the role of unit hydrograph is very important in prediction of floods in the rivers, design protection and control structures in the catchment area. therefore in the basin without hydrometric stations, by using mathematical and empirical relationship and based on climatic data, the water level in the basin is estimated. two methods of geomorphologic instantaneous unit hydrograph and width funct...

introduction: the frequency of floods is one of the characteristics of river flow statistics so thatanalyzing it has an important role to assess the hydrological and economical water resources projects. for determining flood frequency, the estimation of accurate skewness coefficient of annual peak discharges is required. estimation of population skew for different regions will be improved when ...

Human activities have profoundly changed the hydrological regime and trends of rivers lakes, which, in turn, has affected utilization their navigable conditions. However, few studies focused on effects changes regimes lakes Thus, this study intensively analyzes investigates depth at major control sections lake area during dry season period before 2002, when Three Gorges Reservoir was not yet co...

there are different materials and compounds in water that determine its chemical and physical quality. as the result of special conditions such as increase and decrease in discharge, water quality can vary. one of these conditions is drought that decreases discharge, and water quality changes. in this study, droughts of sistan and baluchistan province have been analyzed using standardized preci...

Abstract A variety of methods, including both modeling and non-modeling water balance techniques, are used in this study to estimate availability allocated for different demands. The area under investigation is the shared Diyala River basin between Iraq Iran, which vulnerable climate change impact upstream control aims enhance watershed management. Two rainfall-runoff models were applied, Tanh ...