Research is not a proof
Science is always subject to dispute. But when it comes to setting policy, the question is whether we set it based on the best available evidence, which often will take the form of scientific research, or whether we just go with what we wish were true. When it comes to matters touching on climate change, liberals, progressives, lefties, and Democrats are usually pretty good about favoring policies that are consistent with the best available evidence, while conservatives, reactionaries, wingnuts, and Republicans go with whatever they wish were true.
Apparently you forgot the record snowstorms that were in the news.
What makes that apparent? Remember, the issue with water levels in cases like this are based on multi-year total precipitation averages within a given watershed, not whether there were particular record precipitation events in that time. If you have a record snowstorm but also record low average precipitation across several years, you're getting the worst of both worlds.