Connection cistern - fresh water connection

Hello,

I am currently considering how to get fresh water for the upcoming civil engineering works when the cistern runs dry. I am currently planning the following: I will connect the pump connection of the cistern to a water socket near the fresh water connection (in the northwest of the property). From this water socket, I will run two more water sockets (in the southwest and southeast). If the cistern runs dry, I can simply connect the outdoor faucet to the water socket using a hose connector and switch off the cistern pump. Is there anything against this concept?

I am still wondering how to manage a possible future automatic irrigation system with such a setup. Somehow, the concept does not seem quite right to me. Do you have any tips for me?

Automatic refilling for the cistern. From the fresh water line directly, you do not have sufficient pressure and flow for automatic irrigation. Or you plan right away with this limitation. It is more expensive and leads to longer watering times. So it's better to refill the cistern directly and the cistern pump feeds the system.

OK, an automatic refill then depends on the fill level, I assume. How do you do something like that? Is there a system for that?

I am planning to transmit the fill level via a 24 V probe to the KNX bus. That means the KNX bus then somehow has to be able to control a valve for the fresh water supply, right?

If you have KNX you can do it like this (Tank sensor from Elsner I can recommend). Or simply use a float switch at the desired level. There are also valves which are DVGW approved where you can directly distribute your fresh water / rainwater control. This must (I believe) be approved by the water supplier.

With KNX you have many possibilities. From a sensor at the desired height to ultrasonic sensors with KNX gateway that also provide you with level information, etc. The fresh water line requires a system separator on the way to the cistern. It is usually advisable to start refilling when it is half empty. The cistern pump draws more than the fresh water line refills. When half is reached again, stop the refilling. This leaves room for natural precipitation.