The task

In addition to the drinking water supply, rainwater takes an increasing part in domestic water supply systems, thus saving money and helping to protect the environment. For example, rainwater can be used for the following needs:

Rainwater can be collected in a suitable system to be used instead of drinking water.

Description of the system

The rainwater is collected in a reservoir. From the reservoir, it is pumped into a respective water supply system. From there it can be tapped in the same way as drinking water. The system functions can be upheld by supplying drinking water if the reservoir runs out of service water. Service water may include  water for various services - washing, bathing, cooking, watering plants, etc.

The goal of this task is to create a control circuit that satisfies the requirements for such an installation.

The sketch below illustrates how such a service water system works:

Requirements of the control system