Yes, floods create a huge problem because they are not very controlled. By their very nature, they sweep up far too much and bring into the system that which is not intended to be in it, including an awful lot of fertilizer and an awful lot of other stuff as well that will impair the quality of the water.
So floods are not helpful, although they are helpful when raising the water level. Witness what was happening in the Muskoka areas in this past 12 months. The levels of Lake Huron are today substantially higher than what they were and what they would normally be expected to be at this point in time. There's been an improvement.