This digital dataset was created as part of a U.S. Geological Survey study, done in cooperation with the Sonoma County Water Agency and the City of Petaluma, to be used as the digital hydrogeologic input data for numerical simulation of the groundwater system of the Petaluma Valley Watershed, Sonoma County, California. Elevation, thickness, and extent of the hydrostratigraphic units define the geohydrologic layering of the digital framework model. The location of faults may be used to define the location of potential horizontal flow barriers in numerical simulation of the groundwater system. The intended uses of this dataset include, but are not limited to, natural resource modeling, mapping, and visualization applications. This digital dataset represents the three-dimensional hydrogeologic framework for the Petaluma Valley Watershed, Sonoma County, California. The data define the elevation, thickness, and extent of the principal hydrostratigraphic units of the region, and faults that cut these units. The digital data describe the following eight hydrostratigraphic units: Qal, Quaternary alluvial deposits; BM, Holocene Bay Mud deposits; Qmix, Quaternary mixed unit; WG, Wilson Grove Formation; PF, Petaluma Formation; SV, Sonoma Volcanics; TV, Tolay Volcanics; BSMT, Basement rocks. Most of the three-dimensional hydrogeologic framework data are contained within a single polygon feature class (HFM_300m_polys), which contains a mesh of polygons that represent model cells that have multiple attributes including X, Y, elevation, and thickness of each hydrostratigraphic unit. Faults are provided as a separate line features class (HFM_faults). Two additional ascii files contain the model output from 3D geologic framework and lithologic properties models for the Petaluma groundwater basin. An additional tabular data file contains specific capacity data calculated from well pumping tests.

This data release contains digital data generated by the U.S. Geological Survey under cooperative agreements with Sonoma County Water Agency and the California State Water Resources Control Board to characterize the three-dimensional hydrogeology of the Russian River Watershed, located in the northern part of the California Coast Ranges section of the Pacific Border province. This dataset contains geospatial data of a three-dimensional hydrogeologic framework model (3D HFM). The 3D HFM was constructed using methods from previously published reports. Sources of 3D HFM construction methods can be found in the metadata. The geospatial database contains a polygon feature class that is a 2-dimensional representation of the 3D HFM. The polygon feature class is a cellular array where each model cell has multiple attributes including XY location, and interpolated elevations and thicknesses of hydrogeologic units.

This data release contains digital data generated by the U.S. Geological Survey under cooperative agreements with Sonoma County Water Agency and the California State Water Resources Control Board to characterize the three-dimensional hydrogeology of the Russian River Watershed, located in the northern part of the California Coast Ranges section of the Pacific Border province. This dataset contains geospatial data of a three-dimensional hydrogeologic framework model (3D HFM). The 3D HFM was constructed using methods from previously published reports. Sources of 3D HFM construction methods can be found in the metadata. The geospatial database contains a polygon feature class that is a 2-dimensional representation of the 3D HFM. The polygon feature class is a cellular array where each model cell has multiple attributes including XY location, and interpolated elevations and thicknesses of hydrogeologic units.

This data release contains 3 land use shapefiles and 1 model grid shapefile for the Petaluma River Watershed in California. .

This data release contains digital data generated by the U.S. Geological Survey under cooperative agreements with Sonoma County Water Agency and the California State Water Resources Control Board to characterize the three-dimensional hydrogeology and water quality of the Russian River Watershed, located in the northern part of the California Coast Ranges section of the Pacific Border province. This dataset contains borehole lithologic and hydrologic data, geospatial data of a three-dimensional hydrogeologic framework model (3D HFM), and gravity data used to support development of the framework model. The borehole dataset is released as a series of .csv ascii files including (1) individual borehole location and construction information, (2) downhole lithologic interval data derived from well driller’s lithology logs and parsed to a series of textural descriptors, and (3) calculated specific capacity from driller’s pumping tests. In addition to the borehole data, a folder containing drillers logs used in the dataset, but not in California Department of Water Resources database of scanned driller’s logs is contained within the data release for reference. The geospatial database contains a polygon feature class that is a 2-dimensional representation of the 3D HFM. The polygon feature class is a cellular array where each model cell has multiple attributes including XY location, and interpolated elevations and thicknesses of hydrogeologic units. The 3D HFM was constructed using methods from previously published reports. Gravity data collected in support of 3D framework construction are present as a “child” item of the main data release. Sources of geologic data, 3D HFM construction methods, and additional gravity data can be found in the metadata.

This data release contains digital data generated by the U.S. Geological Survey under cooperative agreements with Sonoma County Water Agency and the California State Water Resources Control Board to characterize the three-dimensional hydrogeology and water quality of the Russian River Watershed, located in the northern part of the California Coast Ranges section of the Pacific Border province. This dataset contains borehole lithologic and hydrologic data, geospatial data of a three-dimensional hydrogeologic framework model (3D HFM), and gravity data used to support development of the framework model. The borehole dataset is released as a series of .csv ascii files including (1) individual borehole location and construction information, (2) downhole lithologic interval data derived from well driller’s lithology logs and parsed to a series of textural descriptors, and (3) calculated specific capacity from driller’s pumping tests. In addition to the borehole data, a folder containing drillers logs used in the dataset, but not in California Department of Water Resources database of scanned driller’s logs is contained within the data release for reference. The geospatial database contains a polygon feature class that is a 2-dimensional representation of the 3D HFM. The polygon feature class is a cellular array where each model cell has multiple attributes including XY location, and interpolated elevations and thicknesses of hydrogeologic units. The 3D HFM was constructed using methods from previously published reports. Gravity data collected in support of 3D framework construction are present as a “child” item of the main data release. Sources of geologic data, 3D HFM construction methods, and additional gravity data can be found in the metadata.

This data release contains digital data generated by the U.S. Geological Survey under cooperative agreements with San Bernardino Valley Municipal Water District to characterize the three-dimensional hydrogeology of the Yucaipa groundwater subbasin, located east of Los Angeles in southern California. This dataset contains borehole lithologic data, and geospatial data of a three-dimensional hydrogeologic framework model (HFM).The borehole dataset is released as a series of .csv ascii files including (1) individual borehole location, and (2) downhole lithologic interval data derived from well drillers’ lithology logs and parsed to a series of textural descriptors. The geospatial data include polygon and polyline feature classes that are a 2-dimensional representations of the HFM. The polygon feature class is a cellular array where each model cell has multiple attributes including XY location, and interpolated elevations and thicknesses of the hydrogeologic units. The polyline feature class is a series of lines that represent the extent and location of faults included in the HFM. Sources of geologic and hydrogeologic data can be found in the metadata.

This digital dataset represents the three-dimensional hydrogeologic framework for the Rio Grande Transboundary region of New Mexico, Texas, USA, and Northern Chihuahua, Mexico. The data define the elevation, thickness, extent, and character of the principal hydrostratigraphic units of the region, and faults and igneous intrusive dikes that cut these units. The digital data describe the following five hydrostratigraphic units: RC, river channel alluvium; three informal subdivisions of the Santa Fe Group (USF, Upper Santa Fe Group; MSF, Middle Santa Fe Group; LSF, Lower Santa Fe Group); and BSMT, which includes all pre-Santa Fe Group rocks (basement). All units except BSMT (RC, USF, MSF, LSF) are split into two subunits. In each case, the designation 1 (e.g., USF1) indicates the UPPER subunit and the designation 2 (e.g., USF2) indicates the LOWER subunit. Most of the three-dimensional hydrogeologic framework data are contained within a single polygon feature class Frmwk_cells, which contains a mesh of polygons that represent model cells that have multiple attributes including X, Y, elevation and thickness of each hydrostratigraphic unit or subunit, and codes that represent sedimentary facies for each hydrostratigraphic subunit. The spatial extent of RC, USF, MSF, and LSF are provided as separate polygon feature classes. Faults and igneous intrusive dikes are provided as separate line features classes. This digital dataset was created as part of a U.S. Geological Survey study, done in cooperation with the U.S. Bureau of Reclamation, to be used as the digital hydrogeologic input data for numerical simulation of the groundwater system of the Rio Grande transboundary region of New Mexico, Texas, USA and Northern Chihuahua, Mexico. These data are intended as the digital hydrogeologic input for numerical simulation of the groundwater system. Elevation, thickness, and extent of the hydrostratigraphic units define the geohydrologic layering of the digital framework model. Codes that represent sedimentary facies may be used as a lithologic basis for the distribution of hydraulic properties within each hydrostratigraphic unit. The location of faults and igneous intrusive dikes may be used to define the location of potential horizontal flow barriers in numerical simulation of the groundwater system.

This digital dataset defines the model-grid and hydraulic-property data arrays of the Multiplier (MULT) Package used in the transient hydrologic model of the Central Valley flow system. The MULT package defines multiplier arrays for calculation of model-layer characteristics from parameter values. The Central Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code, MODFLOW-FMP (Schmid and others, 2006). This simulation is referred to here as the Central Valley Hydrologic Model (CVHM) (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003. The total active modeled area is 20,334 square-miles on a finite-difference grid comprising 441 rows and 98 columns. Slightly less than 50 percent of the cells are active. It has a uniform horizontal discretization of 1x1 square mile and is oriented parallel to the valley axis, 34 degrees west of north (Faunt, 2009). The MULT Package includes the percentage of coarse-grained deposits in each of the 10 model layers, specific yield, and the altitudes of the tops of model layers 1-4. In order to better characterize the aquifer-system deposits, lithologic data from approximately 8,500 drillers' logs of boreholes ranging in depth from 12 to 3,000 feet below land surface were compiled and analyzed. The percentage of coarse-grained sediment, or texture, then was computed for each 50-foot depth interval of the drillers' logs. A 3-dimensional texture model was developed by interpolating the percentage of coarse-grained deposits onto a 1-mile spatial grid at 50-foot depth intervals from land surface to 2,800 feet below land surface. The specific yield data were extrapolated from the percentage of coarse-grained deposits in model layer 1. The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program (see "Foreword", Chapter A, page iii, for details).

This digital dataset defines the model-grid and hydraulic-property data arrays of the Multiplier (MULT) Package used in the transient hydrologic model of the Central Valley flow system. The MULT package defines multiplier arrays for calculation of model-layer characteristics from parameter values. The Central Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code, MODFLOW-FMP (Schmid and others, 2006). This simulation is referred to here as the Central Valley Hydrologic Model (CVHM) (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003. The total active modeled area is 20,334 square-miles on a finite-difference grid comprising 441 rows and 98 columns. Slightly less than 50 percent of the cells are active. It has a uniform horizontal discretization of 1x1 square mile and is oriented parallel to the valley axis, 34 degrees west of north (Faunt, 2009). The MULT Package includes the percentage of coarse-grained deposits in each of the 10 model layers, specific yield, and the altitudes of the tops of model layers 1-4. In order to better characterize the aquifer-system deposits, lithologic data from approximately 8,500 drillers' logs of boreholes ranging in depth from 12 to 3,000 feet below land surface were compiled and analyzed. The percentage of coarse-grained sediment, or texture, then was computed for each 50-foot depth interval of the drillers' logs. A 3-dimensional texture model was developed by interpolating the percentage of coarse-grained deposits onto a 1-mile spatial grid at 50-foot depth intervals from land surface to 2,800 feet below land surface. The specific yield data were extrapolated from the percentage of coarse-grained deposits in model layer 1. The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program (see "Foreword", Chapter A, page iii, for details).