Text: You can also view a Roman Nileometer carved in the rock which measured the height of the river and helped the ancient priests to time the announcement of the Nile flood that initiated a movement of workers from the fields to community projects such as temple building.
Entailment: A Nileometer measured the river's height and helped priests with their flood announcements.
Contradiction: The Roman Nileometer was washed away due to erosion and cannot be seen.