The information board explains: The water for many irrigation systems comes from an inland lake like this one, the Flatatjønn. In order to collect as much water as possible up in the mountains, a dam was usually built. Even if the lake has no major tributaries, the mountains receive large amounts of precipitation. Water rights to such inland lakes were a valuable possession that could also be sold from farm to farm. The rights to this lake were passed down in the village with the farm inheritance. The area around the Flatatjønn is also suitable for reindeer herding. This explains why there are several reindeer pits on the south side of the lake.