Connections are links between two elements of the Site. They allow a Connection Type to be specified, which will impact the Time of Travel along the Connection and therefore impact the analysis.
The flow routing calculations done during the Analysis are described in Analysis of Connections.
The connections form allows all of the available connections in the phase to be viewed as a table.The spreadsheet then allows the Connection Type and other Physical dimensions to be adjusted as required.
The Columns displayed are effected by the Connection Types shown and can also be filtered using the spreadsheet preferences.
Change Templates - Provides users the option to change the currently assigned templates for Connections.
Delete Row - Clears data in the current row and deletes the selected Connection.
Clear all data - Clears all data and deletes all Connections.
The Filter By drop down list allows the connections shown to be filtered:
A table displaying the results of an auto sizing calculation for a given flow path can be displayed, see Pipe Sizing Report for more information.
When a Flow Path has been selected on the Filter it is then possible to perform an Auto Sizing of the pipe/channels that form the network along the flow path. The calculations are completed based on the specified Pipe Sizing Criteria when the 'Auto Size' option is clicked. Full details can be found in the Pipe Sizing topic.
Fields can be turned on or off using the Spreadsheet Preferences form that is accessed from the toolbar at the top of the form. The full set of columns available on both the Input and the Results spreadsheet are shown and can be turned on or off using the check boxes. These settings will be remembered between sessions.
Name (Always Shown)
Name of the connection as shown on the plan view.
The label of the item at the upstream end of the connection.
The label of the item at the downstream end of the connection.
Length (Always Shown)
Length of the connection. If in red - the length was defined by the user, otherwise, it was calculated using the Connections coordinates from the plan view.
Connection Type (Always Shown)
Type of the connection:
Longitudinal slope of the connection. This is calculated based on the Fall, between the upstream & downstream invert levels, along the Length of the connection. Entering a value for the slope will therefore adjust the downstream invert level.
Manning's coefficient for the connection, which will be used in velocity and flow/capacity calculations.
Colebrook-White roughness for the connection, which will be used in velocity and flow/capacity calculations.
No. of Barrels
Number of barrels/channels laid in parallel.
Diameter of the connection if a Pipe, or base width of a Rectangular or Trapezoidal channel.
Height of a Rectangular, Trapezoidal or Triangular channel.
Introduced into a Box Culvert for pipe strengthening purposes. This value cannot be greater than half the current Width or half the current Height. The default value is 0 and will not be automatically adjusted.
Slope of the sides of a Trapezoidal or Triangular channel.
Upstream Cover Level
The cover/exceedence level at the upstream end of the connection. Levels may be set automatically if sufficient data exists, see individual connection type pages for more details.
Upstream Invert Level
The invert level at the upstream end of the connection. Levels may be set automatically if sufficient data exists, see individual connection type pages for more details.
Downstream Cover Level
The cover/exceedence, level at the downstream end of the connection. Levels may be set automatically if sufficient data exists, see individual connection type pages for more details.
Downstream Invert Level
The invert level at the downstream end of the connection. Levels may be set automatically if sufficient data exists, see individual connection type pages for more details.
The base flow used in pipe sizing calculations if Use Flow Restrictions is checked in the Pipe Sizing criteria. This value is automatically calculated as the discharge rate of the upstream outlet with a water level equal to the free-board level for Stormwater Controls, or the cover level for Simple Junctions and Manholes.
Lock the padlock to exclude the given connection from Pipe Sizing calculations.
Velocity of the flow in the connection. For Pipe Connection, Box Culvert, Rectangular Channel, Trapezoidal Channel, Triangular Channel the Velocity, Time Of Travel is calculated with Muskingum-Cunge methodology.
Time Of Travel
Time of travel of the flow through the connection. This value will be automatically calculated based on the dimensions of the connection, however manually entering a value into the column will overrule this.
The coefficient within the Analysis of SWC/Junctionscalculations when using the Attenuated Flow Connection type. This affects the spread of the connections outflow hydrograph with values closer to 0.5 having less effect. The default value is 0.1, if it has been user specified it will be shown in red.
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