It has an adjustable return flow rate so you can control how full your tank is at all times. (geekwrapped.com)
Over 679,000 ML of Commonwealth environmental water was provided directly to the South Australian Murray (including over 284,000 ML of return flows from upstream Commonwealth environmental watering events in the Goulburn - Broken catchment, Campaspe River and Hattah Lakes). (environment.gov.au)
Return flows in the Lowbidgee floodplain (release of water from the floodplain to the main channel) contributed to improvements in water quality across the river red gum wetlands, reducing the risks of future hypoxic blackwater events. (environment.gov.au)