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Research about San Bernardino County, California

Source-linked reports with geographic coverage including San Bernardino County, California.

86 records · Page 5Linked to original sources
USGS1978

Well-response model of the confined area, Bunker Hill ground-water basin, San Bernardino County, California

The Bunker Hill ground-water basin, in the vicinity of San Bernardino, Calif., is being artificially recharged with imported water. Current and future artificial recharge of the basin may cause the potentiometric surface in an area of confined ground water to rise above land surface and water to flow from uncapped and unplugged wells. This could cause damage to structures where the soil becomes waterlogged and where buried wells begin to flow beneath the structures. A well-response model was used to generate a series of water-level hydrographs representing the response of the ground-water basin to six possible combinations of conditions for each well; one pumping rate, two artificial-recharge rate, and three natural-recharge rates. Inflow to the ground-water basin exceeds outflow for all tested combinations. According to model predictions, the accumulation of stored ground water resulting from the excess of inflow is sufficient to cause the water level in the selected wells to rise above land surface for all but one of the combinations of conditions tested. Water levels in wells are predicted to rise above the land surface as early as 1981 for the combination with the greatest excess of inflow. (Woodard-USGS)

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USGS1975

Artificial recharge in the upper Santa Ana River area, San Bernardino County, California

The San Bernardino Valley Municipal Water District began receiving its initial entitlement of 46,000 acre-feet (5.7 x 107 cubic metres) per year of imported northern California water in December 1972. By 1990, the district will be receiving 102,000 acre-feet (1.3 x 108 cubic metres) per year. Plans are to distribute this imported water for artificial recharge to the local ground-water system. The upper Santa Ana River area is well suited for artificial recharge because it is largely underlain by permeable river-channel deposits. Some sandy clay, silt, and cemented sand and gravel layers occur that may locally retard downward percolation of recharge water. However, test drilling indicates none of these is extensive enough to impede recharge in the spreading grounds. Analyses of ground-water movement during current water-spreading operations, test-drilling data, and application of Baumann's (1965) equation for calculating the theoretical size of the recharge mound indicate that (1) barriers to ground-water movement are not evident in the river-channel deposits, (2) depth to the basement complex is less in the area of the eastern spreading basins than in the western basins, (3) the spreading grounds would be capable of accepting a combined total of as much as 80,000 acre-feet (9.9 x 107 cubic metres) per year, and (4) the water being recharged should move through the part of the aquifer composed of river-channel deposits toward the areas of pumpage.

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USGS1974

Flood-hazard study, 100-year stage for Baldwin Lake, San Bernardino County, California

Shoreline features that represent former high-water stages on Baldwin Lake are found at 10 different altitudes that range from 6,700 to 6,713 feet (2,042 to 2,046 metres). Stage frequencies were assigned to the stages, but the date of formation of the features could be determined only for the most recent shorelines. Stage-frequency analysis involving 39 years of observed annual maximum stage record of the lake and an additional 40 years of synthetic record of annual maximum stage, based on a precipitation-stage relation, resulted in an estimate of 6,710.7 feet (2,045 metres) for lake altitude corresponding to a 100-year flood.

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USGS1974

Oak Glen water-resources development study using modeling techniques, San Bernardino County, California

Hydrologic, digital-model, and economic analyses were made to determine the most efficient balance of conjunctive use of local ground water and surface water--specifically, whether additional ground-water supplies can be developed in the Oak Glen study area, San Bernardino County, Calif., for local use and also for export to the adjacent Yucaipa area, and what will be the effects of imported water available in 1980. The hydrologic analysis showed that transmissivity values of the aquifer in the Oak Glen study area ranged from 1,000 to 6,750 gallons per day per foot or their equivalent 134 to 902 feet squared per day (12 to 84 metres squared per day) and that net annual recharge in the area was about 1,940 acre-feet (2.39 cubic hectometres) per year. The volume of ground water in storage in 1970 was about 86,000 acre-feet (106 cubic hectometres). The digital-model analysis included building and verifying a steady-state and a non-steady-state model. The steady-state model was considered to be verified when the model-generated water levels approximated the measured 1949 water levels, which were assumed to represent steady-state water-level conditions. The non-steady-state model was verified for 1949-70, and the model satisfactorily reproduced the measured water-level changes for the study area during that period. Water-level changes in the ground-water basin were predicted from 1971 to 1980 using as representative average annual pumpage that from 1966 to 1970 and 1971. The model also predicted water-level changes from 1971 to 1980 using the maximum pumpage capacities of the wells under recharge conditions for average, wet, and dry periods. The predicted water-level changes in the Oak Glen study area were used to calculate the average costs of pumping water for 1980. The comparable average costs of importing water from an alternative supply and the capital costs of well construction were also determined. The economic evaluation suggests the following: (1) Increase ground-water pumping for local use, (2) reduce well-water import to the lower parts of the Oak Glen study area from adjacent areas to the west, (3) short term prior to 1980 overdevelopment appears to be feasible with export to Yucaipa, and (4) tunnel development or new shallow wells at the higher altitudes could help alleviate the water problem.

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USGS1971

Water wells in the Harper, Superior, and Cuddeback Valley areas, San Bernardino County, California

This bulletin is one of a series on water wells and springs in southern California desert areas. The series is prepared by the U. S. Geological Survey and published by the California Department of Water Resources. Each bulletin locates water wells and springs in a part of the southern California desert regions; describes well depth and yield, water use and level on dates observed; names the well owner; provides pumping data, including depths, rates, static water levels, drawdowns, and specific capacities; and lithologic data from drillers' well logs.

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USGS1956

Geology and petrology of the Lava Mountains, San Bernardino County, California

The Lava Mountains are a range of low mountains along the northern edge of the Mojave Desert, California. The pre-Tertiary rocks consist of a few swell pendants of metamorphic rocks in Atolia quartz monzonite. Overlying these are small patches of volcanic and sedimentary rocks, probably Tertiary, which project into the later formations. The major sedimentary unit is the middle Pliocene 3edrock Spring formation; it consists chiefly of arkosic sandstone and conglomerate with lesser amounts of siltstone and brecciated volcanic rocks. Overlying this formation are two late Pliocene formations, the Almond Mountain volcanic ant Klinker Mountain volcanics in the eastern and western parts of the area, respectively. Small areas of other late Pliocene(?) volcanic rocks are locally present. Overlying these are flaws of the Lava Mountains andesite of very late Pliocene age. The Pleistocene(?) Christmas Canyon formation is restricted to the eastern half of the area. A few small dikes of basalt cut this formation. Quaternary gravels, alluvium, and travertine are the youngest deposits.

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USGS1952

Geologic map of bastnaesite deposits, Birthday claims, San Bernardino County, California

In April 1949 a deposit containing considerable quantities of the rare mineral bastnaesite - the fluorocarbonate of cerium, lanthanum, and other rare earths - was discovered near Mountain Pass, San Bernardino County, Calif. Small quantities of bastnaesite have been found in several places in the United States, but this area is the first that offers promise of being a commercial source of cerium, lanthanum, and other rare earths.

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USGS1951

Geologic map of the baritic carbonate body near Mountain Pass, San Bernardino County, California

A geologic map of an important deposit of rare earth metals studied recently by Geological Survey geologists near Mountain Pass, California has been completed Secretary of the Interior Oscar L. Chapman announced today. The discovery of this deposit was announced on January 16, and because of the great interest that has been shown in the deposit, the map is being made available for public inspection immediately, Secretary Chapman explained. The deposit covered by this map is in San Bernardino County, California near where prospectors made the original discovery on the Birthday claims in 1949. Subsequent studies by the Geological Survey have shown that an area roughly 6 miles long and 2 miles wide, extending southeast from the original discovery, contains a number of other rare carth-bearing deposits, including the large ore body covered by this map. This ore body is made up largely of a carbonate mineral and barite, but contains significant quantities of the rare earth mineral, bastnasite as well. It is exposed over an area 2,400 feet long and 400 feet wide.

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USGS1947

Geology of San Antonio Canyon, California, in relation to ground-water storage

At least two periods of relative stability in the history of the erosion of San Antonio Canyon are indicated by the bench-like features produced by the laterally cutting stream and by the remnants of older alluvium left by the stream when it was cutting at these higher levels. In addition, a much older and probably mature surface is suggested by certain features of the higher ridges and the near-summits of Ontario and San Antonio Mountains.

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