What are the harms of excess of water in the fields?

What are the harmful effects of ethanol?

What are the harmful effects of untreated sewage?

With excess of water, PCl_5 gives

160 m^(3) of water is to be used to irrigate a rectangular field whose area is 800 m^2 . What will be the height of the water level in the field?

What are the harmful effects of smoking cigarettes?

What are harmful effects of using tobacco?