When a building approval is required
A building approval is required for rainwater tanks where:
- the diameter of the rainwater tank exceeds 3.5m; or
- the overall height exceeds 2.4m; or
- the base is greater than 5m in length; or
- a supporting structure (i.e. tank stand) is required and the overall height is over 2.4m; and/or
- where the tank is associated with a new building (e.g. new dwelling/school construction)
- where the tank is over/near council infrastructure and on a base with continuing footings (i.e. concrete tank).
Where a rainwater tank and stand be sited
As prescribed in QDC, a rainwater tank with stand can be sited within 1.5m of the boundary when:
- The overall height is less than 2.4m; and/or
- The overall combined length along the side and rear boundaries including other structures is less than 9m.
Otherwise general setbacks are 6m from any road boundary and 1.5m from side and rear boundaries.
Where to discharge the overflow from the tank
In accordance with the Queensland Development Code NMP1.8, storm water from roofed areas, and overflow from any rainwater tanks, is to collected and discharged as follows:
- to the inter-allotment drainage system; and/or
- via an underground pipe to the street channel (Note: Council requires all stormwater drainage pipework, within the road reserve, to be Concrete, Steel, FRC or Class 12 UPVC.); and/or
- where grade does not permit the stormwater to be piped to the street channel, it is to be discharged via an underground pipe with bubbler outlet at least 3m on the downstream side of all building foundations and no closer than 3m to any property boundary in a manner so as to cause minimum inconvenience to adjoining property owners.