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<br />Chapter I Introduction <br /> <br />CHAPTER 1 <br /> <br />Introduction <br /> <br />Welcome to the Hydrologic Engineering Center's River Analysis System <br />(HEC-RAS). This software allows you to perform one-dimensional steady <br />flow, unsteady flow, and sediment transport calculations (The current version <br />ofHEC-RAS can only perform steady flow calculations. Unsteady flow and <br />sediment transport will be added in future versions). <br /> <br />The HEC-RAS modeling system was developed as a part of the Hydrologic <br />Engineering Center's "Next Generation" (NexGen) of hydrologic engineering <br />software. The NexGen project encompasses several aspects of hydrologic <br />engineering, including: rainfall-runoff analysis; river hydraulics; reservoir <br />system simulation; flood damage analysis; and real-time river forecasting for <br />reservoir operations. <br /> <br />This chapter discusses the general philosophy of HEC-RAS and gives you a <br />brief overview of the capabilities of the modeling system. Documentation <br />for HEC-RAS is discussed, as well as an overview of this manual. <br /> <br />Contents <br /> <br />. General Philosophy of the Modeling System <br /> <br />. Overview of Program Capabilities <br /> <br />. HEC-RAS Documentation <br /> <br />. Overview of This Manual <br /> <br />1-1 <br />