11ant
2020-10-14 18:22:15
- #1
A canalized stream can only overflow its banks slightly during a flood, a piped one not at all. In the event of flooding, the water therefore backs up at the bottleneck (i.e. at the beginning of the canalization or piping), backs up in front of it and then spreads out broadly across the landscape; only a spreading depression can relieve it. Where it floods the landscape, it naturally also infiltrates (as much as allowed), and in doing so you of course cannot dream of an undisturbed groundwater level. But of course it then also presses against the basement.According to the geodata of Hesse, it is not pressing groundwater. Because the measurements nearby are at worst 3-6m below the ground surface. It probably has something to do with rainfall and the runoff quantity of the stream.