The Christchurch City Council says water restrictions have worked, and saved thousands of cubic metres of water.
Photo: 123RF
The restrictions came into place two weeks ago, due to hot weather forecasts and to conserve water for firefighting needs.
Council spokesperson Helen Beaumont says the city has 20 to 30 percent less water each day.
She says the system can manage when the water usage doubles in the afternoon - which is the busiest period of the day. But, on hot days demand can exceed those peaks, and the network starts to struggle.
"What can happen in the afternoons on those hot summer days, is that the demand can double again, it's four times - and sometimes five times that peak hourly demand - when the day gets very hot, and that's when we struggle to get enough waters to our reservoirs and maintain those pressures in the network.
When reservoirs and water pressure are affected, it can create problems if steady supplies of water is needed for activities like firefighting.
To keep water use low, the council has published a series of tips to reduce water use around the home, including watering the garden in the morning when it's cooler, turning the tap off when brushing teeth, and washing only full loads of clothes.