How did floods sometimes help farmers?

If land flooded could either moisten the soil and make it easier to grow crops in, and could also help the plants that were already there to grow... The ancient Egyptians relied on the flooding of the Nile every year!
Hope this helps! :)

from the conditions of the working class in england by friedrich engels,the main idea is :

manchester's leaders hoped to oppress its working class to benefit factory owners.