A duration analysis can be started in two ways, either by right clicking on the Duration Analysis folder in the study explorer and selecting New, or by going to the Analysis menu and selecting New and then Duration Analysis. When a new Duration Analysis is selected, the user is required to first enter a Name for the analysis, enter an optional Description, and select a data set from the available data sets stored in the current study DSS file (see chapter 4 for importing data into the study). The Duration Analysis editor will not allow further edits by the user until the name is defined and the data set is selected. The list of data that can be selected for a duration analysis will only include those data that have a regular interval, like 1HOUR and 1DAY (E-part pathname). Choose "None" for the Data Set when defining the duration curve manually on the Manual Entry tab. Once a Name is entered and a data set is selected, the DSS File Name and Report File will automatically be filled out. The DSS filename is by default a DSS file with the same name as the analysis. The report file is given the same name as the analysis with the extension ".rpt". The Duration Analysis editor is shown in the figure below.
