The guy began by explaining that a watershed is defined as the area where percipitation (rain and snow that falls there) drains into the same creek. San Francisco has several different watersheds.

  

All of the water that falls on the west side of the ridge flows to the same treatment plant, but there are two different creeks draining the bay side. The watershed that drains down Cesar Chavez is the Precita Creek one.

  


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