user: Question: Information:  - Orinda is a city in Contra Costa County, California, United States. The population was 17,643 at the 2010 census, and was estimated in 2012 to have increased to 18,342. Orinda was ranked the second most friendly town in America by Forbes. The town is located just east of the city of Berkeley and is home to many affluent suburban professionals who commute to downtown Oakland, San Francisco, and Walnut Creek. Its location provides for a more rustic landscape, and Orinda's many parks and trails make it a destination for many Bay Area hikers and naturalists.  - Wildcat Canyon is a narrow linear valley just east of the Berkeley Hills in the San Francisco Bay Area, situated in Contra Costa County, California. The canyon is bounded on its east side by the San Pablo Ridge, and is drained by Wildcat Creek which runs northwest to its outlet in San Pablo Bay. Two minor lakes or ponds lie along the creek: Jewel Lake and Lake Anza. The latter was enlarged by the construction of a small dam in the mid-20th century. An active tectonic fault, the Wildcat Fault, runs the length of the canyon. Wildcat Canyon was named for the mountain lions which used to be fairly common in the area. The southern end of the canyon adjacent to the city of Berkeley was incorporated into Tilden Regional Park in the 1930s and remains a major recreation area for local residents. Another regional park, Wildcat Canyon Regional Park, is situated at the northern end of the canyon.  - East Bay Municipal Utility District (EBMUD), colloquially referred to as "East Bay Mud", provides water and sewage treatment services for an area of approximately 331 square miles in the eastern side of the San Francisco Bay. As of 2007, EBMUD serves approximately 1.3 million people in portions of Alameda County and Contra Costa County in California, including the cities of Richmond, El Cerrito, Hercules, San Pablo, Pinole, Lafayette, Danville, Oakland, Piedmont, Emeryville, Berkeley, Albany, Alameda, San Leandro, neighboring unincorporated regions, and portions of cities such as Hayward and San Ramon. EBMUD currently has an average annual growth rate of 0.8% and is projected to serve 1.6 million people by 2030. Headquartered in Oakland, EBMUD owns and maintains 2 water storage reservoirs on the Mokelumne River, 5 terminal reservoirs, 91 miles of water transmission aqueducts, 4,100 miles of water mains, 6 water treatment plants, 29 miles of wastewater interceptor sewer lines and a regional wastewater treatment facility rated at a maximum treatment capacity of 320 MGD.  - San Pablo Creek is an creek in Contra Costa County, California, United States, which drains the canyon or valley between the San Pablo Ridge and the Sobrante Ridge, parts of the Pacific Coast Ranges east of San Francisco Bay.  - A valley is a low area between hills, often with a river running through it.  - The San Pablo Reservoir is an open cut terminal water storage reservoir owned and operated by the East Bay Municipal Utility District ( EBMUD ) . It is located in the valley of San Pablo Creek , north of Orinda , California and south of El Sobrante and Richmond , east of the Berkeley Hills between the Sobrante and San Pablo Ridges . The earthen San Pablo Dam , built in 1919 , is located at the El Sobrante end of the reservoir , above Kennedy Grove . The reservoir has a total capacity of 38,600 acre feet ( 47,600,000 m3 ) , and a watershed of 23.37 square miles ( 60.5 square kilometres ) . A water tunnel runs under the hills to the west from the reservoir to a pumping plant in Kensington . The San Pablo Dam Road runs along the west side of the reservoir . EBMUD 's Briones Reservoir is in the hills southeast of the San Pablo Reservoir and drains into the reservoir . Although the dam impounds the waters of San Pablo Creek , the great bulk of its water is imported via the Mokelumne Aqueduct from Pardee Reservoir located over a hundred miles to the east in the Sierra Nevada foothills .  - The Mokelumne River is a -long river in northern California in the United States. The river flows west from a rugged portion of the central Sierra Nevada into the Central Valley and ultimately the SacramentoSan Joaquin River Delta, where it empties into the San Joaquin River. Together with its main tributary, the Cosumnes River, the Mokelumne drains in parts of five California counties. Measured to its farthest source at the head of the North Fork, the river stretches for .  - California is the most populous state in the United States and the third most extensive by area. Located on the western (Pacific Ocean) coast of the U.S., California is bordered by the other U.S. states of Oregon, Nevada, and Arizona and shares an international border with the Mexican state of Baja California. The state capital is Sacramento. Los Angeles is California's most populous city, and the country's second largest after New York City. The state also has the nation's most populous county, Los Angeles County, and its largest county by area, San Bernardino County.  - Downtown Oakland is the central business district of Oakland, California, United States; roughly bounded by both the Oakland Estuary and Interstate 880 on the southwest, Interstate 980 on the northwest, Grand Avenue on the northeast, and Lake Merritt on the east.  - A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population. The term is used mostly in connection with national population and housing censuses; other common censuses include agriculture, business, and traffic censuses. The United Nations defines the essential features of population and housing censuses as "individual enumeration, universality within a defined territory, simultaneity and defined periodicity", and recommends that population censuses be taken at least every 10 years. United Nations recommendations also cover census topics to be collected, official definitions, classifications and other useful information to co-ordinate international practice.  - Contra Costa County is a county in the state of California in the United States. As of the 2010 census, the population was 1,049,025. The county seat is Martinez. The name means "Opposite the coast" in Spanish. Contra Costa County is included in the San FranciscoOaklandHayward, CA Metropolitan Statistical Area, CA Metropolitan Statistical Area. It occupies the northern portion of the East Bay region and is primarily suburban.  - The Berkeley Hills are a range of the Pacific Coast Ranges that overlook the northeast side of the valley that encompasses San Francisco Bay. They were previously called the "Contra Costa Range/Hills" (from the original Spanish "Sierra de la Contra Costa"), but with the establishment of Berkeley and the University of California, the current usage was applied by geographers and gazetteers.  - The San Francisco Bay is a shallow estuary that drains water from approximately 40% of California. Water from the Sacramento and San Joaquin rivers, and from the Sierra Nevada mountains, passes through the bay to the Pacific Ocean. Specifically, both rivers flow into Suisun Bay, which flows through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay, which connects at its south end to San Francisco Bay. However, the entire group of interconnected bays is often called the "San Francisco Bay".  - The Pacific Coast Ranges (officially gazetted as the Pacific Mountain System in the United States but referred to as the Pacific Coast Ranges), are the series of mountain ranges that stretch along the West Coast of North America from Alaska south to Northern and Central Mexico.  - The University of California (UC) is a public university system in the U.S. state of California. Under the California Master Plan for Higher Education, the University of California is a part of the state's three-system public higher education plan, which also include the California State University system and the California Community Colleges System.  - San Pablo Ridge is a small mountain range in western Contra Costa County from Pinole to Orinda between Wildcat Canyon and San Pablo Canyon. The western flank is part of the Wildcat Creek watershed and the eastern flank is part of the San Pablo Creek watershed. It is used by ranches for cattle-raising, is largely undeveloped, forming part of county lands and open space. It is adjacent to the Berkeley Hills which are part of Wildcat Canyon Regional Park.  - Sewage treatment is the process of removing contaminants from wastewater, primarily from household sewage. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater (or treated effluent). A by-product of sewage treatment is usually a semi-solid waste or slurry, called sewage sludge, that has to undergo further treatment before being suitable for disposal or land application.    After reading the paragraphs above, choose the best answer for the entity that related to 'san pablo reservoir' with the relationship of 'instance of'.  Choices: - 1  - 100 miles  - application  - area  - bay  - border  - canyon  - capital  - census  - chemical  - city  - community  - count  - country  - county  - district  - education  - estuary  - facility  - head  - information  - lake  - los angeles  - metropolitan  - metropolitan statistical area  - mountain  - overlook  - pacific coast ranges  - part  - people  - plan  - population  - practice  - procedure  - process  - public  - range  - ridge  - river  - running  - seat  - sewer  - sierra  - sierra nevada  - state  - system  - three  - town  - treatment  - tributary  - university  - university system  - valley  - water
Answer:

assistant: lake