Far below the familiar blue of the surface oceans, geophysicists are piecing together evidence for a vast, hidden reservoir of water locked inside the planet itself. Instead of filling open caverns, ...

In an ominous sign for an already struggling project, state officials on Wednesday said they are unhappy with the lack of progress over plans by the Santa Clara Valley Water District to build a huge ...

The Trump administration on Friday approved plans to build Sites Reservoir, a massive new off-stream lake north of Sacramento that would supply water to 24 million Californians and hundreds of ...