One important factor to consider about these 'whiplash' events is that they also deplete the immediate water carrying capacity as the top soil washes away. The top soil normally serves as a 'water battery', and allows the water to absorb quickly with less run off as it slowly absorbs into plants and deeper parts of the ground. As more washes away we can expect more flash floods, more severe drought cycles, and desertification over time.
I really enjoyed this take on this aspect of the problem and future risks[1]. It's astonishing how fascinating and complex the water cycle is. It reveals a lot more than might be obvious about how human activity disrupts water systems of the earth.