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The Sediment yield potential estimation of Kashmar urban watershed using MPSIAC model in the GIS framework
Results and discussion : With due attention to the studies and surveying of this watershed, the main reason of erosion in the lower parts of this basin is overgrazing . Thus with applying the reformatory programs, exclosuring and grazing management, and considering the basin formation, is not sensitive to erosion , we can decrease the basin erosion .After providing sediment yield map, we saw in the rocky regions in spite of low sensivity of these regions to erosion, in some places the amount of sediment yield is high whereas with due attention to the existing witnesses, these regions should have low sediment yield . The reason of this problem is high effect of slope and land use factors on the amount of sediment yield . To adjucement the sediment yield in these places,we used a mean filter(size:100* 100) on the sediment yield map and we adjusted the value of land use factor and at last by dividing the new sediment yield map by the previous sediment yield map, correction factor was obtained 0.92 .In this basin considering the higher part of basin is rocky only mechanical erosion form was saw .In the lower part of this basin, was saw light rill and surface erosion form . In this study to increasing the precision of maps overlaying, more speed in the operation, to prevent increasing of files volume and working with data tables of the maps databases, seven factor (X1 , X2 , X3, X6 , X7 , X8 , X9 ) of nine factor of PSIAC model, were overlayed vectorical .In the rasteric mode to decreasing of files volume , best speed and precision, a best size (5*5) for pixels was defined . with due attention to the obtained results and studied basin conditions, obtained sediment has good accuracy . Acknowledgement : The author thanks Mr . Ali Ershadi, the expert of Kavosh Pey company, since in this study was used form his guidances  
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