I have seen extremely porous concrete that water drains through very well. Narrow strips of this may be put across a driveway to limit excess water runoff. What is the name of extremely porous concrete? How does one make it? Where would one buy it?
Dry pack it what I learned to call it. It is a regular mix of concrete, but it has just enough water added to it to get the concrete to "kick". This amount of water is so small, it is just enough to get the concrete to hold together when compressed in you hand with a strong squeeze.