Option

Description

Erf Length

This is the length of an erf. The engineer 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 on 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 on house connection

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

Erf Connection Diameter

The external diameter for the erf connection sewer link.

Erf Connection Slope

The slope of the erf connection sewer link.

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.

Calculate Minimum Ground Level on erf

If this option is selected, the minimum ground level on the erf will be calculated when the erf is indicated while the erf connection is added. Else the position for the minimum ground level point must be indicated by the user self.