Composite Discharge Factors are calculated for some non-residential Option C Community Title Schemes.
Composite Discharge Factors can be used to better reflect the overall amount of sewage that is discharged back into Urban Utilities' sewer network.
This is particularly important when some of the unit owners in an Option C CTS scheme discharge less sewage back into our network than others.
A Composite Discharge Factor is calculated using each units' Discharge Factor and Water Usage (determined based on their percentage share).
Example calculation: Sewage Discharge Factor 1 x Water Usage 1 + Sewage Discharge Factor 1 x Water Usage 1 = Composite Sewage Discharge Factor.
For example, an Option C Community Title Scheme has 10 units. Nine units have a standard 90 per cent discharge factor, while one unit is a brewery which has a discharge factor of 20 per cent.
The brewery is estimated to use 70 per cent of the total water supplied to the scheme. In this scenario the Composite Discharge Factor for the scheme is 41 percent (90% Sewage Discharge Factor x 30% Water Usage + 20% Sewage Discharge Factor x 70% Water usage).