In GeoSTORM software, the Riser Outflow Structure panel of the Storage Area Data dialog box allows the user to define the following parameters: the dimensions of the riser outflow structure and horizontal orifices associated with it, and weirs embedded into the structure. Refer to this article in our knowledge base to learn more about the Storage Area Data dialog box.
Follow the steps below to define specifications for the riser outflow structure:
- In the Storage Area Data dialog box, select Riser Outflow Structure from the Storage Area Specifications dropdown combo box.
- The corresponding panel with the options for defining the riser outflow structure will be displayed.
The following sections describe how to interact with the Riser Outflow Structure panel.
Riser Outflow Structure Dimensions
This section is used to define the general dimensions for the defined riser structure. Note that only one riser structure can be defined for a storage area element.
The following parameters are provided in this section:
- Vertical riser type
This dropdown combo box lists the supported vertical riser structures that are:- Box
- Circular
- Riser crest elevation
This entry field defines the vertical riser structure crest elevation. Click the […] button adjacent to this entry field to measure the vertical riser structure crest elevation from the Map View.
- Riser diameter or width
This entry field defines the diameter of a circular or the box width of a vertical riser structure. Click the […] button adjacent to this entry field to measure the vertical riser diameter or width from the Map View.
- Riser length
This entry field defines the box length of a vertical riser structure. Click the […] button adjacent to this entry field to measure the vertical riser length from the Map View. Note that this entry field is enabled when Box is selected as the vertical riser type. Otherwise, this entry field is disabled (i.e., grayed out).
- Riser overflow weir coefficient
This entry field defines the overflow weir discharge coefficient for the weir crest at the top of the vertical riser structure. Click the […] button adjacent to this entry field and the Weir Coefficients lookup dialog box will be displayed that allows the user to select the weir coefficient to be assigned.
Riser Orifice Specifications
This section provides a data grid that is used to define the specifications of the horizontal orifices embedded in the defined vertical riser structure.
The following column entries are provided in this data grid:
- Orifice Shape
This data grid column contains a dropdown combo box that lists the supported horizontal orifices.
- Circular
- Rectangular
- Orifice Invert Elevation
This data grid column defines the orifice invert elevation.
- Orifice Width or Diameter
This data grid column defines the width of a rectangular orifice or the diameter of a circular orifice.
- Orifice Height
This data grid column defines the height of a rectangular orifice.
- Orifice Coefficient
This data grid column defines the orifice discharge coefficient for the horizontal orifice embedded into the vertical riser structure. Click the […] button adjacent to this entry and the Orifice Discharge Coefficients lookup dialog box will be displayed that allows the user to select the orifice discharge coefficient to be assigned.
Riser Weir Specifications
This section provides a data grid that is used to define the specifications of the weirs embedded in the defined vertical riser structure.
The following column entries are provided in this data grid:
- Weir Shape
This data grid column contains a dropdown combo box that lists the supported weir shapes that are:
- Rectangular
- Trapezoidal
- V-Notch
- Weir Invert Elevation
This data grid column defines the weir invert elevation.
- Weir Bottom Width
This data grid column defines the bottom width of a rectangular and trapezoidal weir. Note that this entry is disabled (i.e., grayed out) when V-Notch is selected as the weir shape.
- Weir Side Slope (H:V)
This data grid column defines the side slope of the sides of a trapezoidal and V-notch weir. Note that this entry is disabled (i.e., grayed out) when Rectangular is selected as the weir shape. - Weir Coefficient
This data grid column defines the weir discharge coefficient for the weir structure embedded into the vertical riser structure. Click the […] button adjacent to the entry field and the Weir Coefficients lookup dialog box will be displayed that allows the user to select the weir discharge coefficient to be assigned.