Roadway Crossing Data Command

In GeoSTORM, the Roadway Crossing Data command allows the user to define roadway crossing data and display output results. This includes data of any associated culverts and weirs.

Follow the steps below to use the Roadway Crossing Data command:

1. From the Input ribbon menu, click the Roadway Culverts dropdown menu and select the Roadway Crossing Data command.
   
2. The Roadway Crossing Data dialog box will be displayed.
   

The following sections describe how to use the Roadway Crossing Data command and interact with the above dialog box.

Selecting Roadway Crossing

This section allows the user to select the roadway crossing to define the roadway crossing data. The user can create a new roadway crossing, copy existing roadway crossing data to a new roadway crossing, and delete a roadway crossing. In addition, the user can navigate between roadway crossings and enter a description detailing the defined roadway crossing.

The following options are provided in this section:

Crossing ID

This dropdown combo box lists all the roadway crossings that are defined in the model. The user can select the desired roadway crossing from the dropdown combo box.

Click the pencil icon to edit the roadway crossing ID. The user can navigate between the previous and next roadway crossings using the up and down arrow buttons. Alternatively, the user can click the […] button to select the roadway crossing from the Map View.

Note that the up and down arrow buttons will be disabled (i.e., grayed out) when the model contains only a single roadway crossing.

Description

This text field allows the user to enter additional information that describes the selected roadway crossing.

New

The [New] button allows the user to create a new roadway crossing.

On clicking this button, the dialog box will temporarily disappear, and a prompt will be displayed on the status bar instructing the user to draw the roadway crossing on the Map View. Once finished, press the [Enter] key, or right-click and select Done from the displayed context menu.

While drawing a roadway crossing, the user can press the [Esc] key to abort the creation of a new roadway crossing and return the dialog box to its previous state.

The dialog box will be redisplayed with a default unique crossing ID displayed in the Crossing ID entry field.

Copy

The [Copy] button allows the user to copy existing roadway crossing data and any other associated data to a new roadway crossing. When this command is executed, the software automatically provides a unique default name for the duplicated roadway crossing. The cursor is then placed into the Crossing ID. The user can go with the default name or enter a different valid and unique ID before moving on to add any other data.

Delete

The [Delete] button allows the user to delete the current roadway crossing data from the model. Clicking the [Delete] button causes the following confirmational dialog box to be displayed.

Click the [Yes] button to delete the selected roadway crossing data. Click the [No] button to abort the deletion process.

Less/More

The [<Less] and [More>] buttons at the Select Roadway Crossing header allow the user to hide and display the right side of the dialog box containing the Computed Results plot for roadway crossings. This allows the dialog box to be smaller in size when the user does not want to see the plot view.

Roadway Crossing Specifications

This section allows the user to select the various roadway crossing specifications. The user can click on the Roadway Crossing Specifications dropdown selector to choose the various data panels that define the roadway crossing data.

General Specifications Panel

The General Specifications data panel allows the user to define the basic parameters for the selected roadway crossing.

The following sections are available in this data panel:

Roadway Crossing Definition

This section of the General Specifications data panel defines the nodes to which the roadway crossing is connected.

The following entries are provided in this section:

• From (inlet node)
  This read-only field defines the node ID on the inlet end of the roadway crossing. Clicking the […] button allows the user to select the node from the Map View.

• To (outlet node)
  This read-only field defines the node ID on the outlet end of the roadway crossing. Clicking the […] button allows the users to select the node from the Map View.

Clicking the [Swap] button allows the user to switch the inlet and outlet nodes, effectively reversing the direction of the roadway crossing.

Roadway (Weir) Overflow Specifications

This section of the General Specifications data panel defines the input data for the roadway to act as an overflow spillway.

The following entries are provided in this section:

• Roadway (weir) minimum elevation
  This entry defines the roadway crest elevation. Clicking the [Pick] button allows the user to select the roadway (weir) minimum elevation from the Map View.

• Roadway (weir) length
  This entry defines the length of the roadway that will act as a spillway (weir). Clicking the [Pick] button allows the user to measure the roadway length from the Map View.

• Roadway (weir) width (in flow direction)
  This entry defines the width of the roadway (in the direction of flow) that will act as a spillway (weir). Clicking the [Pick] button allows the user to measure the roadway width from the Map View.

• Roadway (weir) discharge coefficient
  This entry defines the weir discharge coefficient for the roadway (weir) structure.

• Roadway surface type
  This dropdown combo box defines the type of roadway surface that will act as a spillway (weir). The following options are provided in this dropdown combo box:

1. • Gravel Surface
   • Paved Surface

Computational Results

This section of the General Specifications data panel displays results from the stormwater computations for the selected roadway crossing.

The following entries are provided in this section:

• Headwater elevation
  This read-only field displays the elevation of the water at the upstream side of the roadway crossing.
• Roadway peak overflow
  This read-only field displays the peak flow rate that occurred as roadway overflow during the storm event.

The following parameters are provided in the read-only table:

• Culvert Set ID
  This table column displays the current set of culverts.
• Number of Culvert Barrels
  This table column displays the number of barrels available for the corresponding culvert set ID.
• Peak Flow Rate
  This table column displays the peak flow rate for the corresponding culvert set during the storm event.
• Maximum Velocity
  This table column displays the maximum flow velocity for the corresponding culvert set during the storm event.
• Headwater/Culvert Height
  This table column displays the ratio of headwater depth to culvert height for the corresponding culvert set, expressed as a ratio (HW/D), where HW is the total depth of water (measured from the invert of a culvert), and D is the interior height of the culvert barrel.

Culvert Specifications Panel

The Culvert Specifications data panel allows the user to define culverts at the roadway crossing.

The following sections are available in this data panel:

Culvert Definition

This section of the Culvert Specifications data panel defines general information about the culvert set being defined.

The following entries are available in this section:

• Culvert set ID
  This dropdown combo box lists all the currently defined culvert sets for the current roadway crossing. Clicking the pencil icon adjacent to the Culvert set ID changes the read-only field into an editable field. The user then can edit the culvert set ID. The software checks that the defined culvert set ID is unique for the current roadway crossing. If not, a warning dialog box is displayed, and the user is then returned to the Culvert set ID field to change the ID. This dropdown combo box also displays a [New Culvert Set] button as the topmost entry in the dropdown combo box list.
• New
  The [New] button allows the user to create a new culvert set.
• Copy
  The [Copy] button allows the user to copy existing culvert set data to a new culvert set. When this command is executed, the software automatically provides a unique default name for the duplicated culvert set.
• Delete
  The [Delete] button allows the user to delete the current culvert set data from the model.
• Culvert shape
  This dropdown combo box lists the available culvert shapes that are supported. The following culvert shapes are available in the dropdown combo box.
  • Box
  • Circular
  • Ellipse
  • Arch
  • Pipe Arch
• Backflow flap gate
  This checkbox option allows the user to enable a flap gate that prevents backflow (or flow reversal) for the culvert.
• Culvert type
  This dropdown combo box lists the available culvert types that are supported based on the culvert shape previously selected.
• Culvert entrance
  This dropdown combo box lists the available culvert entrances that are supported based on the culvert shape previously selected.
• Number of barrels
  This integer spin-control defines the number of identical culvert barrels that are defined. The default value for this entry field is 1.

Culvert Dimensions

The following entries are provided in this section of the Culvert Specifications data panel.

• Diameter or height
  This entry defines the diameter of a circular culvert or the height of other culvert shape types.

• Width or span
  This entry defines the width or span of the culvert shape types. This entry is disabled (i.e., grayed out) for the following culvert shape types:

• • Circular
  • Pipe Arch

• Culvert length
  This entry defines the length of the culvert being modeled. The user can click the [Pick] button to measure the culvert length from the Map View. Clicking the [Recalc] button allows the software to recalculate the digitized length of the current culvert. Similarly, the [Recalc All] button allows the software to recalculate the digitized length of all culverts in the network.

• Inlet invert elevation
  This entry defines the culvert invert elevations on the upstream (inlet) ends. The user can click the […] button to select the culvert inlet invert elevation from the Map View. Clicking the [Match Invert] button causes the culvert invert elevation to be set equal to the connecting node invert elevation.

• Outlet invert elevation
  This entry defines the culvert invert elevations on the downstream (outlet) ends. The user can click the […] button to select the culvert outlet invert elevation from the Map View. Clicking the [Match Invert] button causes the culvert invert elevation to be set equal to the connecting node invert elevation.

• Culvert slope (H:V)
  This read-only field defines the culvert slope. In addition, this read-only field can be used to set the slope of the culvert. Click on the pencil icon adjacent to the Culvert slope (H:V) field. This will change the read-only field into an editable field. The user can now enter the desired culvert slope and click on the [Apply changes] button. The software will then adjust the unlocked culvert end invert elevation to meet the requested slope.Note that to set the slope of the culvert, the user should first select the end of the culvert invert elevation that is to be locked. The following entries are provided in the dropdown combo box adjacent to the Culvert slope (H:V) read-only field:
  • Lock Downstream Invert
  • Lock Upstream Invert

Culvert Coefficients

This section of the Culvert Specifications data panel defines the coefficients used to define the material properties and other properties for the defined culvert.

The following entries are provided in this section:

• Manning’s roughness
  This entry defines the pipe roughness. Clicking the […] button displays a Manning’s Roughness lookup table dialog box as shown below.
  
• Entrance loss coefficient
  This entry defines the head loss coefficient associated with energy losses at the pipe inlet as the flow enters the pipe from a node (i.e., manhole, junction box, routing junction, catch basin, or storage area). Clicking the […] button displays a Culvert Entrance Loss Coefficients lookup table dialog box, as shown below.
  
• Exit loss coefficient
  This entry defines the head loss coefficient associated with energy losses at the pipe outlet as the flow leaves the pipe and enters a node (i.e., manhole, junction box, routing junction, catch basin, or storage area). Clicking the […] button displays a Culvert Exit Loss Coefficients lookup table dialog box, as shown below.