In 1988 the city began to return water to Mono Lake.

Leaks in lines that return condensed water to the boiler can also waste energy.

For gravity-fed systems, it can sit in the pipework that returns water to the pond from the filter.

When they do, the process usually involves opening a valve in the plumbing that returns water to the furnace from the heating system.

In this case they are concerned with returning water back to the global commons.

He vowed it would be empowered to 'return Scottish water to the ownership and control of local authorities'.

A suction system returning water to the pumps.

The sewers lead to treatment plants that remove the harmful and unwanted parts, returning clean water to the environment.

After the works, a tail goit returned water to the river.

One such use is returning water that has been used back into the natural environment without adverse ecological impact.