3 edition of Land subsidence in the Santa Clara Valley, California, as of 1980 found in the catalog.
Land subsidence in the Santa Clara Valley, California, as of 1980
J. F. Poland
by U.S. Dept. of the Interior, Geological Survey, Open-File Services Section, Western Distribution Branch in Sacramento, Calif, Denver, CO
Written in English
|Other titles||Mechanics of aquifer systems|
|Statement||by J.F. Poland and R.L. Ireland|
|Series||U.S. Geological Survey open-file report -- 84-818|
|Contributions||Ireland, R. L, Geological Survey (U.S.)|
|The Physical Object|
New data released measure changes in land subsidence in the Sacramento Valley over the past nine years, finding the greatest land surface declines near the city of Arbuckle in Colusa County. According to the Sacramento Valley GPS Subsidence Network Report and accompanying fact sheet, most of the valley has experienced little to no subsidence, however, land in the Arbuckle area has . Some places, such as the Santa Clara Valley, experienced plummeting groundwater levels and land subsidence of 12 feet before the introduction of imported surface water in the s. This imported water, along with other supply diversification measures, allowed groundwater levels to recharge and stabilize over time.
at what places in the Santa Clara Valley would subsidence cause the most problems? Explain your reasoning. Near the bay area because that could allow for flooding and the shoreline to come in, causing an increase of water on the land. As a new report by Dr. Roger Bezdek explains, reality is much different. (His report awaits publication in a scientific journal.) At least for the Chesapeake region, Houston-Galveston, Texas, area, Santa Clara Valley, California, and other places around the globe, the primary cause of seawater intrusions is not rising oceans – but land subsidence due to groundwater withdrawal from subsurface.
land subsidence in the santa clara valley, alameda, san mateo & santa clara counties, california [poland, j.f.] on *free* shipping on qualifying offers. land subsidence in the santa clara valley, alameda, san mateo & santa clara counties, californiaAuthor: J.F. Poland. At least for the Chesapeake region, Houston-Galveston, Texas area, Santa Clara Valley, California and other places around the globe, the primary cause of seawater intrusions is not rising oceans – but land subsidence due to groundwater withdrawal from subsurface shale and sandstone formations, and to “glacial isostatic adjustments” that.
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From to in the San Jose area of Santa Clara Valley, California, deficient rainfall and runoff was accompanied by a fourfold increase in groundwater withdrawals.
In response the artesian head declined ft. The land surface subsided ft in San Jose, due to compaction of the fine-grained compressible beds. The subsidence resulted in flooding of lands, and the compaction of. Throughout the late s and into the s when two thirds of the Santa Clara Valley had been irrigated, water flowed freely from wells.
Water-level declines of more than ft occurred in the Santa Clara Valley from the early 's to the mid 's (Fowler, ).Land subsidence was first detected in (Poland and Ireland, ).As the decades passed, groundwater levels continued to. Problem of Subsidence Since the day in when the first well went in, the Santa Clara Valley has subsided up to 13 feet as groundwater was pumped for agricultural and urban use.
Over-pumping of groundwater during the early twentieth century lowered the pressure in the groundwater aquifer to the point that deep layers of alluvial sediment settled, causing the land surface to subside, that is.
Land subsidence is a gradual settling or sudden sinking of the Earth's surface due to subsurface movement of earth materials. The main cause of subsidence in California is groundwater pumping. The effects of subsidence include damage to buildings and infrastructure, increased flood risk in low-lying areas, and lasting damage to groundwater aquifers and aquatic ecosystems.
Land Subsidence along the Delta-Mendota Canal in the northern part of the San Joaquin Valley, California, USGS Scientific Investigations Report Land Subsidence from Groundwater Use in California Report of Findings, Land subsidence in the San Joaquin Valley, California, USA, 2.
Groundwater History of the Santa Clara Valley  The Santa Clara Valley, located in the San Francisco Bay Area, has experienced a long history of land subsidence resulting from the excess pumping of groundwater [Poland and Ireland, ]. Beginning in the early s, agricul-ture depended heavily on groundwater for irrigation.
The history of subsidence in the Santa Clara Valley is closely related to the major factors that affected the demand on the groundwater system: population growth, changing land use, and importation of surface water (Ingebritsen and Jones, ).
Most of the subsidence occurred in the northern part of the valley adjacent to San Francisco Bay. Land subsidence is a gradual settling or sudden sinking of the Earth's surface owing to subsurface movement of earth materials. Subsidence is a global problem and, in the United States, more t square miles in 45 States, an area roughly the size of New Hampshire and Vermont combined, have been directly affected by subsidence.
Land surface 0 Ground-water pumpage (thousands of acre feet) Agricultural Ground-water pumpage in northern Santa Clara Valley Urban 0 1 2 Population (millions of Santa Clara Valley, California 19 Subsidence had to be stopped In andthe Santa Clara Valley Water District built five. Land subsidence and aquifer-system compaction, Santa Clara Valley, California, USA DECLINE OF ARTESIAN HEAD Extraction of ground water from the valley, in acre-feet per year, increased from ab in to aboutin the ’s.
Until the middle ’s, about 90 percent of the extraction was for agricultural use. Historically, Santa Clara County has experienced as much as 13 feet of subsidence caused by excessive pumping of groundwater.
The photo above shows how land near the Alviso Marina sank more than six feet due to overpumping of local groundwater between the early 20th century, top, and Journal of Hydrology ELSEVIER Journal of Hydrology () The effects of pulsed pumping on land subsidence in the Santa Clara Valley, California A.M.
Wilson*, S. Gorelick Department of Geological and Environmental Sciences, Stanford University, Stanford, CAUSA Received 10 January ; accepted 12 February Abstract Land subsidence caused by pulsed. Land subsidence due to ground-water overdraft in the San Joaquin Valley began in the mid 's and continued at alarming rates until surface was imported through major canals and aqueducts in the 's and late 's.
In areas where surface water replaced withdrawal of ground-water, water levels in the confined system rose sharply and subsidence slowed. Figure 1.—Land subsidence from toSanta Clara Valley, California. Compiled from leveling of National Geodetic Survey in and Valley margin, coarse-grained deposits predominate.
Near the Bay, however, as much as 80 percent is silt and clay. The deposits are tapped by many. Santa Clara ( population 6,), Mountain View ( population 3,) and other Santa Clara County cities also grew to many times their population size.
However, vestiges of the old orchards remained, throughout the county, and as late as San Jose was still classified as partly rural by the United States Census, although the. Get this from a library.
Land subsidence in the Santa Clara Valley, California, as of mechanics of aquifer systems. [J F Poland; R L Ireland; Geological Survey (U.S.)]. The purpose of this report is to summarize knowledge about the extent and costs of subsidence so that this information can be part of a larger discussion on sustainable groundwater management in California.
This report confirms that land subsidence in California is not just an historical occurrence, but that it is an ongoing problem in many.
Land Subsidence from Groundwater Withdrawal Activity Name Course/Section: Date: A Santa Clara Valley, California. Based on Fig. where are the areas of greatest subsidence in the Santa Clara Valley. What was the total subsidence at. Berkeley Seismological Laboratory Next: Application of Point Measurements Up: Ongoing Research Projects Previous: Accelerated Stress Buildup on Contents Land Uplift and Subsidence in the Santa Clara Valley David Schmidt and Roland Bürgmann Introduction.
The Santa Clara Valley is a sedimentary basin whose stratigraphy forms a series of interbedded aquifers and aquitards (Clark. Get this from a library. Land subsidence in the Santa Clara Valley, California, as of [J F Poland; R L Ireland]. The decreasing pressure heads resulted in land subsidence of up to 15 ft ( m).
Recent work has shown that refined management practices have halted land subsidence. Hydrogeology. Well core data indicate that the Santa Clara valley aquifer consists of between four and six different water bearing units.The Santa Clara Valley is a long narrow trough that is a mi 2 ( km 2) coastal watershed that borders the southern San Francisco Bay and principally drains parts of Santa Clara and San Mateo Counties, extending ∼35 mi (∼56 km) southeast from the southern end of San Francisco Bay ().Most of the basin is characterized by gently sloping topography of coalescing alluvial fans that.Meno Park Line of equal subsidence intervaland foot: dashed where poorly controlled.
km Sunnyvale San Andreas Fault This map Figure Land subsidence, –, in the Santa Clara Valley, California. (Map data from J.F. Poland and R.L. Ireland, 19 USGS Professional Paper F. .