| Irrigation Drainage Disposal In some cases, specific regional requirements apply to the disposal of irrigation drainage water. Contact your local Catchment Management Authority for details. Drainage Reuse Re-use of irrigation drainage and runoff is being increasingly recognised as an important way of increasing water use efficiency. In some regions, DSE programs are providing subsidies and technical advice. Contact your local Catchment Management Authority for details. | ![]() Monitoring drainage channel salinity, Sunraysia, 1991. Photo: Ted Lawton |