Creeks
The Bay Area has a network of streams that are generally called creeks, but sometimes called arroyos, due to the Spanish language heritage evident in names such as Santa Rosa Creek and San Pablo Creek. Due to low rainfall in the summer months (May–October), many Bay Area creeks are intermittent, flowing above ground only during part of the year.
Political groups have been formed to preserve creeks or restore creeks which have been culverted for development. Baxter Creek in Contra Costa County has been daylighted in various points along its piped route by Friends of Baxter Creek. Other organizations include Friends of Five Creeks which monitors, restores, cleans and educates in relation to creeks flowing from the Berkeley Hills to the Eastshore Estaury in the East Bay.
Further information: List of watercourses in the San Francisco Bay AreaGuide to San Francisco Bay Area Creeks
Read more about this topic: Hydrography Of The San Francisco Bay Area