SAN JOSE, Calif. — Across the San Francisco Bay Area and California, the past two weeks of soaking storms have brought mudslides, floods and power outages. They’ve also brought something not seen in years: billions of gallons of water rushing into reservoirs, renewing hopes that the state’s relentless drought may come to an end this spring. Six atmospheric rivers storms since the end of December have dumped half a year’s worth of rain on San Francisco, Oakland, Sacramento and other Northern California cities in two weeks. The ferocious weather has saturated soils, while also smothering the Sie...