This dialog box is used to set up a pit pipe and overflow route data base for a new DRAINS model.  When selected from the Project menu, it allows you to choose a pit data base from those that are stored in the C:\Program Files\Drains\Program or the C:\Program Files (x86)\Drains\Program folder as .db1 files. Usually, there will be a number of these files with regional pit information.  You can add to these or split them into smaller collections, or create your own files with special information.

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The file Drains.db1, located in the folder C:\Programdata\Drains, is the default file that is opened with new projects. It is ignored when you open an existing DRAINS model stored on a .drn file, as this includes its own data base for pipes, pipes and overflow routes.  

When you select a data base from the above dialog box, it overwrites the selected database file onto Drains.db1.