a. nohegar

The aim of this study was to evaluate the extent of development and recognition of the hydrochemical behavior of karst aquifers of Bistoon and Dalahoo limestone masses using graphical methods, clustering, factor analysis and saturation indices. The results of hydrochemical methods indicate that the dissolution process is active in the karst aquifers of the studied masses. These methods have acceptable efficiency in determining the origin of karst water, effective factors in quality characteristics, water retention in the aquifer and evaluation of the development of the internal network of karst systems of the studied masses., Shah Hossein, Sarableh, Varmanjeh and Mirahmad springs in Bistoon mass and Rijab and Marab springs in Dalahoo mass were identified as springs with internal karst development. The Bistoon Mass Formation due to its size and integrity, thickness and pure mineralogical composition, has much more karst formation capacity than the Dalahu Mass and plays a key role in the formation and development of the Biston Massif karst geomorphology.

The examination of control methods and estimating of damage caused by flood inorder to collect partical methods to preserve national is of importance.yearly, someparts of construction and buildings located in lower part of storage Dams of thecountry are damaged by seasonal overflowing and letting of currents which and morethan the capacity of the river.If we want to consider flood management as crisismanagement, we have to manage floods yearly.Even when we are in crisis conditionswe have to plan wisely and yearly and schedual for coming days too. In and arid arealike Minab the most important thing making balance between the supply and demandof water.Considering natunal characteristics of mentioned area, usual supply of wateris limited,on theother hand demand value of water is growing due to increasingpopulation the increasment of cultivated lands, industry development,urbanlife and act.Therefor,planning to use of water resurces of the area is of high importance.one of thebasic considering water management is flood management.In this kind of managementthere are different methods so that we can control and prevent flood damages that canbe defined by structure and nonstructure.Since the Minab river is dilluvial and its bankis unstable through weakend sediments deficiency of suspend load caused bystablishing of the Minab Dam,steepy slope of the river,specially parts located betweenthe Minab Dam and the Minab Bridge,are all factors causing overflowing quicklyconcentrated turned into dangerous floods which fluvial systems overwhelm area areknown as greatest natunal phenomenon.The maximum value of debi of the Minab riverdates back to years 1976-77,78-79and 1991-92.The examination of statistical data offlood in different station such as Brentin,most floods were seen in winter season andsome 93 percent from them were between the months of Azar and Farvardin.Hydrulic which is produced by depth, width and current,has got relation withfeatures such as the extent of immersed area and sediment load which flourishing andqualification management actions performed on it is impossible without considering it.