Data File

Download the data file here:

Milesburg_Flow_Data.dss

Create a New HEC-SSP Study

Before any analyses can be performed, a new HEC-SSP study must be created and data must be imported.

  • Open HEC-SSP.
  • Select File | New Study…
  • Name the study “SayersDam_MixedPopulationAnalysis” and provide an adequate description.
  • Point HEC-SSP to create the new project in an appropriate location on your computer.
  • If the following options are not already in place, set the units to English and the coordinate system to Geographic | Degrees of Arc | GRS 1980(NAD83).
  • Click OK to create the new project.

Import Data

Now you need to import flow time series for the Milesburg gage.

  • Click Data | New | Using Import Wizard to open the new Data Importer Wizard.
  • Click Next.
  • Leave the Source set to HEC-DSS and click Next.
  • Click the ellipsis button within the Selected DSS File entry field.
  • Within the pop up window, navigate to the “Milesburg_Flow_Data.dss” file.  Click Open to select this file.  This will cause the contents of the selected DSS file to populate within the table listing selectable data sets.
  • Double click on all records within the DSS file in order to add them to the window at the bottom of the Data Importer, as shown in the following image:
    Selecting the Milesburg Time Series for Import
  • Click Next and review your data one last time.
  • When ready, click Import to to import the data set and return to the main HEC-SSP desktop.
  • You should notice that several new records were added to the Study Explorer window under Data.
  • Once the data has been imported, right click on the first data set in the tree and click Edit Metadata.  This data set corresponds to the daily average flow time series.  As such, enter a descriptive Short ID (e.g., "Daily Average Flow") to differentiate from the other time series:
    Entering a Descriptive Short ID
  • Repeat for the other time series.  Once completed, your HEC-SSP study tree should resemble the following:
    Data Sets
  • Click the Save button () to save the study.

Continue to Task 2. Fit an LPIII Distribution Using Bulletin 17C techniques to the All-Season Annual Maximum Series.