Irrigation from the Opuha dam in South Canterbury will be turned off this evening for the first time in its 17 years.
The dam has very little water left due to the drought over the summer. The Opuha Dam is at less than 5 percent of its storage capacity.
The lake level is down to 371.7 metres and falling by about 5.5 percent daily and is now down to less than 10 percent of its capacity.
The company that runs the dam said it will stop the water flow for irrigation at 6pm today and it may remain shut off for the rest of the summer season.
On February 12, Minister Nathan Guy officially declared the drought conditions on the east coast of the South Island.
The Government is also keeping a very close eye on Wairarapa and southern Hawkes Bay which are also suffering from very dry conditions.