Sunnyvale West Watershed

The Sunnyvale West Channel was constructed in 1964 to manage flooding that was becoming a problem due to subsidence of lands in the drainage area. The Channel watershed drains 7.5 square miles and is entirely located on the alluvial plain of the Santa Clara Valley.  The channel originates in the urbanized sections of Sunnyvale and Mountain View.

The Channel is approximately 3 miles in length, extending from Guadalupe Slough to Maude Avenue (SCVWD 2005b).  From the upper end of the channel at Maude Avenue to Almanor Avenue, the Sunnyvale West Channel is a concrete pipe culvert.  Downstream of Almanor Avenue to Mathilda Avenue, the channel is an earth-excavated channel.  Sunnyvale West Channel drains to Lower South San Francisco Bay via the Moffett Channel and then the Guadalupe Slough.

The Sunnyvale West Channel watershed is almost entirely urbanized with mostly public/institutional development (31%), as well as industrial (25%) and residential (23%) areas (SCVWD 2005b).  The only open space in the watershed is the Sunnyvale Baylands along the San Francisco Bay shoreline and several smaller city-owned parks in Sunnyvale. 

No fish species are known to occur upstream of the tidally influenced area.

Watershed Facts

  • Drainage area:  7.6 square miles
  • Number of creeks:  0
  • Miles of creek:  0
  • Miles of Engineered Channel:  6.7
  • Miles of Underground Culvert or Stormdrain:  18.7
  • Local jurisdictions:  Sunnyvale, Mountain View
  • Percent area by land use:
    • Residential 20.9%
    • Industrial/Commercial 65.2%
    • Forest 0%
    • Rangeland 0%
    • Other 13.9%
  • Percent Impervious Area:  72.4%
  • Beneficial Uses: None

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