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Southern California’s trend of rainy weather is expected to resume this week after several dry and unusually warm days. The National Weather Service says a few disturbances will move through Friday and Saturday, bringing rain and mountain snow. The second system arriving Saturday will be very cold and snow levels may affect travel through mountain passes. Just as the recent strong El Nino ocean-warming phenomenon failed to bring rain to Southern California, the ocean-cooling known as La Nina hasn’t lived up to expectations of drier than normal weather.

A press release last week about the release of 97,000 pages of final environmental documents for the Delta tunnels says construction will begin “as soon as 2018.” We’ve heard projections like that before. In January 2009, the Schwarzenegger administration said construction on a peripheral canal — the predecessor to the tunnels — would start in 2011. Nearly eight years later, here we are still talking.

This year has been a big one for water. California is still mired in drought, although less of the state is suffering than in previous years and each winter rainstorm brings a fresh bit of optimism. A large reserve of groundwater was found deep under the drought-stricken Central Valley, recycled water continues to gain in popularity, flooding to help fish and farmers is panning out and 2016 will likely wrap up as the hottest year on record. Below are seven other significant milestones that impacted California water and will help shape the year ahead.

It’s too soon to declare an end to California’s five-year drought despite the heaviest rain in three decades falling early in the wet season, officials said. The Sierra Nevada snowpack, which provides roughly one-third of California’s water supply, measures at 72 percent of normal for water content, according to the state’s Department of Water Resources’ electronic monitors.