Run-off from pavement or smooth rock during rainfall is much greater and faster than run-off from soil or other surfaces as there is little obstruction (friction) to the water flow. These surfaces also absorb very little water, meaning that there is a larger amount of run-off.
This means that waterways can have to deal with large intakes of water in a very short amount of time, often leading to flash flooding, as the waterway can not handle such a large amount of water at once.
Personality. Hope this helped!
I think the correct answer from the choices listed above is option 3. The sentence that is the most paradoxical is that "He was old enough to understand the innocence of children." A paradoxical sentence is a sentence that contains self-contradictory words. In this case, the rods old enough and innocence seems to contradict each other.