Question

Usually the flood season produced a “good Nile,” just the right amount of water. What might be the consequence of a “bad Nile” – too much or too little water?

Answer 1

A "bad Nile" is a lack of water or too much water, so possible consequences include:
Famine (from crops dying)
Destruction of property (from flood waters)
and much more. However, this type of question normally references something in the text, so I suggest checking that section to see if a specific example was ever given.