How did the flooding cycle provide a seasonal rhythm for the egyptian people?

This is easily explained with the fact that the Egyptian people were farming along the river Nile and waited for the flooding cycle which brought increased amounts of water from the mountains as the snow was melting. Due to this, they could arrange their seasonal working rhythm of growing crops according to the flooding cycle and could prepare for increased amounts of water which they could use to  help grow their crops. 

C) the conditions in the factory have never been questioned by the employee.