LEARN NC was a program of the University of North Carolina at Chapel Hill School of Education from 1997 – 2013. It provided lesson plans, professional development, and innovative web resources to support teachers, build community, and improve K-12 education in North Carolina. Learn NC is no longer supported by the School of Education – this is a historical archive of their website.

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Canals operate by a series of locks that raise and lower water levels. In this animation, the boat enters the lock from downstream, where the water level is lower. The gate shuts behind it, and water is allowed to flow in from upstream, raising the water level in the lock until the boat can move forward.