Dimension Cistern - Building Plan Tips

Well, for us it is, for example, that we are not allowed to discharge rainwater into the sewage system and are forced to install a cistern/soakaway.

Well, for example, where we live, we are not allowed to drain rainwater into the sewer system and are forced to install a cistern/infiltration pit.

In this case, an infiltration pit is probably required. However, a cistern initially has nothing to do with drainage, as it only serves as a temporary buffer. Once it is full, the water must be discharged 1:1. So if it is not mandatory, due to reduction, etc., I would have the additional cost for a cistern offered to me. Then you can decide if it is worth it to you. Regarding size, I would not go below 5m³, but also not over 8m³. In between depends on the application. If it does not really rain for 3 weeks in summer, you can empty a 12m³ cistern as well. However, this is rather rare in our latitudes. If it is also intended to regularly wash cars, bicycles, motorcycles, connect toilets, or refill the 10 fountains and ponds in the garden, then even 10m³ might make sense. For example, our pond easily holds our cistern’s fill, and water is changed there every 1-2 years. In addition, 200l-500l have to be refilled there weekly in summer.

A cistern for 1000 euros, a shaft for 500 euros, and a 200 euro DIY store pump, these are the things I have. I laid lawn the summer before last and watered my property nicely. With a clear conscience while the area from my property boundary was all gray and burnt. I haven’t calculated exactly when it will pay off, but if I assume that everything is getting more expensive, then it will eventually amortize.

Just for my information: have garden fountains gone out of fashion, or are they not permitted in many municipalities? In my old building settlement, they are almost exclusively present. Therefore, I find that surprising.

depends on the region. if the groundwater is not too deep and replenishes quickly enough, it is still a usable solution. in many cases, however, it is more expensive than a cistern. furthermore, it is not allowed everywhere and drilling also carries the risk that the groundwater level will eventually drop and the source will then run dry.

As written. We are not allowed to discharge rainwater into the sewer system. Therefore, I am left with either the cistern or the soakaway pit. At least with the cistern, I can still use the water for the garden. We will not connect it to the house (e.g., toilet flushing). My plan is to have a well drilled that fills the cistern when it is empty. A 6,000-liter concrete cistern has already been installed and connected to the rain gutters.