To Analyze and Size Gravity Pipe Networks

Prepare the pipe network for flow rate analysis and sizing

Before analyzing and sizing the pipe network, you must first set up the pipe network and create catchments or determine the Known Q. For more information about prerequisites, see About Analyzing and Sizing a Gravity Pipe Network.

To analyze and size a pipe network for specified rainfall data

1. Click the Analyze tab Design panel Analyze Gravity Network Find.
2. Select the pipe network you want to analyze. You can select the network in the drawing or press Enter and select the pipe network from the Select Pipe Network dialog box.
   After you select the pipe network, the Analyze Gravity Network wizard is displayed.

   Note: If the selected pipe network is data-referenced, the energy and hydraulic grade lines can be computed, but analysis results cannot be applied to the pipe network.
3. On the General page, review and specify the following items:
   • Pipe network
   • Outfall part
   • Tailwater condition
   • Analysis types to run
   • Default Settings to use for structures, tributary areas, and pipes
4. On the Rainfall page, specify the rainfall file and the Annual Exceedance Probability to use for the analysis.
5. On the Structures page, specify settings and values for the structures.
   Note: On the Structures, Tributary Areas, and Pipes pages, you can load the default settings into either all fields or all empty fields. A dash (---) indicates that a property is not applicable to the object type.
   Note: To edit multiple rows in a column, hold down the Ctrl or Shift keys when selecting the rows and then keep the Shift key pressed when you click the column.
6. On the Tributary Areas page, specify settings and values for the tributary areas.

   Only inlet structures are displayed on this page. Catchments that have been created in the drawing for the inlets are shown as associated with the inlet structures. You can specify a Known Q for inlet structures which do not have catchments associated with them, or to include additional flow.

7. On the Pipes page, specify settings and values for the pipes.
8. Click the Analyze button at the bottom of the wizard to process the analysis.
9. On the Results page, you can review the results by saving them to a .csv file and previewing the changes in profile view, you can modify the results, and you can apply the results to the pipe network.