The purpose of this book is to show the method of identifying flood prone area in un-gauged watershed using integration of RS and Hydraulic models aiming in providing a decision tool to the different stakeholders and decision makers to decrease the impact of possible flood events and provide early warning. This book includes five parts: part 1 - Introduction of the research work; part 2 - Describes the study area, topographic information, Argo-ecology, Drainage, Geology, soil characteristics, climate, data required and source and data collected and Analysis; part 3 - Result and discussion, in which the results of designed rainfall analysis using SMADA software, designed-runoff modeling using SCS CN, flood inundation modeling using HEC-RAS model are discussed in detail; part 4 - Conclusion based on the analysis of designed rainfall data, designed-runoff modeling and flood inundation modeling; and part 5 - References.