible materials |
8 | High lands erosion | ・ the absence of erosion signs ・ low erosion |
9 | River erosion and sediment transportation | ・ wide and low deep with flat slope of streams ・ river bed on huge rock masses with boulders or with good plant coverage on the surfaces ・ controlled streams |