Potential Effects of Increased Ground-water Pumpage on Barka Slough, San Antonio Creek Valley, Santa Barbara County, California PDF Download
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Author: Michael J. Mallory
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 24
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Author: Michael J. Mallory
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 24
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Book Description
Author: Michael J. Mallory
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
Ground-water use in San Antonia Creek valley, California, is expected to increase significantly as a result of a planned extensive agricultural development in the basin. This additional pumpage may cause significant stress on the ground-water system, particularly on the environmentally sensitive Barka Slough. Expectations of the developer are that about 6,640 acre-feet per year of consumptive ground-water use will be required to irrigate 2,500 acres of vineyards and 1,200 acres of truck-farmed vegetables. This represents an increase in net basin pumpage of about 60 percent. The developer plans to obtain this water from 12 large-diameter irrigation wells in the Harris Canyon area. Analysis of the potential drawdowns in the vicinity of Barka Slough, by using the Theis nonequilibrium formula, indicates that drawdowns would average 6 feet after 10 years of pumping and would eventually exceed 10 feet. Because the artesian head in the aquifer that supplies the slough is generally less than 3 feet above land surface, these declines would probably mean that the wetlands of Barka Slough would disappear. The effects of this particular agricultural development would be in addition to any decline caused by other increases in pumpage in the basin. (Author).
Author: C. B. Hutchinson
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 58
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A nearly threefold increase in demand for water in the 154-square-mile San Antonio Creek valley in California during the period 1958-77 has increased the potential for overdraft on the ground-water basin. The hydrologic budget for this period showed a perennial yield of about 9,800 acre-feet per year and an annual ground-water discharge of about 11,400 acre-feet per year, comprising net pumpage of 7,100 acre-feet, phreatophyte evapotranspiration of 3,000 acre-feet, and base streamflow of 1 ,300 acre-feet. The base flow in San Antonio Creek could diminish to zero when net pumpage reaches 13,500 acre-feet per year. The environmentally sensitive marshland area of Barka Slough may then become stressed as water normally lost through evapotranspiration is captured by pumpage. The aquifer consists of alluvial valley fill that ranges in thickness from 0 to 3,500 feet. Ground water moves seaward from recharge areas along mountain fronts to a consolidated rock barrier about 5 miles east of the Pacific coast. Upwelling of ground water just east of the barrier has resulted in the 550-acre Barka Slough. Transmissivity of the aquifer ranges from 2,600 to 34,000 feet squared per day, with the lowest values occurring in the central part of the valley where the aquifer is thickest but probably finer grained. The salinity problems are increasing in the agricultural parts of the valley, which is east of the barrier. West of the barrier, stream and ground-water quality is poor, owing to seepage of saline water from the marine shale that underlies the area at shallow depths. A proposed basinwide monitoring program includes 17 water-level sites, 12 water-quality sampling sites, 3 streamflow measuring sites, and periodic infrared aerial photography of Barka Slough. A computer model of the ground-water flow system could be developed to assess the impact of various water-management alternatives.
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 776
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Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 732
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Author:
Publisher:
ISBN:
Category : Geological surveys
Languages : en
Pages : 260
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Author:
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ISBN:
Category :
Languages : en
Pages : 390
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 764
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Author: Carlos Madrid
Publisher:
ISBN:
Category : Water resources development
Languages : en
Pages : 166
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Author:
Publisher:
ISBN:
Category : California
Languages : en
Pages : 476
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