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California region, with its 10 4-digit subregion hydrologic unit boundaries. The California water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey in the United States hydrologic unit system, which is used to divide and sub-divide the United States into successively smaller hydrologic units.
Map of water storage and delivery facilities as well as major rivers and cities in the state of California. Central Valley Project systems are in red, and State Water Project in blue. California's interconnected water system serves almost 40 million people and irrigates over 5,680,000 acres (2,300,000 ha) of farmland. [1]
The San Diego Creek watershed is about 80 percent of the total land draining into Newport Bay – one of the largest estuaries in Southern California – and contributes between 77 [9] and 95 percent [10] of the total fresh water inflow to the bay. The population of the Newport Bay watershed in 2000 was about 705,000, which is projected to grow ...
The Novato Creek watershed is known to support 10 extant fish species (6 native and 4 introduced). Native species include California roach, Sacramento pikeminnow, Sacramento sucker, steelhead, threespine stickleback, and Prickly sculpin. Introduced species include rainwater killifish, western mosquitofish, striped bass, and green sunfish. [4]
Eel River watershed map Russian River near Duncan's Mills. Rivers and streams between Humboldt Bay and the Golden Gate that empty into the Pacific Ocean (arranged north to south; tributaries with those entering nearest the sea first): Eel River. Salt River; Van Duzen River. Yager Creek
It shares boundaries with several watersheds – including Segunda Deshecha Cañada to the west, Arroyo San Onofre to the southeast, and streams draining into Lake Elsinore in the northeast. It is slightly larger than the 133.9-square-mile (347 km 2) San Juan Creek watershed, [16] which borders on the San Mateo Creek watershed's northeastern side.
Watersheds of North America are large drainage basins which drain to separate oceans, seas, gulfs, or endorheic basins. There are six generally recognized hydrological continental divides which divide the continent into seven principal drainage basins spanning three oceans ( Arctic , Atlantic and Pacific ) and one endorheic basin.
The watershed experiences a moderately wet Mediterranean climate, with a mean annual rainfall of 24 to 29 inches (610 to 740 mm). [ 7 ] The East Fork of San Luis Obispo Creek is the largest sub-basin, and drains most of the southern part of the city of San Luis Obispo.