Mahsa Mirdashtvan - M.Sc. student, Department of Arid and Mountainous Reclamation University of Tehran.
Sadat Feiznia - Professor, Department of Arid and Mountainous Reclamation, University of Tehran

Determining the permeability and the potential of runoff creation by geological formations inorder to estimate the risk of flooding in watershed for construction of engineering structures isimportant to prevent flooding and soil loss. Due to the high importance of flooding parameter insoil conservation and erosion prevention so the relative control of this matter has an importantrole in integrated watershed management. The purpose of this study is investigation theflooding situation of Artun watershed, according to the geological condition of the watershed.Artun watershed is one of the southward sub-watershed of Taleqan basin which is located inAlborz province. On the basis of this, the geological map of the basin was prepared and the typeof stones, existed formations and their area were specified. The formation permeability mapswere prepared using geological maps and finally based on the permeability or infiltration,watershed flooding map was obtained. According to this matter that the northern part of basinconsists of EKV lithological units, being resistant against erosion is the positive point in termsof biology, however the high flooding is its weakness. In the central and southern parts of thebasin gy1 and Ngm units are seen that both units are impermeable and highly fertile to flood.The units of the Quaternary formations are located in sectors of the basin with highpermeability of the flood that have lowered the flood fertility of its surrounding areas. Due tothe large percentage of the area has assigned to the units which are sensitive to erosion and havehigh permeability, so designing and carrying out corrective measures are necessary to protect it.

Flooding; Permeability; Geological formations; Artun watershed