Outfalls are terminal nodes of the drainage system used to define final downstream boundaries under Dynamic Wave flow routing. For other types
of flow routing they behave as a junction. Only a single link can be connected to an outfall node, and the option exists to have the outfall
discharge onto a subcatchment's surface.
The boundary conditions at an outfall can be described by any one of the following stage relationships:
- the critical or normal flow depth in the connecting conduit
- a fixed stage elevation
- a tidal stage described in a table of tide height versus hour of the day
- a user-defined time series of stage versus time.
The input parameters for an Outfall are listed in the table below:
| Field | Description | ||||||||||
| Name | User-assigned outfall name | ||||||||||
| X-Coordinate | Horizontal location of the outfall on the Study Area Map. If left blank then the outfall will not appear on the map. | ||||||||||
| Y-Coordinate | Vertical location of the outfall on the Study Area Map. If left blank then the outfall will not appear on the map. | ||||||||||
| Inflows | Click the ellipsis button (or press Enter) to assign external direct, dry weather or RDII inflows to the outfall. | ||||||||||
| Treatment | Click the ellipsis button (or press Enter) to edit a set of treatment functions for pollutants entering the node. | ||||||||||
| Invert El. | Invert elevation of the outfall (feet or meters). | ||||||||||
| Tide Gate | YES - tide gate present to prevent backflow NO - no tide gate present | ||||||||||
| Route To | Optional name of a subcatchment that receives the outfall's discharge. | ||||||||||
| Type |
Type of outfall boundary condition:
|
||||||||||
| Fixed Stage | Water elevation for a FIXED type of outfall (feet or meters). | ||||||||||
| Tidal Curve Name | Name of the Tidal Curve relating water elevation to hour of the day for a TIDAL outfall (double-click to edit the curve). | ||||||||||
| Time Series Name | Name of time series containing time history of outfall stage for a TIMESERIES outfall (double-click to edit the series). |