Just saw this video on facebook and had to share it with my fellow Steemians.
click here to view the video: http://bit.ly/2Hx1Gyq
Source of the video Lad Bible on Facebook.
I did some research online and the drain is manmade to suck in rainwater from the lake. The water is so beautiful and peaceful to watch 😍 🤗
Lake Berryessa is the largest lake in Napa County, California. This reservoir in the Vaca Mountains is formed by the Monticello Dam, which provides water and hydroelectricity to the North Bay region of the San Francisco Bay Area. Source: Wikipedia http://bit.ly/2W1lZIr