Eli5… Can hurricane Hillary be a good thing for AZ and NV with all that water?
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It can fill reservoirs, of course, but the real problem is the ground in desert areas tends to be hard and not very absorbent. This means the water will flow off without much absorption, especially when it come so fast. The water will rush into arroyos, creek beds, and other low spots, and eventually into the rivers. There could be massive erosion and damage to bridges, roads, and homes.
The basic short answer is too much water in too short of a time can be very dangerous.
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