Irrigation methods

Gravity irrigation systems rely on gravity to evenly distribute the greywater to all parts of the irrigation area. Gravity irrigation systems should only be installed in flat/gentle slope sites, to avoid ponding of greywater at the lowest points in the irrigation area. Check with the manufacturer for recommended pipe diameters and maximum irrigation pipe work lengths. The key to good irrigation practice is to maintain distribution uniformity across the irrigation area.

Gravity feed, low pressure irrigation system. Note even distribution and no pooling of water at low point. Source: Standards Australia and National Water Commission

Subsurface pressurised irrigation systems are ideal for sloping sites, as these systems can evenly distribute the greywater across the irrigation area. Check with the manufacturer for recommended pipe diameters and pump pressure requirements as items will vary depending on the irrigation pipework design, length and overall irrigation area as to the size required.

Surface irrigation can be used for relative level areas and the greywater usually needs to be treated to a high quality before it can be used for spray irrigation. Check with the manufacturer for recommended pipe diameters and pump pressure requirements as items will vary depending on the irrigation pipe work design, length and overall irrigation area as to the size required.

Please note: Surface irrigation is only suitable for treated greywater sytems.

Pressurised surface irrigation of greywater - only suitable for treated greywater systems. Check with the responsible regulatory authority as to the level of treatment and setback required by the greywater. Source: Standards Australia and National Water Commission