To answer yesterday’s question about how the water moves into and out of locks. Valves and gravity.
Original at the Army Corps of Engineers.
It’s A Big Dam Country — Extra #1
animals, and bikes, and the countryside. oh my!
animals, and bikes, and the countryside. oh my!
To answer yesterday’s question about how the water moves into and out of locks. Valves and gravity.
Original at the Army Corps of Engineers.