These have to be manned? Like 24/7 or...how much human labor is involved here? What % of salmon make it into human hands and through these tubes? Earlier attem

These have to be manned? Like 24/7 or...how much human labor is involved here? What % of salmon make it into human hands and through these tubes? Earlier attempts at fish ladders saw rates as low as like 3% for certain species of fish, per ladder/dam. Even if 50% of salmon got up them, if they have to pass 5 of them on the way to the spawning ground that meant 97% of salmon wouldn't make to the spawning grounds. Also, obviously, the ecological effects aren't just "tasty fish can't make babies". The impact on seasonal floodplains and sedimentation is huge by itself.