Big rains in California have dumped more than a million acre-feet of water into the state’s reservoirs since Jan. 1 but this week stalled the Central Valley’s navel and mandarin orange harvests, state and industry officials say. The storms had added 1.1 million acre-feet of water to California’s reservoirs by Jan. 9 with more to come, according to state officials, while prompting the opening of the Sacramento Weir — a flood-control bypass around the city — for the first time since 2006.