it's not actual piss ditches. The thing is that we're camping on fields that are actually supposed to be for cattle. And over here the fields are separated by ditches. They are used as natural border sometimes for the cattle but mostly because otherwise the fields would flood. When it's raining, the water in the fields flows into the ditches. That's how they drain the fields. And of course with like 100k people on those fields there are always lots of jerks that decide to piss in there instead of using the toilets.