This book explains about hydrological modeling and low flow analysis of river catchments. Besides explaining essential topics like meteorological and hydrological data management, it provides detailed description of linear and conceptual rainfall-runoff models calibrated and verified with GFFS software. The book illustrates how to test performance of models and the way how to select the best candidate model for the catchment response prediction. Development of Flow Duration Curve (FDC) and derivation of dependable flows at the gauged sites for the estimation of low flows for different water resources projects (like irrigation) at ungauged locations of the catchment has also been explained in detail in this book. In this regard,flow transferring techniques have discussed more. All these features make this book an indispensable for water resources and civil engineering students and experts. Others who are related professionals would also find it extremely useful.