The Time Series Icons layer is created for the Acquisition, Visualization, and Setup modules when a CWMS watershed is created. Initially, this layer is blank, but as you create time series icons layers, the layer includes all of the time series icons that you have defined for your watershed. Time series icons are initially available in the Acquisition, Visualization, and Setup modules, and once forecast alternatives and forecasts have been created then the Time Series Icons layer will display in the Modeling module.