|
This Tech Tip explains how to insert erf connections
onto a sewer network.
Setting the defaults:
Edit Menu › Erf Connection Defaults...
Under the Sewer Position, select the appropriate connection type you are going
to use, the available options are : Outside Erf, In Road Reserve & Inside Erf.
Edit Menu › Erf Connection Types...
The erf connection types allow the designer to define
up to 6 different erf connection types according to
the height difference between the invert level of the
sewer at the Y-piece and the invert level of the erf
connection at the end of the connection.
To change one of the displayed items enter the required value in one of the
white cells. The value in the associated grey cell will be updated as soon as
the focus is removed from the edited cell by clicking on another cell. Click on
OK once all the required parameters have been set.
Once the defaults have been defined and the connection types, the erf
connections can be graphically added to the network
Graphical Menu › Add Erf Connections
The program will prompt:
Indicate the position of the new erf connection. You may use any of the drawing
snap modes to do so. As the mouse cursor is moved the elevations are
interpolated from the dtm surface and displayed in the prompt area.
Click with the
mouse to indicate the correct side.
The program
will prompt:
Type in the new erf connection name e.g. E_TT123
If the Calculate Minimum Ground Level on Erf option is selected in the
Erf Connection Defaults dialog the program will prompt:
Click in the middle of the polygon that indicates the erf for which you are
adding the erf connection.
The program will trace the drawing lines that form the erf boundary and the
search for the lowest point inside the erf.
The minimum ground level will be extracted from the dtm and the erf connection
data dialog will open.
Once the erf connections have been added you can view them on the project.
Settings Menu › Display Settings
Make sure Show erf connection layout is selected, click on Erf
Connections to make further changes to the display settings.
Right clicking in the Erf Connection text box, will show test that can be
displayed for the coeenction.
Sewer
network showing erf connections and the minimum ground level on the erf.
Once the erf
connections have been added, the erf connections have to be analysed to see if
flows are possible.
Analysis
Menu › Erf Connections
 | 
