Is '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.' a fitting logical lead-up to 'There is no method for measuring the height of the river.'
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.###There is no method for measuring the height of the river.