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.

Templates - Provides users with the option to add the currently selected Connection to the Templates library.

Delete Row - Clears data in the current row and deletes the selected Connection.

Clear all data - Clears all data and deletes all Connections.

Filtering the tables 

The Filter By drop down list allows the connections shown to be filtered:

  • All Connections - Shows all connections.
  • By Flow Path - Shows the connections that make up the selected  Flow Paths, and its associated network, in the order of flow. This view is of particular interest as it also allows the Pipe Sizing of the pipes & channels in that network.

Pipe Sizing Report

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.

Pipe Sizing Wizard

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.

Spreadsheet columns

Spreadsheet Preferences

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.

Inputs

Name (Always Shown)

Name of the connection as shown on the plan view.

From

The label of the item at the upstream end of the connection.

To

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:

    • No Delay - Imposes no effect of the movement of water.
    • Lagged Flow - Introduces a time delay on the movement of water based on the Time of Travel value entered. Velocity and Time of Travel columns are shown by default.
    • Attenuated Flow - Introduces a time delay and adjustment to the flow hydrograph using Muskingum based on the Time of Travel and Retention Coefficient. Velocity, Time of Travel and Retention Coefficient columns are shown by default.
    • Pipe Connection - Allows a pipe, or series of parallel pipes, to be modelled with a Diameter, Longitudinal Slope and levels. The dimensions can be entered as required or calculated using the Pipe Sizing calculation. Slope, Manning's n, Diameter/Base Width, Upstream Cover Level, Upstream Invert Level, Downstream Cover Level and Downstream Invert Level columns are shown by default.
    • Box Culvert – Allows a Box Culvert, or a series of parallel culverts, to be modelled with a Base Width, Height, Corner Splay, Longitudinal Slope and levels. The dimensions can be entered as required or calculated using the Pipe Sizing calculation. Slope, Manning’s N, Diameter/Base Width, Height, Upstream Cover Level, Upstream Invert Level, Downstream Cover Level, and Downstream Invert Level are shown by default.
    • Rectangular Channel - Allows a Rectangular channel, or series of parallel channels, to be modelled with a Base Width, Height, Longitudinal Slope and levels. The dimensions can be entered as required or calculated using the Pipe Sizing calculation. Slope, Manning's n, Diameter/Base Width, Height, Upstream Cover Level, Upstream Invert Level, Downstream Cover Level and Downstream Invert Level columns are shown by default.
    • Trapezoidal Channel - Allows a Trapezoidal channel, or series of parallel channels, to be modelled with a Base Width, Side Slope, Height, Longitudinal Slope and levels. The dimensions can be entered as required or calculated using the Pipe Sizing calculation. Slope, Manning's n,  Diameter/Base Width, Height, Side Slope, Upstream Cover Level, Upstream Invert Level, Downstream Cover Level and Downstream Invert Level columns are shown by default.
    • Triangular Channel - Allows a non-symmetrical Triangular channel, or series of parallel channels, to be modelled with a Side Slope, Height, Longitudinal Slope and levels. The dimensions can be entered as required or calculated using the Pipe Sizing calculation. Slope, Manning's n, Height, Side Slope, Upstream Cover Level, Upstream Invert Level, Downstream Cover Level and Downstream Invert Level columns are shown by default.

Slope

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 n

Manning's coefficient for the connection, which will be used in velocity and flow/capacity calculations.

Colebrook-White Roughness

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/Base

Diameter of the connection if a Pipe, or base width of a Rectangular or Trapezoidal channel.

Height

Height of a Rectangular, Trapezoidal or Triangular channel.

Corner Splay

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.

Side Slope

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.

Flow Restriction

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.

Auto Size

Lock the padlock to exclude the given connection from Pipe Sizing calculations.

Velocity

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.

Retention Coefficient

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.




Workflow - What's next...?

Inflows connect to either  Junctions or  Stormwater controls  via  Inlets . Specify an  Connections on these objects then choose to connect to another Junction or Stormwater Control.