Determination of Erosion Severity Using Fargas and BLM Models Case: Bandre Drainage Basin

Erosion is a process in which soil particles separate from their main bed and move to the other place with the help of a transferor operator where based on the type of transferor operator there will be water, wind and glacier erosion (Refahi, 2000, p.3). Nowadays we rarely can find a region in the ground that is not subjected to the erosion and destruction which the main reason is the population growth and the excessive use of land (Ahmadi, 1999, p.195). Also it is considerable that erosion has two important aspects which include the reduction of the land productivity power and the disturbance of eroded materials (Ghadiri, 1993, p: 3-6). Therefore, the compensation of eroded soil for the nature, especially in the arid regions that the condition is so inadequate for formation of soil, is so hard and long process. So, the residents of these regions must be so careful in the preservation and prevention of erosion, because erosion is naturally so intense in these regions and the possibility of soil forming is so low (Kardovani, 1998, p.7). Thus the recognition of the sensitive regions to the erosion and sedimentation in the various parts of a drainage basin is one of the most critical issues in the prioritizing of the regions for executive works of soil preservation and watershed management.