The term ''flatlining'' was used on Tuesday in an Environment Court appeal hearing in Cromwell to describe the state of the Lindis River and several other Otago waterways at times resulting from the overallocation of water for irrigation.
Niall Watson, on behalf of the Otago Fish and Game Council, was giving evidence supporting a 900 litres per second minimum flow in the Lindis.
He defined flatlining as ''artificially depressed flows for long periods'' and applied it not only to the Lindis but to the Lower Manuherikia and Arrow Rivers, which had ''unnaturally low'' flows, and the Kye Burn, Sow Burn, Pig Burn, Ida Burn, Cardrona River, Quartz Creek, Benger Burn, Low Burn and Bannock Burn, which, like the Lindis, dried up completely during summer.
''Artificially depressed flows for long periods - known as flatlining - remove natural variability, meaning aquatic life does not get relief from stressful low flow events.
In effect these rivers are subjected to severe artificial droughts every single year.''