Dam

This dam in the creek Semme is one in a series of 5 on a section of 350 metre. The Semme is 1 metre or smaller. But the nutrias who built them thought it better to have some little sees (and flooded land).
The dam in my blip is about 1 metre high, the other 4 were more like 30-50 cm. At least one of them had mud at the high end side, thus making the dam really impermeable. Smart.