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.

Length of Erf

The length of the erf. You must decide whether this length is enough to drain the whole erf, and if necessary, adjust it upwards.

Boundary Distance

The distance a municipal sewer is located from the erf boundary. It is negative if the municipal sewer line position is Inside Erf.

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)

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.

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 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.

Invert Level of 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.

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.

Type of Connection

Type of connection in terms of the difference between ILC and ILS as defined in the Erf Connection Types. If the erf connection cannot drain successfully the type will be displayed as Not Possible in red text in the table.

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.

Depth of Sewer below MGL

Depth of sewer below MGL on erf.

Depth of end of Erf Connection below GLC

Depth of end of Erf Connection at the connection point.