Boundary Overrides tab

Boundary overrides are explicitly specified for each design event and used for evaluating a trial design solution for a design event.

Boundary conditions can be used to override initial settings from the design representative scenario for a design event. For example, if you want to simulate a pipe break, you can set the status of a pipe to closed for a pipe-outage design event. Similarly, valve settings can be applied, tank levels, and so on. Without a specified boundary condition for a design event, Darwin Designer will apply the initial settings from the representative scenario when evaluating the corresponding design event.

When calculating an EPS model to get boundary conditions, Darwin Designer uses the sizes, demands, etc., that are present in the representative scenario. If the representative scenario includes lots of unsized pipes, then you will need to override the appropriate boundary conditions (such as, a tank in a new part of the model). If you do not specify a time step on the Demand Adjustments tab, the initial conditions at time 0 will be used.

You only need to explicitly state a boundary condition if you wish to change it from the default. Do not try to look at boundary conditions by selecting All Pipes or All Pumps because this sets all pipes to Closed or all pumps to Off.

New	Click to add a new design event. Opens the Select Snapshot box where you can select a new design event or an existing design event. Click OK after you make a selection.
Duplicate	Click to create a copy of the selected design event. This can be an efficient way to create a new design event that has many of the attributes of an existing event.
Delete	Click to delete the selected design event.
Initialize Table from Selection Set	Click to open the Initialize Table from Selection Set box where you can choose the Selection Set and the Design Event. Click OK to run.
Load from Model	Click to open the Load from Model box. Load settings and conditions for your elements at a time from start that you specify. For example, if your peak time is 6 pm, you can load the settings for your elements from the model at that time. Click OK to run.

Design Event	The name of the event.
Element	Click the ellipsis to select from the drawing the type of element to set a boundary condition: pump, tank, pipe, or valve.
Attribute	The attribute list reflects your selection of an element type.
Value	Open, Closed, On, Off, or a numeric value depending on the selected attribute.