A rapid change in the demand at junction can produce a transient. This can be used to simulate a hydrant opening or any rapid change in demand that may have the potential to produce transient pressure change in the system.
-
Click on the Select
button of the Attribute Browser window, and then click on the Select Junction
menu. Select the model junction for the demand change. -
Click on the Demand Change
button on the Surge toolbar. The Junction Demand Change Data dialog box appears on the screen. -
Choose either an existing Demand Change Curve from the drop-down list or click on the Browse
button to the right to create a new curve or edit an existing one. -
Click on the Create button to close the Demand Change dialog box.
Example - An external demand of 45 gpm is held for 2 seconds and then ramps up to 1,200 gpm over the next 4 seconds.
