Hi Dominik,
Great to hear of your plans and your willing spirit, keep up the good work.
The 1 hectare per family project that Paul is talking about in podcast 170 is part of a large project in Russia. Here are the plans for a similar 1 hectare per family project in Kazakhstan. Having so much water retention is key for supporting people in such high density, these projects provide a model for communities of the future. Below is the plan as well as a concept perspective of the project.
You'll see that each family has access to water and a lot of the plots have access to water on each side. With a civilization system like this water can be an excellent transportation medium for people as well. So much more lovely to have large surfaces of water rather than large surfaces of pavement and gravel!