Goulburn Murray Water use Glyphosate to control Typa spp., Phragmites spp in irrigation channels and drains. Also in water couch in drains.
Normal rates 6-9L/ha for perennial weeds. 1-3L/ha for annual grasses. Residue limit is 0.1ppm. In natural waterways into which drains discharge the limit is 0.01ppm.
Glyphosate is sprayed directly into creeks and rivers to control aquatic weeds – Broken Creek and Nine Mile Creek.
Goulburn Murray Water – Detections of Glyphosate Broken Creek
8/5/06: GMW Broken Creek Glyphosate 160ug/L
8/5/06: GMW Broken Creek Glyphosate 85ug/L
6/4/95 Broken Creek downstream Devenish Glyphosate 170ug/L
6/4/95 Broken Creek downstream Devenish Glyphosate 20ug/L
6/4/95 Broken Creek downstream Devenish Glyphosate 18ug/L