It's in our hands
A Waterhshed consists of basin-like landform and water that is not absorbed into the ground. A watershed carries water "shed" from the land after rain falls and snow melts. Everywhere on earth, water that is not absorbed into the ground will try to flow downhill, channeling into soils, groundwaters, creeks and streams, making its way to larger rivers and eventually the ocean.
The West Valley Communities watersheds are the western boundary of the Santa Clara Valley of the Santa Cruz Mountain Range and will eventually flow to the San Francisco Bay.
Water falling from the other side of the summit will be part of another watershed, with will flow into the Monterey Bay or directly into the Pacific ocean north of Monterey Bay.