Row | Factor | High sediments |
1 | Surface geology | ・ sea Shale ・ gypsum and site content marls ・ the layers of stiff rocks and Shale ・ sandstones |
2 | Soils | ・ fine texture and highly dispersed, sore alkaline, high ability to expansion and compaction ・ granular silt and fine gravel ・ gravel ・ gravel texture-Lummi made of Granite |
3 | Weather | ・ raining for some days with short cycles of thunder ・ frequent heavy thunders ・ dry climate with heavy rain ・ runoff of snow melting |
4 | Runoff | ・ high rate of discharge in surface ・ high amount of water flow in surface ・ hydrologic soils of group D ・ hydrologic soils of group C |
5 | The unpaved areas | ・ deep slope areas more than 30% ・ high altitude, ups and downs ・ slope beds ・ flood resisting ups and downs |
6 | Limited plant coverage Lots of sediments | ・ land coverage less than 20% ・ dispersed plant coverage ・ the lack of pebble on the ground |
7 | Land usage | ・ more than 50% planted ・ the whole ground is like dispersed pasture ・ the plants recently burned ・ the recently cut jungle coverage ・ lots of road shears |
8 | High lands erosion | ・ erosion plough, gally and a mass in more than 50% of the lands ・ high amount of erosion |
9 | River erosion and sediment transportation | ・ frequent erosion at the river side ・ the erosion at the head and the decrease of their height |