Humans want to create tall (ideally, hundreds of feet tall) dams which impound a lot of water with minimal effort which stand for 100 years. We're really at it

Humans want to create tall (ideally, hundreds of feet tall) dams which impound a lot of water with minimal effort which stand for 100 years. We're really at it, and we care next to nothing for animals which need to go upstream / downstream. Beavers want to eliminate that damnable gurgling sound by piling a few feet of wood around it. They're not great at it, and animals are basically free to go upstream / downstream. The dams percolate through the mud, leak and rot away, lasting days to years, but not decades. They're dramatically different activities. You're better off comparing beaver "dams" to terraced rice cultivation in hill country, where the entire valley floor turns into innumerable sheets of flat water draining into each other in six inch elevation changes held back by bamboo and mud. A two year old with water wings can destroy a whole town's paddies if allowed to run free. Repairs are a daily thing.