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Banner May 22, 2014

Your Online Water Encyclopedia

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H

Overview February 4, 2014

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Aquapedia background February 11, 2014

Robert “Bob” M. Hagan

Robert “Bob” M. Hagan, Ph.D. (1917-2002), internationally renowned for his expertise in the relationships between plants, water, soil and water use efficiency — specifically in the area of agricultural water use — was a professor of water science, an irrigationist in the California Agricultural Experiment Station and a statewide extension specialist in the California Agricultural Extension Service during a 50-year career with the University of California, Davis.

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Aquapedia background February 11, 2014

Stephen K. Hall

Stephen K. Hall (1951-2010) led the Association of California Water Agencies (ACWA) as its executive director from 1993 until retiring in 2007 from the effects of Amyotrophic Lateral Sclerosis (ALS), or Lou Gehrig’s disease. Hall continued to stay current on water issues and to advocate for legislation on ALS at the state Capitol until he died.

His motto became “As much as I can for as long as I can.”

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Aquapedia background February 11, 2014

William Hammond Hall

William Hammond Hall (1846-1934) is credited with the first proposal of an integrated flood control system with levees, weirs and bypass channels for the Sacramento Valley after his appointment as the first California state engineer.

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Aquapedia background August 25, 2016 Layperson's Guide to California Water California Water Map

Headwaters

Sierra Nevada headwaters streamHeadwaters are the source of a stream or river. They are located at the furthest point from where the water body empties or merges with another. Two-thirds of California’s surface water supply originates in these mountainous and typically forested regions.

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Aquapedia background February 4, 2014

Hetch Hetchy Reservoir and Water System

Located in the northwest portion of Yosemite National Park, Hetch Hetchy refers to a valley in the Sierra Nevada and a reservoir that supplies water to the San Francisco Bay Area. The valley is drained by the Tuolumne River. The name Hetch Hetchy is derived from a Sierra Miwok word for a type of wild grass.

Owned by the city of San Francisco, Hetch Hetchy Reservoir provides water to 2.7 million residents and businesses in the San Francisco Bay Area.

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Aquapedia background January 30, 2014

Alex Hildebrand

Alex Hildebrand (1913-2012) had an understanding and knowledge of California’s South Delta and San Joaquin River bar none. After retiring early from a career as an engineer for Standard Oil of California, he moved his family to the San Joaquin Valley where he farmed for nearly 50 years while active in water issues and as an advocate for the area.

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Aquapedia background February 4, 2014 Dams Layperson's Guide to the Colorado River

Hoover Dam

Hoover DamHoover Dam, one of the tallest dams in the United States and a National Historic Landmark that draws tourists from across the globe, is a key reservoir providing flood control, water storage and irrigation along the lower Colorado River. It also is one of the nation’s largest hydroelectric facilities, generating on average about 4 billion kilowatt-hours of hydroelectric power each year, enough electricity to serve more than 1.3 million people in Nevada, Arizona and California.

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Aquapedia background January 30, 2014

Clair A. Hill

Clair A. Hill (1909-1998), a self-made engineer nicknamed “California’s Mr. Water,” built from the ground up an engineering firm that would merge to form the global consulting firm of CH2M HILL.

In 1938 in his hometown of Redding along the Upper Sacramento River in Northern California, he founded Clair A. Hill & Associates. Before merging with CH2M in 1971, the two firms had collaborated on many projects together, including the Lake Tahoe Advanced Wastewater Treatment Facility — the first of its kind in the world.

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Aquapedia background February 10, 2014

Julian B. Hinds

Julian B. Hinds (1881-1977) was Metropolitan Water District of Southern California’s general manager and chief engineer from 1941-1951, but began work on the Colorado River Aqueduct in 1929 soon after the district was organized.

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Aquapedia background February 3, 2014

Edward Hyatt Jr.

Edward Hyatt Jr. (1888-1954) was the state engineer of California from 1927-1950. In a 1928 report he wrote titled “Water is the Life Blood of California — The Division of Engineering and Irrigation of the State Department of Public Works; What it Does and How it Operates,” he called the department the “building organization of California’s state government” and described successes, challenges and responsibilities of his position.

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Aquapedia background February 4, 2014 California Water Map

Hydroelectric Power

William R. Gianelli Powerplant at San Luis Reservoir. Hydroelectric power is produced when water released from a reservoir turns a turbine connected to a generator.  Gravity causes water to drop toward a turbine propeller. The falling water then turns the turbine, which produces power through the connected generator.

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Aquapedia background September 7, 2016

Hydrographs

A hydrograph illustrates a type of activity of water during a specific time frame. Salinity and acidity are sometimes measured, but the most common types are stage and discharge hydrographs. These graphs show how surface water flow responds to fluxes in precipitation.

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Hydrologic Cycle
Aquapedia background February 10, 2014

Hydrologic Cycle

Both surface water and groundwater are connected through the hydrologic cycle, essentially the life span of a drop of water.

A drop of water can be birthed, say, by precipitation in the Sierra Nevada range—home to much of California’s runoff.

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