Both Doctors Swamp and Reedy Swamp can receive environmental water via irrigation supply infrastructure within the Shepparton and Central Goulburn irrigation districts. The volume delivered at any one time depends on available capacity in the irrigation supply network.
Reedy Swamp is naturally inundated during high flows (of about 20,000 ML per day) in the Goulburn River. Doctors Swamp can only receive environmental water if the Cattanach Canal is running at 2,500 ML per day and there is available capacity after irrigation demand is met, which is also influenced by the operation of Waranga Basin. Due to this the opportunity to deliver environmental water is greater in autumn and winter.