Div. B › Part 8 › 8.4 › 8.4.1 — General Requirements

8.4.1.2 — Application

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(1) A Class 2 sewage system shall be designed only for the treatment and disposal of greywater.

(2) The total daily design flow for a Class 2 sewage system shall be calculated based on the fixtures discharging to the system as follows:

(a) 200 L per fixture unit where there is a supply of pressurized water, and

(b) 125 L per fixture unit where there is no supply of pressurized water.

OBC Definitions

Defined terms on this page

fixture

means a receptacle, plumbing appliance, apparatus or other device that discharges sewage or clear water waste, and includes a floor drain.

fixture unit

means , when applied to a drainage system, the unit of measure based on the rate of discharge, time of operation and frequency of use of a fixture that expresses the hydraulic load that is imposed by that fixture on the drainage system.

greywater

means sanitary sewage of domestic origin that is derived from fixtures other than sanitary units.

sewage

means sanitary sewage or storm sewage.

sewage system

means , (a)a chemical toilet, an incinerating toilet, a recirculating toilet, a self-contained portable toilet and all forms of privy, including a portable privy, an earth pit privy, a pail privy, a privy vault and a composting toilet system, (b)a greywater system, (c)a cesspool, (d)a leaching bed system, or (e)a system that requires or uses a holding tank for the retention of hauled sewage at the site where it is produced before its collection by a hauled sewage system, where these, (f)have a design capacity of 10,000 litres per day or less, (g)have, in total, a design capacity of 10,000 litres per day or less, where more than one of these are located on a lot or parcel of land, and (h)are located wholly within the boundaries of the lot or parcel of land on which is located the building or buildings they serve.

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