The DSS file "split.dss" contains only the input for an unsteady HecRAS analysis. Below is a screenshot of the main HecDSSVue menu, with the first record (with Part C as "FLOW") representing the upstream boundary, a storm hydrograph. The second record (with Part C as "STAGE" represents the downstream boundary, a tidal elevation hydrograph.
The user may manually enter data into DSS, but the more common practice is to either import the data from an Excel file or import the data directly from USGS via the web. Below is a screenshot of the HecDSSVue main menu, showing selection of the option to import data from USGS via the web. While running HecDSSVue on your own machine, you can try the procedures shown in the screenshots.
From the main menu, choose the Data Entry pulldown menu for import options:
The USGS web import option brings up a window, shown below:
The Data Type selection box presents three options, as shown in the following screenshot:
To obtain hourly hydrograph data, for example, choose the IDA option, then click the button “Get USGS Station ID’s by State”. This brings up a window for selection of any US state. For example, if the State of Oregon is selected, the program responds that 330 gage locations are retrieved and returns to the download menu with the option to select any of them. The following screenshot shows that the Wilson River has been checked for import. But the user would then click on the button “Show Available Dates” and HecDSSVue would retrieve that information from USGS via the web.
Seeing that the dates retrieved from the web are 30Sep1986 to 30Sep2010, the user can now enter a Start Date and End Date for the actual data desired. The following screenshot shows a request for the time period 28Nov2007 to 8Dec2007, for hourly flow data on the Wilson River.
The user is ready to click the Import button. HecDSSVue then retrieves the requested data from USGS, via the web, and creates a record for it in the “split.dss” file, as shown in the following screenshot:
At this point, the user may choose to plot the retrieved data by selecting the Wilson River record and either right-clicking and selecting “Plot” or clicking the plot button at the top of the main menu (the one with the red rising graph). The resulting plot is shown below: