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.
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.”
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.
Headwaters 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.
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.
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.
Hoover 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.
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
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
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.
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.
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.
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.