Option

Description

Erf length

This is the length of an 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 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 cover at erf connection

The minimum values of cover to the outside of the pipe barrel for connecting sewers. Recommended values are:

• Inside Erf - 600mm.

• Outside Erf/In Road Reserves - 1000mm.

Minimum cover at house connection

The minimum value of cover at the head of the house drain. The recommended value is 300mm.

Erf Connection slope

The slope of the erf connection sewer link as a percentage.

Erf Connection grade

The slope of the erf connection sewer link as a ratio 1:x.

Erf Connection size

The external diameter for the erf connection sewer link.