The GAMA program is a comprehensive assessment of statewide groundwater quality. The program is designed to help better understand and identify risks to groundwater resources. Groundwater is sampled at many locations across California in order to characterize its constituents and identify trends in groundwater quality.
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GAMA Public-supply Well (Deep Aquifer) Assessment Study Units
The GAMA program is a comprehensive assessment of statewide groundwater quality. The program is designed to help better understand and identify risks to groundwater resources. Groundwater is sampled at many locations across California in order to characterize its constituents and identify trends in groundwater quality.
Post-fire Debris Flow
Debris Flow in Cable Canyon following the 2003 Old Fire in the San Bernardino Mountains, California.
Debris Flow in Cable Canyon following the 2003 Old Fire in the San Bernardino Mountains, California.
Map of study areas in Sonoma and Mendocino Counties.
Map of study areas and key geographic features in Sonoma and Mendocino Counties.
Map of study areas and key geographic features in Sonoma and Mendocino Counties.
Anza Valley, CA
Groundwater is the sole source for water use to the rural community and two Native American tribes in the Cahuilla Valley and Terwilliger Valley groundwater basins, which are located approximately 35 miles southwest of Palm Springs, California.
Groundwater is the sole source for water use to the rural community and two Native American tribes in the Cahuilla Valley and Terwilliger Valley groundwater basins, which are located approximately 35 miles southwest of Palm Springs, California.
Map of study area, Yucca Valley, California.
Map of study area, Yucca Valley, California.
Map of study area, Yucca Valley, California.
Aquifer Compaction
Fine-grained sediments (clays and silts) within an aquifer system are the main culprits in land subsidence due to groundwater pumping. Fine-grained sediments are special because they are composed of platy grains. When fine-grained sediments are originally deposited, they tend to be deposited in random orientations.
Fine-grained sediments (clays and silts) within an aquifer system are the main culprits in land subsidence due to groundwater pumping. Fine-grained sediments are special because they are composed of platy grains. When fine-grained sediments are originally deposited, they tend to be deposited in random orientations.
Land Subsidence in the San Joaquin Valley
Approximate point of maximum subsidence in the San Joaquin Valley, California. Land surface subsided ~9 m from 1925 to 1977 due to aquifer-system compaction. Signs on the telephone pole indicate the former elevations of the land surface in 1925 and 1955.
Photograph by Richard Ireland, U.S. Geological Survey
Approximate point of maximum subsidence in the San Joaquin Valley, California. Land surface subsided ~9 m from 1925 to 1977 due to aquifer-system compaction. Signs on the telephone pole indicate the former elevations of the land surface in 1925 and 1955.
Photograph by Richard Ireland, U.S. Geological Survey
Hooe Building
The Hooe Building
Location
- Address: 16th Street NW, Washington, D.C., at the corner of 16th and H Streets NW.
- Current Reference: The site is now known as the Hooe Building (Historical).
Historical Background
The Hooe Building
Location
- Address: 16th Street NW, Washington, D.C., at the corner of 16th and H Streets NW.
- Current Reference: The site is now known as the Hooe Building (Historical).
Historical Background