Erf Connection Data Editor

The erf connection data editor allows you to edit erf connections, erf details, and link details. It also includes a page which displays the results relating to the erf connection.

Use the arrow buttons to page through the database, or click on the record number button to search for a particular erf connection or record number.

Option	Description
Arrow buttons	Click the arrow buttons to scroll between the erf connection records. The two outer arrows scroll to the first and last record.
Delete/Recall button	Click to mark the current record for deletion, or if it has already been deleted it will remove the deletion flag. Deleted records are only removed from the database when you close the project and answer Yes to the question "Do you want to remove deleted records?". Once the database has been packed, it is impossible to recover the deleted records.
Record Number button	Click the current record number, i.e. "00001:00087", to search for a specific record.
Show button	Click to move the mouse cursor to the specific erf connection for that record. The window also automatically zooms into the area around that node. The Editor will be "rolled up". Click the Restore icon to unroll it.
Close button	Click to close the window.

Connection Page

Option	Description
Erf Number	The name or reference to this erf connection in up to 25 alpha-numeric characters. Searches can be performed on these names.
Link Name	The name of the link to which the erf connection is connected. None when the erf connection is disconnected due to a change in the sewer network layout.
Difference between ILC and ILS	The calculated height difference between the invert level of sewer at the y-piece and the invert level of the erf connection at the end of the connection at the y-piece.
Type of Connection	The type of connection according to the height difference between ILC and ILS as defined in the Erf Connection Types.
Erf Connection Y Coordinate	The Y coordinate of the erf connection.
Erf Connection X Coordinate	The X coordinate of the erf connection.
Number of Unit Flow units	The number of inflow units that the erf connection represents. The unit name will change according to the selected Inflow Calculation method. The units will be used when the Dynamic Inflow Update option is selected in the Design Parameters.
Unit Flow Inflow Class	The Unit Flow Inflow class or Inflow Hydrograph that the erf connection represents for the Dynamic Inflow Update function.

Erf Details Page

Option	Description
Erf Length	The length of the erf. You must decide whether this length is enough to drain the whole erf, and if necessary, adjust it upwards.
Distance of Connection from Erf Boundary	The distance the erf connection point on the erf is located from the erf boundary for sewer positions Outside Erf or In Road Reserve.
Distance of Connection from Sewer Line	The distance the erf connection point on the erf is located from the municipal sewer line for the sewer position Inside Erf.
Distance of Sewer from Erf Boundary	The distance a municipal sewer is located from the erf boundary.
Sewer position	The method that the Erf connection distance from the sewer main is used in the calculations depends on the Sewer position. Outside Erf - The municipal sewer is located outside the erf boundary. In Road Reserve - The municipal sewer is located inside the road reserve. Inside Erf - The municipal sewer is located in a servitude inside the erf boundary.
Minimum Ground Level (MGL)	Minimum or lowest Ground Level on an erf. The level will be interpolated from the DTM on the position, as indicated by the operator when entering the erf connection.
Ground Level at Erf Connection (GLC)	The ground level of the erf connection at the connection point.
Minimum Cover on erf connection	The minimum distance from the ground line to the top of the link at the erf connection.
Minimum Cover on house connection	The minimum distance from the ground line to the top of the link at the house connection.
Erf Con Slope	The fixed slope for the erf connection link can be specified as a percentage (%) or as a Ratio (1 : x).
Erf Connection diameter	The diameter of the link in millimetres.

Link Details Page

Displays details of the link that the erf connection is connected to. This data cannot be edited.

Option	Description
Link Length	The length of the sewer link.
Link Slope	The slope of the sewer link.
Node Invert level	The invert level of the start node of the sewer link.
Distance from Node	The distance on the link from the start node to the connection point.
Invert Level of Sewer (ILS)	The invert level of the link at the connection point.
Link Y Coordinate	The Y coordinate of the connection point on the link.
Link X Coordinate	The X coordinate of the connection point on the link.

Results Page

Selected results are presented on this page for your information.

Option	Description
Type of Connection	Type of connection in terms of the difference between ILC and ILS, as defined in the Erf Connection Types.
Difference between ILC and ILS	The height difference between Invert Level of Sewer (ILS) at the Y-piece and the Invert Level of the erf connection (ILC) at the end of the connection.
Max Invert Level of Sewer (MILS)	Maximum or highest invert level of the sewer. This is the highest invert level the municipal sewer can have at the plan position of the erf connection Y-piece in relation to the MGL on an erf. The actual invert level of the designed sewer at an erf connection Y-piece position must then be equal to or lower than the MILS.
Invert Level at erf connection (ILC)	This is the highest level at which the erf connection can be in order to be able to drain the erf in relation to MGL.
Invert Level of Sewer (ILS)	The invert level of the link at the connection point. These invert levels should be equal to or lower than the MILS.
Depth of end of Erf Connection below GLC	Depth of end of Erf Connection at the connection point.
Depth of Sewer below MGL	Depth of sewer below MGL on erf.
Minimum Floor Level	Minimum or lowest possible floor level of all buildings or structures to be built on an erf which require drainage in relation to MGL.