On-Site Effluent Disposal Report

7.1     Pipework

The pump and irrigation system must have a separate effluent storage chamber that matches the electrical starting
requirements of the pump. A volume 200 L is recommended as a minimum. The pump is to have a minimum
capacity of 1.5 times the maximum 30 minute flow rate.

The dripper system can be constructed using either low pressure percolating pipe (Pressure Compensated
Driplines), proprietary drip feed pipe with emitters fixed inside the pipe or low pressure pipe with 5.0mm holes
drilled at 500mm centres. We recommend laying the pipework within a 65 diam. slotted agg drain wrapped in geo-
fabric to prevent root and silt ingress. The pipework is to be installed in accordance with the manufacturers
specifications.

The attached details show the position and construction techniques for either sub-surface or covered surface drip
irrigation.

The pipework is to be spaced to ensure an even distribution of the effluent over the application area. A maximum
spacing of 1000mm in clay soils and 600mm in sand should be adopted. Greater rates of evapo-transpiration is
achieved through closer spacing of the dripper lines and or reducing the spacing between the drip emitters.

The dripper lines should have a stop cock downstream from their connection to the supply line (manifold) and be
brought to the surface at their ends. This will enable flushing of the individual lines and enable easy identification of
blocked lines.

The pipework shall be marked and tested prior to commissioning in accordance with AS1547-2012.

In no instance shall Effluent be used for irrigation of fruit or vegetables.
No Vehicle loading or children’s recreational areas to be applied or constructed within the Land
Application Area.


7.4    Preparation of irrigation area

When a proposed irrigation area has a low permeability, it is particularly important to ensure that the permeability of
the soil in the irrigation area is improved and maintained and that there is an adequate cover of porous and fertile
topsoil to act as immediate storage of effluent applied to it, and to support rapid growth of vegetation on the area to
maximise evaportranspiration.

It is recommended that topsoil be imported to improve rapid growth of vegetation and improve the
evaportranspiration process.

7.5     Requirements of irrigation system

All irrigation pipework and fittings shall comply with all parts of AS 1477 or AS 2698.2. The distribution irrigation
lines shall have a minimum depth of 100mm. There shall be no cross connection between any irrigation pipework
and potable water supply.

Along the boundary of the surface irrigation area there shall be at least two warning signs clearly visible to inform
the occupants of the premises that recycled water is used for irrigation. Each sign shall comply with AS 1319 and
have:

(a) lettering visible at 3m and
(b) wording:               Recycled Water
                           Avoid Contact
                           DO NOT DRINK

Prior to the use of the system, the warning signs and the landscaping and surface preparation must be completed




AUSTRALIAN SOIL INVESTIGATION                              7                                      ASI Ref: 210264(A)