ABSTRACT. Sub-basins prioritization is one of the most important resolutions of development sustainability and natural resources comprehended management. In this study, 11 sub-basins of Lohender in east Golstan province about 272/63cm Prioritized using computation and morphometric analysis and using GIS and RS techniques. Erosion mode in each sub-basin specified through Sediment Yield Index approximation. In morphometric analysis, parameters like canal length, bifurcation ratio, discharge density, sub-basins shape coefficient, round coefficient, stretch coefficient and compressive coefficients were computed thus these parameters divided to two classifications: linear coefficients and figurative coefficient. In order to study annual sediment index, from fields applied maps, land coverage, slope, soil type and topographic map scale 1:50000 were used. Finally, each sub-basin Priority determined due to Sediment Yield Index (SYI) and total average of morphometric parameters. According to morphometric parameters, the BS sub-basin and according to SYI parameter, A5 sub-basin showed more critical mode and combination of both showed that B2 sub-basin showed the worst situation.

Sub-basins prioritization is one of the most important resolutions of development sustainability and natural resources comprehended management. In this study, 11 sub-basins of Lohender in east Golstan province about 272/63cm Prioritized using computation and morphometric analysis and using GIS and RS techniques. Erosion mode in each sub-basin specified through Sediment Yield Index approximation. In morphometric analysis, parameters like canal length, bifurcation ratio, discharge density, sub-basins shape coefficient, round coefficient, stretch coefficient and compressive coefficients were computed thus these parameters divided to two classifications: linear coefficients and figurative coefficient. In order to study annual sediment index, from fields applied maps, land coverage, slope, soil type and topographic map scale 1:50000 were used. Finally, each sub-basin Priority determined due to Sediment Yield Index (SYI) and total average of morphometric parameters. According to morphometric parameters, the BS sub-basin and according to SYI parameter, A5 sub-basin showed more critical mode and combination of both showed that B2 sub-basin showed the worst situation.

ABSTRACT. In many parts of the world, especially in arid and semi-arid, one of the solutions to deal with the major flood season comes, is the dam, as well as water storage dams to store flood also reduced the flood peak flow and damages resulting from it. It must be built in places that best performance in terms of the volume of the reservoir and reduce their discharge. In this paper, using a combination of linear and GIS environment, the proportion of land for the construction of small earth dams in the watershed Kal Ajy in the East province with an area of 170.90 km, based on five criteria (slope of the stream bed, the distance from the village, away from sources of credit, apart from agricultural lands, areas with severe erosion) to assess and map the proportion of the land in the study area was prepared. This map priority areas for the construction of small dams and earthen offers. The results indicate that 27 percent of the region is important for small earth dams are suitable.

In many parts of the world, especially in arid and semi-arid, one of the solutions to deal with the major flood season comes, is the dam, as well as water storage dams to store flood also reduced the flood peak flow and damages resulting from it. It must be built in places that best performance in terms of the volume of the reservoir and reduce their discharge. In this paper, using a combination of linear and GIS environment, the proportion of land for the construction of small earth dams in the watershed Kal Ajy in the East province with an area of 170.90 km, based on five criteria (slope of the stream bed, the distance from the village, away from sources of credit, apart from agricultural lands, areas with severe erosion) to assess and map the proportion of the land in the study area was prepared. This map priority areas for the construction of small dams and earthen offers. The results indicate that 27 percent of the region is important for small earth dams are suitable.