In HEC-RTS, you setup a watershed to reflect a collection of data, information, application models and images that represent a watershed and water control features within a watershed. The basic setup of your HEC-RTS study is done in the Setup module (Figure 1) of HEC-RTS. You will setup items that describe a watershed's physical arrangement. When you create a new watershed, a directory structure is generated where all files associated with the watershed are stored.

Once you have created a new watershed, you are able to import maps from external sources, specify the unit system and time zone for the watershed, add layers containing additional information about the watershed such as streams.
This chapter will discuss the main items that you will be doing in the Setup module: create watersheds; define the computing sequence for forecast runs; create time series icons; create time series layers; import and define keys for model alternatives; create forecast runs; setup the model linking between model alternatives in a forecast run; and, manage extract and post groups. For further details, refer to Setup Module.