Extreme Flows Dialog
This dialog box allows you to create, edit, and view extreme flow factors. The dialog box contains a toolbar, an Extreme Flows list pane, and two tabs. The toolbar contains the following buttons:
The following table describes the rest of the controls in the Extreme Flows dialog box.
Extreme Flows List Pane | Located on the left side of the dialog box, displays a list of all of the extreme flow factors that have been defined in the current model. Highlighting an extreme flow factor in this list causes the Table or Equation sections to display the data associated with the highlighted extreme flow factor. |
Table Section | When a Table-based Extreme Flow factor is highlighted in the Extreme Flows List Pane, this section contains the following controls. Extreme flow factor values that fall outside of the range of boundary values will be assigned the closest in-range value, either the first (lowest) or last (highest) value. |
New button | Adds a new row to the table. |
Delete button | Removes the currently highlighted row from the table. |
Contributing Population column | The contributing population for the associated extreme flow factor value. This column is only available for population-based extreme flow factors. |
Base Load column | The base load for the associated extreme flow factor value. This column is only available for load-based extreme flow factors. |
Extreme Flow Factor column | The extreme flow factor value associated with the base load or population value. |
Equation Section | When an Equation-based Extreme Flow factor is highlighted in the Extreme Flows List Pane, this section contains the following controls. |
Population Unit in Equation | The unit in which population is defined. The coefficients in the equation are based on this unit. This column is only available for population-based extreme flow factors. |
Flow Unit | The unit in which flow is defined. The coefficients in the equation are based on this unit. This column is only available for load-based extreme flow factors. |
Cutoff Value | The maximum possible extreme flow factor for peaking methods. This is used to prevent unrealistically high values for small populations or land areas. |
c1 | Equation coefficient. |
c2 | Equation coefficient. |
c3 | Equation coefficient. |
e1 | Equation coefficient. |
e2 | Equation coefficient. |
m1 | Equation coefficient. |
m2 | Equation coefficient. |
Library Tab | Displays information pertaining to the catalog entry that is currently highlighted in the List Pane, including: ID Label Modified Date Library Source Library Modified Date Synchronization Status |
StormCAD uses a generic exponential equation to define any extreme flow factor method. For population based extreme flow factor methods, the generic equation is:
where P is population and c1, c2, c3, m1, m2, e1, and e2, are constants.
For discharge-based extreme flow factor methods the generic equation is:
where Q is total sanitary (base) load and c1, c2, c3, m1, m2, e1, and e2, are constants.