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Data release of Three-Dimensional Hydrogeologic Framework Model of the Petaluma Valley Watershed, Sonoma County, California

Metadata Updated: October 28, 2023

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.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023
Publisher U.S. Geological Survey
Identifier USGS:5b68bea9e4b006a11f75b8eb
Data Last Modified 20200820
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 1dee49ee-88bc-42b4-a6c4-70c1d3de6beb
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -122.8276,38.0219,-122.3858,38.3809
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash b426f52471cd63f70053645dad05cb77a6fc16b18cce6e08621cb6f2a8ef3f9a
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -122.8276, 38.0219, -122.8276, 38.3809, -122.3858, 38.3809, -122.3858, 38.0219, -122.8276, 38.0219}

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